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341 results on '"Jean-Louis, Doualan"'

1. Dual-wavelength-pumping of mid-infrared Tm:YLF laser at 2.3 µm: demonstration of pump seeding and recycling processes

Author

Hippolyte Dupont, Lauren Guillemot, Pavel Loiko, Alain Braud, Jean-Louis Doualan, Patrice Camy, Patrick Georges, Frédéric Druon, Laboratoire Charles Fabry / Lasers, Laboratoire Charles Fabry (LCF), Institut d'Optique Graduate School (IOGS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Atomic and Molecular Physics, and Optics
Abstract

Upconversion pumping of thulium lasers emitting around 2.3 µm (the 3H4 → 3H5 transition) has recently attracted a lot of attention as it is compatible with the mature Yb-laser technology. To explore this possibility, we built a mid-infrared Tm:LiYF4 laser pumped by an Yb:CaF2 laser at 1.05 µm delivering an output power of 110 mW at 2.31 µm for a maximum incident pump power of 2.0 W. A strong absorption issue appeared in the Tm laser: the slope efficiency vs. the incident pump power was 7.6% while that vs. the absorbed pump power reached 29%. To overcome this issue, a dual-wavelength pumping at 0.78 µm and 1.05 µm was explored (combining both the direct and upconversion pumping schemes). The reciprocal interplay between the two pumps was studied to evaluate their benefits in terms of the pump absorption and laser efficiency. We observed an interesting decrease of the laser threshold for upconversion pumping when adding a small fraction of the direct pump revealing a seeding effect for the excited-state absorption from the metastable 3F4 level. A recycling process of this manifold by excited-state absorption in the 3F4 → 3F2,3 loop was also observed. The pump absorption seeding is a viable route for the development of low-threshold upconversion pumped thulium lasers.

Published
2022

4. InGaN-LD-Pumped ${\rm Pr}^{3+}$: ${\rm LiYF}_{4}$ Continuous-Wave Laser at 915 nm

Author

Biao Qu, Bin Xu, Yongjie Cheng, Saiyu Luo, Huiying Xu, Yikun Bu, Patrice Camy, Jean-Louis Doualan, Richard Moncorge, and Zhiping Cai

Subjects
Solid state lasers, Diode-pumped lasers, infrared lasers, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
Abstract

We demonstrate the first InGaN-LD-pumped room temperature and continuous-wave laser operation of a Pr3+: LiYF4 crystal at 915 nm. A maximum output power up to 78 mW with a laser slope efficiency of about 17% is obtained. The round-trip optical losses are estimated to be about 0.45%, and the M2 beam quality factors measured in x and y dimensions are about 1.07 and 1.04, respectively.

Published
2014
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10. From Selenium- to Tellurium-Based Glass Optical Fibers for Infrared Spectroscopies

Author

Jacques Lucas, Bruno Bureau, Johann Troles, Jean-Louis Doualan, Virginie Nazabal, Catherine Boussard-Plédel, Radwan Chahal, and Shuo Cui

Subjects
selenide glass, telluride glass, optical fiber, infrared spectroscopy, Organic chemistry, QD241-441
Abstract

Chalcogenide glasses are based on sulfur, selenium and tellurium elements, and have been studied for several decades regarding different applications. Among them, selenide glasses exhibit excellent infrared transmission in the 1 to 15 µm region. Due to their good thermo-mechanical properties, these glasses could be easily shaped into optical devices such as lenses and optical fibers. During the past decade of research, selenide glass fibers have been proved to be suitable for infrared sensing in an original spectroscopic method named Fiber Evanescent Wave Spectroscopy (FEWS). FEWS has provided very nice and promising results, for example for medical diagnosis. Then, some sophisticated fibers, also based on selenide glasses, were developed: rare-earth doped fibers and microstructured fibers. In parallel, the study of telluride glasses, which can have transmission up to 28 µm due to its atom heaviness, has been intensified thanks to the DARWIN mission led by the European Space Agency (ESA). The development of telluride glass fiber enables a successful observation of CO2 absorption band located around 15 µm. In this paper we review recent results obtained in the Glass and Ceramics Laboratory at Rennes on the development of selenide to telluride glass optical fibers, and their use for spectroscopy from the mid to the far infrared ranges.

Published
2013
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12. Cryogenic Laser Operation of Ytterbium-Doped CaF2, SrF2 and BaF2 Crystals

Author

Pavel Loiko, Jean-Louis Doualan, Abdelmjid Benayad, Alain Braud, and Patrice Camy

Abstract

We report on a comparative study of low-temperature spectroscopy and cryogenic (77-K) free-running and tunable laser operation of three Yb3+-doped fluorite-type crystals, CaF2, SrF2 and BaF2. 10-W diode-pumped cryogenic Yb:CaF2 laser is also developed.

Published
2022

13. Spectroscopy and Mid-Infrared Laser Operation of 'Mixed' Sesquioxide Ceramics Er:(Y,Sc)2O3

Author

Liza Basyrova, Pavel Loiko, Roman Maksimov, Vladislav Shitov, Jean-Louis Doualan, Alain Braud, Ammar Hideur, Bruno Viana, and Patrice Camy

Abstract

Transparent ceramics based on “mixed” sesquioxides, Er:(Y,Sc)2O3, are fabricated by vacuum sintering at 1750 °C from laser-ablated nanoparticles. They exhibit inhomogeneously broadened spectral bands. A continuous-wave Er:(Y,Sc)2O3 ceramic laser generates 312 mW at 2716 nm.

Published
2022

14. Er:KY

Author

Liza, Basyrova, Pavel, Loiko, Jean-Louis, Doualan, Abdelmjid, Benayad, Alain, Braud, Christophe, Labbé, and Patrice, Camy

Abstract

We report on the mid-infrared laser operation of a cubic 15 at.%

Published
2021

15. Spectroscopy of Tm3+-doped CaF2 waveguiding thin films grown by Liquid Phase Epitaxy

Author

Mikhail A. Baranov, Jean-Louis Doualan, Gozhalskii Daniil, Patrice Camy, Elena Dunina, Abdelmjid Benayad, Alexey Kornienko, Liza Basyrova, Pavel Loiko, Gurvan Brasse, Alain Braud, Cesare Meroni, Optique, Matériaux et Laser (OML), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), ANR-19-CE08-0028,SPLENDID2,Lasers solides et amplificateurs à impulsions courtes au-delà de 2 µm(2019), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Biophysics, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, Epitaxy, 01 natural sciences, Biochemistry, Ion, Thin film, Spectroscopy, ComputingMilieux_MISCELLANEOUS, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Doping, General Chemistry, Spectral bands, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, chemistry, Fluorine, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Luminescence
Abstract

Thulium-doped calcium fluoride (Tm:CaF2) single-crystalline films are grown on (100)-oriented undoped bulk CaF2 substrates by Liquid Phase Epitaxy (LPE) using LiF as a solvent. Their spectroscopic properties are studied in details. For ~2 at.% Tm-doped films, the active ions are predominantly isolated and are located in oxygen-assisted trigonal sites, C3v(T2). With increasing the Tm doping level, ion clustering is promoted but it is slowed down as compared to bulk crystals. For ~6 at.% Tm-doped films, the majority of active ions form clusters resulting in a “glassy-like” spectroscopic behavior (smooth and broad spectral bands). For such layers, the maximum stimulated-emission cross-section for the 3F4 → 3H6 transition is 0.14 × 10−20 cm2 at 1856 nm, the luminescence lifetime of the 3F4 state is 21.70 ms and the emission bandwidth exceeds 180 nm. The transition probabilities of Tm3+ ions are determined using the Judd-Ofelt theory. The waveguiding properties of the Tm:CaF2 films are confirmed. Highly-doped Tm:CaF2 epitaxial films are promising for waveguide lasers at ~2 μm.

Published
2021

16. Liquid phase epitaxy growth and structural characterization of highly-doped Er3+:LiYF4 thin films

Author

Liza Basyrova, Gurvan Brasse, Pavel Loiko, Clara Grygiel, Rosa Maria Solé, Magdalena Aguiló, Francesc Díaz, Xavier Mateos, Abdelmjid Benayad, Jean-Louis Doualan, and Patrice Camy

Subjects
Inorganic Chemistry, Organic Chemistry, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Atomic and Molecular Physics, and Optics, Spectroscopy, Electronic, Optical and Magnetic Materials
Published
2022

17. Liquid Phase Epitaxy growth, structure and spectroscopy of highly-doped 20 at.% Yb3+:LiYF4 thin films

Author

Pavel Loiko, Abdelmjid Benayad, Jean-Louis Doualan, Patrice Camy, Gurvan Brasse, Alain Braud, Andrey V. Veniaminov, Franck Lemarie, Viktor Zakharov, Clara Grygiel, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Optique, Matériaux et Laser (OML), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and ANR-19-CE08-0028,SPLENDID2,Lasers solides et amplificateurs à impulsions courtes au-delà de 2 µm(2019)

Subjects
Materials science, Biophysics, Analytical chemistry, 02 engineering and technology, 010402 general chemistry, Epitaxy, 01 natural sciences, Biochemistry, Ion, chemistry.chemical_compound, symbols.namesake, Thin film, Supercooling, Spectroscopy, ComputingMilieux_MISCELLANEOUS, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Doping, Lithium fluoride, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, chemistry, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Raman spectroscopy
Abstract

Highly doped (20 at.%) Yb3+:LiYF4 single-crystalline thin films are grown on (001)-oriented bulk undoped LiYF4 substrates by Liquid Phase Epitaxy using lithium fluoride (LiF) as a solvent. The growth temperature lies around 741 °C (0.5–1 °C supercooling) and the growth rate is 1.8–2.6 μm/min. The single-crystalline nature of the films is confirmed by X-ray diffraction and polarized Raman spectroscopy. The film morphology is studied and discussed. The polarized spectroscopic properties of Yb3+ ions are reported, indicating a stimulated-emission cross-section of 0.88 × 10−20 cm2 at 993.9 nm in π-polarization and a radiation trapping free lifetime of the 2F5/2 state of 2.00 ms indicating weak concentration-quenching. The crystal-field splitting of Yb3+ multiplets is resolved at 12 K. Highly-doped Yb3+:LiYF4/LiYF4 homoepitaxies are promising for waveguide and thin-disk lasers at ~1 μm.

Published
2021

18. Transparent Gahnite Ceramics Cr3+:ZnAl2O4 – Novel Red-Emitting Material

Author

Pavel Loiko, Stanislav Balabanov, Jean-Louis Doualan, Liza Basyrova, Ivan Kuznetsov, Alexander Belyaev, Ivan Mukhin, Patrice Camy, Optique, Matériaux et Laser (OML), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Absorption spectroscopy, Doping, Spinel, Analytical chemistry, chemistry.chemical_element, engineering.material, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, Laser, law.invention, Chromium, chemistry, law, visual_art, X-ray crystallography, visual_art.visual_art_medium, engineering, Stimulated emission, Ceramic, ComputingMilieux_MISCELLANEOUS
Abstract

Trivalent chromium ions (Cr 3+ ) located in octahedral (O h ) sites in crystals such as Alexandrite (BeAl 2 O 4 ) are attractive because of large emission bandwidth enabling the development of broadly tunable and mode-locked [1] lasers. It is interesting to search for other promising laser host materials for Cr 3+ doping. Gahnite (ZnAl 2 O 4 ) belonging to the spinel family is known for its good thermal and optical properties and it is very suitable for doping with transition-metal ions such as Ni 2+ or Co 2+ [2] . Recently, transparent gahnite ceramics were fabricated [2] . In the present work, we report on the first transparent Cr 3+ -doped gahnite ceramics exhibiting intense and broadband emission in the red spectral range.

Published
2021

19. Passively Q-switched Diode-Pumped Thulium Laser at 2305 nm

Author

Esrom Kifle, Jean-Louis Doualan, Ammar Hideur, Pavel Loiko, Patrice Camy, Alain Braud, Florent Starecki, Lauren Guillemot, Optique, Matériaux et Laser (OML), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Materials science, business.industry, Infrared, Slope efficiency, chemistry.chemical_element, Laser, law.invention, Semiconductor laser theory, Thulium, Mode-locking, chemistry, law, Femtosecond, Optoelectronics, business, ComputingMilieux_MISCELLANEOUS, Diode
Abstract

In recent years, there is a growing interest to thulium (Tm) lasers operating at ~2.3 µm according to the 3 H 4 → 3 H 5 transition [1] , [2] . Such short-wavelength infrared emission is of practical importance for sensing of atmospheric species (HF, CO, CH 4 and H 2 CO). Guillemot et al . reported on a continuous-wave (CW) Tm:KY 3 F 10 laser delivering 0.84 W at 2331-2346 nm with a slope efficiency of 53.8% [1] . Canbaz et al . developed a Kerr-lens mode-locked Tm:LiYF 4 laser emitting femtosecond (514 fs) pulses at 2303 nm [2] . However, so far, little attention was paid to passively Q-switched (PQS) Tm lasers at ~2.3 μm. In the present work, we report on a diode-pumped PQS Tm:LiYF 4 laser operating on the 3 H 4 → 3 H 5 transition and delivering stable pulsed output without any colasing at ~1.9 μm.

Published
2021

20. Mid-Infrared Laser Emissions of Tm 3+ -doped Garnets: The Case Study of Disordered Tm:CNGG Crystal

Author

Zhongben Pan, Jean-Louis Doualan, Lauren Guillemot, Pavel Loiko, Patrice Camy, Alain Braud, Optique, Matériaux et Laser (OML), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Doping, Niobium, Analytical chemistry, chemistry.chemical_element, Ion, Crystal, Thulium, chemistry, Gallium, Luminescence, Spectroscopy, ComputingMilieux_MISCELLANEOUS
Abstract

Recently, disordered garnets such as CNGG (calcium niobium gallium garnet) doped with Tm 3+ and codoped with Tm 3+ and Ho 3+ ions have attracted a lot of attention for generation of ultrashort pulses at ~2 µm [1] . Pan et al . reported on a Tm oscillator operating on the 3 F 4 → 3 H 6 transition and delivering 84 fs pulses at 2018 nm (emission bandwidth: >50 nm) and demonstrated continuous wavelength tuning between 1879-2086 nm [1] . It is interesting to extend the emission range of such crystals further into mid-IR. It can be done by exploiting either (i) vibronic emissions relying on electron-phonon-coupling or (ii) less common electronic 3 H 4 → 3 H 5 transition [2] .

Published
2021

21. Excited-state absorption in thulium-doped materials in the near-infrared

Author

Lauren Guillemot, Pavel Loiko, Jean-Louis Doualan, Alain Braud, Patrice Camy, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Optique, Matériaux et Laser (OML), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and ANR-19-CE08-0028,SPLENDID2,Lasers solides et amplificateurs à impulsions courtes au-delà de 2 µm(2019)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Atomic and Molecular Physics, and Optics
Abstract

Excited-state absorption (ESA) is a key process for upconversion pumping schemes of thulium (Tm3+) doped laser materials. We have systematically studied two ESA transitions in the near-infrared spectral range, namely 3F4 → 3F2,3 (at ∼1 µm) and 3F4 → 3H4 (at ∼1.5 µm), in various Tm3+-doped fluoride (ZBLAN glass, cubic KY3F10 and CaF2, tetragonal LiYF4 and LiLuF4, monoclinic BaY2F8 crystals) and oxide (cubic Y3Al5O12, orthorhombic YAlO3 crystals) laser materials, using a pump-probe method with a polarized light. An approach to calculate the constants of energy-transfer upconversion (ETU) is also presented.

Published
2022

22. Optical and structural properties of Mn-doped magnesium titanates fabricated with excess MgO

Author

Larysa Khomenkova, T. Stara, Jean-Louis Doualan, V. P. Kladko, Julien Cardin, O. Gudymenko, K. Kozoriz, Tetyana Kryshtab, Valentyna Nosenko, Igor Vorona, Christophe Labbé, L. V. Borkovska, V.E. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine (NASU), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Nanomatériaux, Ions et Métamatériaux pour la Photonique (NIMPH), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Escuela Superior de Fisica y Matematicas [Mexico] (ESFM), Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN)

Subjects
Photoluminescence, Materials science, Diffuse reflectance infrared fourier transform, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Crystal structure, ceramics, 010402 general chemistry, 01 natural sciences, law.invention, [SPI.MAT]Engineering Sciences [physics]/Materials, Crystal, [PHYS.PHYS.PHYS-COMP-PH]Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph], law, Materials Chemistry, luminescence, point defects, General Materials Science, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Electron paramagnetic resonance, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Magnesium, oxide materials, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, X-ray diffraction, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, electron paramagnetic resonance, chemistry, Mechanics of Materials, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Absorption (chemistry), 0210 nano-technology, Stoichiometry
Abstract

International audience; Optical and structural properties of ceramics based on Mn-doped magnesium titanates synthesized by sintering in air at 1200 °C of MgO and TiO$_2$ powders of different molar ratio ranging from MgTiO$_3$ to Mg$_2$TiO$_4$ stoichiometric compositions were studied. The influence of excess MgO on Mn incorporation in crystal lattice of MgTiO$_3$ was also investigated. The Mn$^{4+}$ ions substituted Ti$^{4+}$ sites were controlled by the photoluminescence (PL) and diffuse reflectance spectroscopy, and the Mn$^{2+}$ ions on Mg$^{2+}$ sites were monitored by electron paramagnetic resonance (EPR). The ceramics produced using equimolar ratio of MgO and TiO$_2$ composed of a major MgTiO$_3$ and a minor MgTi$_2$O$_5$ crystal phases, and those made with excess MgO contained MgTiO$_3$ and Mg$_2$TiO$_4$ phases in different proportions. The EPR study showed that Mn incorporated in MgTiO$_3$ synthesized under 1:1 molar ratio as Mn$^{2+}$ ion mainly. This agreed with low intensity of Mn$^{4+}$ red PL ascribed to low concentration of Mn$^{4+}$ centers and partial absorption of the UV excitation light by the MgTi$_2$O$_5$ phase. The Mn-doped MgTiO$_3$ synthesized with excess MgO of 19 and 50 mol.% showed increased Mn$^{4+}$ red PL by a factor 30-50, enhanced Mn$^{4+}$ optical absorption and more than ten times decreased Mn$^{2+}$ EPR signal. The Mg$_2$TiO$_4$ phase was found to be under compressive strains attributed to the presence of Mg vacancies and demonstrated Mn$^{4+}$ red PL with modified spectrum shape and decay behavior. It is concluded that in MgTiO$_3$ the excess MgO facilitates the incorporation of Mn onto Ti$^{4+}$ site and can be used for the increasing of Mn$^{4+}$ PL intensity.

Published
2021

23. Tm3+ codoping for mid-infrared laser applications of Dy3+ doped CaF2 crystals

Author

Alain Braud, Jean-Louis Doualan, Gurvan Brasse, Abdelmjid Benayad, Rémi Soulard, Patrice Camy, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux (ARTEMIS), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Optique, Matériaux et Laser (OML), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université Nice Sophia Antipolis (1965 - 2019) (UNS), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN)

Subjects
Materials science, Biophysics, Analytical chemistry, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Biochemistry, Waveguide (optics), law.invention, Ion, law, Mid infrared laser, Absorption (electromagnetic radiation), Saturation (magnetic), [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Doping, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Excitation
Abstract

International audience; We report here on a spectroscopic study of Dy3+-doped and Tm3+-Dy3+ doped CaF2 as promising candidates to develop crystalline waveguide laser sources around 3 μm. The advantages of Tm3+ ions as sensitizers to improve the excitation of Dy3+ ions in CaF2 is demonstrated: an energy transfer efficiency from Tm3+ to Dy3+ ions of 99.6% has been reached for Dy3+ concentration as high as 2 at.%, by considering a Tm3+ ratio set at 5 at.%. Moreover, the behavior of such doped crystals in a laser waveguide configuration has been modeled and the modeling results show that it seems possible to achieve promising laser perspectives around 3 μm, with laser thresholds in the watt level for singly doped Dy3+:CaF2 and around 0.2–0.3 W for codoped Tm3+-Dy3+:CaF2, presenting both laser efficiencies in the order of 30%. Finally, the saturation of the absorption which is observed in the modeling for such codoped Tm3+-Dy3+:CaF2 waveguide at Dy3+ concentration below 1% is discussed and its origin is explained.

Published
2021

24. Disordered Tm3+,Ho3+-codoped CNGG garnet crystal: Towards efficient laser materials for ultrashort pulse generation at ∼2 μm

Author

Magdalena Aguiló, Francesc Díaz, Xavier Mateos, Hualei Yuan, Patrice Camy, Pavel Loiko, Jean-Louis Doualan, Huaqiang Cai, Elena Dunina, Uwe Griebner, Alexey Kornienko, Sami Slimi, Yicheng Wang, Rosa Maria Solé, Ezzedine Ben Salem, Josep Maria Serres, Valentin Petrov, Tang Kaiyang, Zhongben Pan, Xiaojun Dai, Weidong Chen, Liudmila Fomicheva, Yongguang Zhao, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, law.invention, Crystal, law, Materials Chemistry, Gallium, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Spectroscopy, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Mechanical Engineering, Slope efficiency, Metals and Alloys, 021001 nanoscience & nanotechnology, Laser, 0104 chemical sciences, chemistry, Mechanics of Materials, Femtosecond, Continuous wave, Atomic physics, 0210 nano-technology, Ultrashort pulse
Abstract

We report on the growth, structure refinement, optical spectroscopy, continuous wave and femtosecond mode-locked laser operation of a Tm3+,Ho3+-codoped disordered calcium niobium gallium garnet (CNGG) crystal. The 2.64 at.% Tm, 0.55 at.% Ho:CNGG is grown by the Czochralski method. Its cubic structure, sp. gr. I a 3 ¯ d - O10h, a = 12.4952(1) A, is refined by the Rietveld method revealing a random distribution of Ga3+ and Nb5+ cations over octahedral and tetrahedral sites. The Ho3+ transition probabilities are determined within the Judd-Ofelt theory accounting for an intermediate configuration interaction (ICI). For the 5I7 → 5I8 Ho3+ transition, the maximum stimulated-emission cross-section σSE is 0.47 × 10−20 cm2 at 2080.7 nm. The gain bandwidth of Tm,Ho:CNGG at ∼2 μm is > 150 nm and the thermal equilibrium decay time - 6.80 ms. The Tm3+ ↔ Ho3+ energy transfer parameters are determined. A diode-pumped Tm,Ho:CNGG microchip laser generated 413 mW at 2088.4 nm with a slope efficiency of 15.9%. A continuous wavelength tuning between 1940.3 and 2144.6 nm is demonstrated. Ultrashort pulses as short as 73 fs are achieved at 2061 nm from a Tm,Ho:CNGG laser mode-locked by a GaSb semiconductor saturable absorber mirror at a repetition rate of 89.3 MHz.

Published
2021

25. Highly efficient 2.3 µm thulium lasers based on a high-phonon-energy crystal: Evidence of vibronic-assisted emissions

Author

Pavel Loiko, Alain Braud, Florent Starecki, Jean-Louis Doualan, Xavier Mateos, Valentin Petrov, Francesc Díaz, Magdalena Aguiló, Patrice Camy, Lauren Guillemot, Esrom Kifle, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Optique, Matériaux et Laser (OML), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Física i Cristallografia de Materials i Nanomaterials (FiCMA-FiCNA), UniversitatRovira i Virgili (URV), Max-Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI), ANR-19-CE08-0028,SPLENDID2,Lasers solides et amplificateurs à impulsions courtes au-delà de 2 µm(2019), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN)

Subjects
Materials science, Infrared, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, law.invention, 010309 optics, Crystal, 020210 optoelectronics & photonics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, ComputingMilieux_MISCELLANEOUS, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Slope efficiency, Statistical and Nonlinear Physics, Laser, Atomic and Molecular Physics, and Optics, Photon upconversion, Thulium, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, Quantum efficiency, business, Monoclinic crystal system
Abstract

We report on highly efficient and power-scalable laser operation in a thulium-doped high-phonon-energy crystal [monoclinic double tungstate, K L u ( W O 4 ) 2 ] on the 3 H 4 → 3 H 5 T m 3 + transition giving rise to the short-wave infrared emission at ∼ 2.3 µ m . A 3 at. % Tm-doped crystal generated a maximum continuous-wave output power of 1.12 W at ∼ 2.22 and 2.29 µm with a record-high slope efficiency of 69.2% (versus the absorbed pump power), a slightly multimode beam ( M x , y 2 = 2.2 and 2.6), and a linear laser polarization. The ∼ 2.3 µ m laser outperformed the one operating on the conventional 3 F 4 → 3 H 6 transition (at ∼ 1.95 µ m ). The effect of the Tm concentration on the ∼ 2.3 µ m laser performance indicates a gradually increasing pump quantum efficiency for the 3 H 4 upper laser level with the Tm doping. For the 3 at. % Tm-doped crystal, it reached 1.8 ± 0.1 (almost two-for-one pump process), which is attributed to efficient energy-transfer upconversion. We discuss the physical nature of the laser emissions occurring at intermediate wavelengths between the electronic 3 H 4 → 3 H 5 and 3 F 4 → 3 H 6 transitions and highlight the role of electron-phonon coupling (vibronic processes) in the appearance of such laser lines. This allowed us to better understand the near- and mid-infrared emission from thulium ions, which can be used in broadly tunable and fs mode-locked 2–2.3 µm lasers.

Published
2021

28. Highly-Doped Er:LiYF4 Waveguiding Epitaxial Films for ~2.7 µm Laser Sources

Author

Gurvan Brasse, Jean-Louis Doualan, Liza Basyrova, Pavel Loiko, Abdelmjid Benayad, Patrice Camy, Alain Braud, Optique, Matériaux et Laser (OML), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Waveguide lasers, [PHYS]Physics [physics], Materials science, business.industry, Doping, Liquid phase, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Laser, Epitaxy, 01 natural sciences, law.invention, 010309 optics, Erbium laser, law, 0103 physical sciences, Optoelectronics, Thin film, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS
Abstract

Single-crystalline oriented highly-doped 9.6 at.% Er3+:LiYF4 waveguiding thin films (30-50 µm) are grown by Liquid Phase Epitaxy. Their polarized spectroscopic properties are studied. The maximum stimulated-emission cross-section is 1.61×10-20 cm2 at 2720 nm for π-polarization.

Published
2021

29. Er:KY 3 F 10 laser at 280 µm

Author

Christophe Labbé, Liza Basyrova, Jean-Louis Doualan, Pavel Loiko, Alain Braud, Patrice Camy, Abdelmjid Benayad, Universitat Rovira i Virgili, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Nanomatériaux, Ions et Métamatériaux pour la Photonique (NIMPH), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Optique, Matériaux et Laser (OML), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and ANR-19-CE08-0028,SPLENDID2,Lasers solides et amplificateurs à impulsions courtes au-delà de 2 µm(2019)

Subjects
Materials science, Analytical chemistry, 02 engineering and technology, 7. Clean energy, 01 natural sciences, law.invention, Ion, [SPI.MAT]Engineering Sciences [physics]/Materials, 010309 optics, Crystal, [PHYS.PHYS.PHYS-COMP-PH]Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph], Optics, law, Fiber laser, 0103 physical sciences, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Laser threshold, ComputingMilieux_MISCELLANEOUS, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Slope efficiency, [CHIM.MATE]Chemical Sciences/Material chemistry, Gain bandwidth, 021001 nanoscience & nanotechnology, Laser, Atomic and Molecular Physics, and Optics, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, business
Abstract

We report on the mid-infrared laser operation of a cubic 15 at.% E r 3 + : K Y 3 F 10 crystal. In the quasi-continuous-wave regime, the peak power reaches 255 mW at 2.80 µm (the 4 I 11 / 2 → 4 I 13 / 2 transition) with a slope efficiency of 10.9% and a laser threshold of 58 mW. Two pumping schemes (to the 4 I 11 / 2 and 4 I 9 / 2 states) are compared. The emission properties of the E r 3 + ions in K Y 3 F 10 are studied, indicating high stimulated-emission cross-section of 0.57 × 10 − 20 c m 2 at 2.80 µm, a large gain bandwidth of 40 nm, and a long 4 I 11 / 2 state lifetime of 4.64 ms.

Published
2021

31. Watt-Level Thulium Laser Operating on the 3H4 → 3 H5 Transition with ~70% Slope Efficiency

Author

Valentin Petrov, Pavel Loiko, Magdalena Aguiló, Francesc Díaz, Jean-Louis Doualan, Lauren Guillemot, Esrom Kifle, Florent Starecki, Alain Braud, Xavier Mateos, Patrice Camy, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Optique, Matériaux et Laser (OML), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Física i Cristallografia de Materials i Nanomaterials (FiCMA-FiCNA), UniversitatRovira i Virgili (URV), Max-Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN)

Subjects
Watt, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, Slope efficiency, 02 engineering and technology, 7. Clean energy, 01 natural sciences, Thulium laser, Photon upconversion, 010309 optics, 020210 optoelectronics & photonics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, business, Laser beams
Abstract

A Thulium laser operating on the 3H4→3H5 transition in high-phonon-energy KLu(WO4)2 generates 1.12 W at 2.22&2.29 μm with a record-high slope efficiency of 69.2% representing a two-for-one pump process through efficient energy-transfer upconversion.

Published
2020

32. Emission properties of Tm3+-doped CaF2, KY3F10, LiYF4, LiLuF 4 and BaY2F8 crystals at 1.5 μm and 2.3 μm

Author

Abdelmjid Benayad, Pavel Loiko, Jean-Louis Doualan, Elena Dunina, Alain Braud, Florent Starecki, Alexey Kornienko, Patrice Camy, Richard Moncorgé, Lauren Guillemot, Liudmila Fomicheva, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), ANR-19-CE08-0028,SPLENDID2,Lasers solides et amplificateurs à impulsions courtes au-delà de 2 µm(2019), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)

Subjects
Materials science, Biophysics, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Biochemistry, Ion, law.invention, Tetragonal crystal system, law, Emission spectrum, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], Doping, General Chemistry, Configuration interaction, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Thulium, chemistry, 0210 nano-technology, Monoclinic crystal system
Abstract

Thulium ions (Tm3+) are known for their emissions in the near- and mid-infrared spectral ranges suitable for efficient laser operation. We systematically study the stimulated-emission cross-sections σSE for the 3H4 → 3F4 (at ~1.5 μm) and 3H4 → 3H5 (at ~2.3 μm) Tm3+ transitions in five low-phonon energy fluoride single-crystals, namely, cubic Tm:CaF2 and Tm:KY3F10, tetragonal Tm:LiYF4 and Tm:LiLuF4 and monoclinic Tm:BaY2F8. A promising material is Tm:BaY2F8 which offers broad and intense polarized emission spectra in the mid-infrared (2251–2452 nm); the maximum σSE is 0.39 × 10−20 cm2 at 2289 nm (for E ||Z) and the emission bandwidth is exceeding 100 nm (for E ||X). We also revise the transition probabilities for Tm3+ ions in LiLuF4 and BaY2F8 crystals using the Judd-Ofelt formalism and accounting for an intermediate configuration interaction (ICI).

Published
2020

33. Widely tunable in-band-pumped Tm:CaF

Author

Romain, Thouroude, Aleksey, Tyazhev, Ammar, Hideur, Pavel, Loiko, Patrice, Camy, Jean-Louis, Doualan, Hervé, Gilles, and Mathieu, Laroche

Abstract

This Letter presents the efficient laser operation of a

Published
2020

34. Co-sputtered Pr

Author

Geoffrey, Louvet, Simone, Normani, Loïc, Bodiou, Jan, Gutwirth, Jonathan, Lemaitre, Parastesh, Pirasteh, Jean-Louis, Doualan, Albane, Benardais, Yannick, Ledemi, Younes, Messaddeq, Petr, Němec, Joël, Charrier, and Virginie, Nazabal

Abstract

This work reports on the properties of luminescent waveguides based on quaternary Ga-Ge-Sb-Se amorphous thin films doped with praseodymium. The waveguides were fabricated via magnetron co-sputtering, followed by inductively coupled plasma reactive ion etching. The initial thin film thickness and optical properties were assessed and the spectroscopic properties of the waveguides were measured. The measurements show promising results-it is possible to obtain mid-infrared fluorescence at 2.5 and 4.5 µm by injecting near-infrared light at 1.5 µm as the pump beam. By comparing waveguides with various praseodymium concentrations, the optimal doping content for maximum fluorescence intensity was identified to be close to 4100 ppmw. Finally, correlation between the intensity of mid-infrared emission and the width/length of the waveguide is shown.

Published
2020

35. Widely tunable in-band-pumped Tm:CaF 2 laser

Author

Pavel Loiko, Hervé Gilles, Mathieu Laroche, Jean-Louis Doualan, Ammar Hideur, Patrice Camy, Aleksey Tyazhev, Romain Thouroude, Complexe de recherche interprofessionnel en aérothermochimie (CORIA), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN)

Subjects
[PHYS]Physics [physics], Range (particle radiation), Materials science, business.industry, Slope efficiency, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, Crystal, Wavelength, Optics, law, Fiber laser, 0103 physical sciences, 0210 nano-technology, business, Laser beams, Beam (structure), ComputingMilieux_MISCELLANEOUS
Abstract

This Letter presents the efficient laser operation of a T m : C a F 2 crystal in-band pumped at 1610 nm by an Er-Yb-codoped fiber laser system. A laser slope efficiency of 55% (versus incident pump power) was achieved in a continuous-wave regime, with a maximum output power of 1.25 W at ∼ 1.88 µ m in a nearly diffraction-limited beam ( M 2 = 1.14 ). We also demonstrated a continuous tuning range of 180 nm, which extends to short wavelengths down to 1773 nm.

Published
2020

36. Comparative study of Er3+-doped Ga-Ge-Sb-S thin films fabricated by sputtering and pulsed laser deposition

Author

Virginie Nazabal, Florent Starecki, Simone Normani, Marek Bouška, Jean-Luc Adam, Petr Němec, Younes Messaddeq, Jean-Louis Doualan, Yannick Ledemi, Geoffrey Louvet, Jan Gutwirth, Emeline Baudet, Department of Graphic Arts and Photophysics [University of Pardubice], Faculty of Chemical Technology [University of Pardubice], University of Pardubice-University of Pardubice, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes-Centre National de la Recherche Scientifique (CNRS), University of Pardubice, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Université Laval [Québec] (ULaval), Centre d'Optique, Photonique et Laser (COPL), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Photoluminescence, Materials science, Chalcogenide, lcsh:Medicine, 02 engineering and technology, 01 natural sciences, Pulsed laser deposition, 010309 optics, chemistry.chemical_compound, Sputtering, 0103 physical sciences, [CHIM]Chemical Sciences, Thin film, lcsh:Science, ComputingMilieux_MISCELLANEOUS, Multidisciplinary, business.industry, lcsh:R, Doping, Sputter deposition, 021001 nanoscience & nanotechnology, Amorphous solid, chemistry, Optoelectronics, lcsh:Q, 0210 nano-technology, business
Abstract

Despite the renewed interest in rare earth-doped chalcogenide glasses lying mainly in mid-infrared applications, a few comprehensive studies so far have presented the photoluminescence of amorphous chalcogenide films from visible to mid-infrared. This work reports the fabrication of luminescent quaternary sulfide thin films using radio-frequency sputtering and pulsed laser deposition, and the characterization of their chemical composition, morphology, structure, refractive index and Er3+ photoluminescence. The study of Er3+ 4I13/2 level lifetimes enables developing suitable deposition parameters; the dependency of composition, structural and spectroscopic properties on deposition parameters provides a way to tailor the RE-doped thin film properties. The surface roughness is very low for both deposition methods, ensuring reasonable propagation optical losses. The effects of annealing on the sulfide films spectroscopy and lifetimes were assessed. PLD appears consistent composition-wise, and largely independent of the deposition conditions, but radiofrequency magnetron sputtering seems to be more versatile, as one may tailor the film properties through deposition parameters manipulation. The luminescence via rare earth-doped chalcogenide waveguiding micro-structures might find easy-to-use applications concerning telecommunications or on-chip optical sensors for which luminescent sources or amplifiers operating at different wavelengths are required.

Published
2020

37. Cross-relaxation and ion clustering in Tm3+:CaF2 crystals

Author

Jean-Louis Doualan, Pavel Loiko, Abdelmjid Benayad, Alain Braud, Lauren Guillemot, Patrice Camy, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Optique, Matériaux et Laser (OML), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN)

Subjects
Range (particle radiation), [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Doping, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Photon upconversion, law.invention, Ion, 010309 optics, chemistry, law, 0103 physical sciences, Fluorine, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Cluster analysis, Luminescence
Abstract

International audience; We systematically study cross-relaxation (CR) and ion clustering in Tm3+:CaF2 crystals using a spectroscopic approach. For this, the luminescence from the 3H4 and 3F4 states was monitored for a broad range of Tm3+ doping concentrations, from 0.01 at.% to 7 at.%. The decay curves were fitted using a model of two ions classes, namely isolated ions showing no energy-transfer processes and ions with neighbors exhibiting both CR and energy-transfer upconversion (ETU), and accounting for energy-migration. The fraction of ions with neighbors and the microscopic concentration-independent CR and ETU parameters are deduced. The critical Tm3+ doping level for which at least half of the active ions are clustered is only 0.7 at.%. The obtained results are relevant for achieving efficient laser operation of Tm3+:CaF2 crystals at the 3F4 → 3H6 (at ~1.9 μm) and the 3H4 → 3H5 (at ~2.3 μm) transitions.

Published
2020

38. Polarized spectroscopy and laser operation of Tm3+:YAlO3 crystal on the 3H4 → 3H5 transition

Author

Lauren Guillemot, Pavel Loiko, Ammar Hideur, Michal Koselja, Richard Moncorgé, Esrom Kifle, Jean-Louis Doualan, Patrice Camy, Alain Braud, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Complexe de recherche interprofessionnel en aérothermochimie (CORIA), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Institute of Physics of the Czech Academy of Sciences (FZU / CAS), Czech Academy of Sciences [Prague] (CAS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université de Rouen Normandie (UNIROUEN), and Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie)

Subjects
Materials science, Slope efficiency, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Yttrium, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, 010309 optics, Thulium, chemistry, law, 0103 physical sciences, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Orthorhombic crystal system, Stimulated emission, 0210 nano-technology, Spectroscopy, Luminescence
Abstract

International audience; Yttrium orthoaluminate (YAlO3) is an attractive laser host crystal for doping with thulium (Tm3+) ions. We report on the absorption and stimulated-emission (SE) cross-sections of this orthorhombic (sp. gr. Pnma) Tm:YAlO3 crystal for the principal light polarizations, E || a, b and c. Polarized absorption data lead to the Judd-Ofelt parameters Ω2 = 1.46, Ω4 = 2.82 and Ω6 = 1.09 [10-20 cm2]. In particular, for the 3H4 → 3H5 transition, it is found a stimulated emission cross section of 0.86×10-20 cm2 at 2278 nm corresponding to an emission bandwidth of ~12 nm (for E || b). Continuous-wave laser operation on this 3H4 → 3H5 transition is achieved with an 1.8 at.% Tm:YAlO3 crystal under laser-pumping at 776 nm. The mid-infrared Tm:YAlO3 laser generated 0.96 W at ~2274 nm with a slope efficiency of 61.8% and a linear laser polarization (E || b). Tm:YAlO3 is promising for mode-locked lasers at ~2.3 μm.

Published
2020

39. Close look on cubic Tm:KY

Author

Lauren, Guillemot, Pavel, Loiko, Rémi, Soulard, Alain, Braud, Jean-Louis, Doualan, Ammar, Hideur, and Patrice, Camy

Abstract

We report on Czochralski growth, detailed ground- and excited-state absorption and emission spectroscopy and highly-efficient mid-infrared (∼2.3 µm) laser operation of a cubic potassium yttrium fluoride crystal, Tm:KY

Published
2020

40. Passively mode-locked diode-pumped Tm,Ho:LiYF4 laser

Author

Jean-Louis Doualan, Aleksey Tyazhev, Thomas Godin, Marlène Paris, Pavel Loiko, Patrice Camy, Lauren Guillemot, Alain Braud, Ammar Hideur, Rémi Soulard, Complexe de recherche interprofessionnel en aérothermochimie (CORIA), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Coupling, [PHYS]Physics [physics], [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Physics and Astronomy (miscellaneous), Graphene, business.industry, chemistry.chemical_element, Saturable absorption, Laser, 7. Clean energy, 01 natural sciences, law.invention, Power (physics), 010309 optics, chemistry, law, 0103 physical sciences, Optoelectronics, 010306 general physics, Holmium, business, Instrumentation, Diode
Abstract

International audience; We report on the first demonstration of a diode-pumped passively mode-locked Tm,Ho:LiYF4 laser. Stable continuous-wave mode-locking is achieved by employing a single-layer graphene as a saturable absorber (SA). For a reflection-type graphene-SA, the laser delivers 5.2 ps pulses at ~2051 nm with an average output power of 40 mW at a repetition rate of 89.86 MHz. With a transmission-type graphene-SA and smaller output coupling, the output power is scaled up to 80 mW while the laser operated in a double-pulse regime.

Published
2020

41. Comparative study of Er

Author

Simone, Normani, Geoffrey, Louvet, Emeline, Baudet, Marek, Bouška, Jan, Gutwirth, Florent, Starecki, Jean-Louis, Doualan, Yannick, Ledemi, Younes, Messaddeq, Jean-Luc, Adam, Petr, Němec, and Virginie, Nazabal

Subjects
Glasses, Optical materials, Lasers, LEDs and light sources, Article, Materials science, Materials for optics
Abstract

Despite the renewed interest in rare earth-doped chalcogenide glasses lying mainly in mid-infrared applications, a few comprehensive studies so far have presented the photoluminescence of amorphous chalcogenide films from visible to mid-infrared. This work reports the fabrication of luminescent quaternary sulfide thin films using radio-frequency sputtering and pulsed laser deposition, and the characterization of their chemical composition, morphology, structure, refractive index and Er3+ photoluminescence. The study of Er3+ 4I13/2 level lifetimes enables developing suitable deposition parameters; the dependency of composition, structural and spectroscopic properties on deposition parameters provides a way to tailor the RE-doped thin film properties. The surface roughness is very low for both deposition methods, ensuring reasonable propagation optical losses. The effects of annealing on the sulfide films spectroscopy and lifetimes were assessed. PLD appears consistent composition-wise, and largely independent of the deposition conditions, but radiofrequency magnetron sputtering seems to be more versatile, as one may tailor the film properties through deposition parameters manipulation. The luminescence via rare earth-doped chalcogenide waveguiding micro-structures might find easy-to-use applications concerning telecommunications or on-chip optical sensors for which luminescent sources or amplifiers operating at different wavelengths are required.

Published
2020

42. Co-sputtered Pr 3+ -doped Ga-Ge-Sb-Se active waveguides for mid-infrared operation

Author

Yannick Ledemi, Younes Messaddeq, Simone Normani, Jean-Louis Doualan, Geoffrey Louvet, Joël Charrier, Albane Benardais, Parastesh Pirasteh, Virginie Nazabal, Jan Gutwirth, Loïc Bodiou, Petr Němec, Jonathan Lemaitre, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université Laval [Québec] (ULaval), University of Pardubice, Laboratoire d'Optronique, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Centre National de la Recherche Scientifique, Région Bretagne, Photonics Innovations for PhD funds, Canada Excellence Research Chairs, Government of Canada, COST MP1401-STSM, Grantová Agentura České Republiky, OP RDE project CZ.02.2.69/0.0/0.0/16_027/0008008, International Mobility of Researchers at the University of Pardubice, Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Praseodymium, Physics::Optics, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, 010309 optics, Condensed Matter::Materials Science, Optics, 0103 physical sciences, [CHIM]Chemical Sciences, Thin film, Reactive-ion etching, Astrophysics::Galaxy Astrophysics, business.industry, Doping, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, Amorphous solid, chemistry, Cavity magnetron, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, Inductively coupled plasma, 0210 nano-technology, Luminescence, business
Abstract

This work reports on the properties of luminescent waveguides based on quaternary Ga-Ge-Sb-Se amorphous thin films doped with praseodymium. The waveguides were fabricated via magnetron co-sputtering, followed by inductively coupled plasma reactive ion etching. The initial thin film thickness and optical properties were assessed and the spectroscopic properties of the waveguides were measured. The measurements show promising results—it is possible to obtain mid-infrared fluorescence at 2.5 and 4.5 µm by injecting near-infrared light at 1.5 µm as the pump beam. By comparing waveguides with various praseodymium concentrations, the optimal doping content for maximum fluorescence intensity was identified to be close to 4100 ppmw. Finally, correlation between the intensity of mid-infrared emission and the width/length of the waveguide is shown.

Published
2020

43. Excited-State Absorption Spectroscopy of Thulium-Doped Fluoride Crystals for Upconversion Pumping

Author

Jean-Louis Doualan, Florent Starecki, Patrice Camy, Alain Braud, Pavel Loiko, and Lauren Guillemot

Subjects
Materials science, Thulium, chemistry, Fluoride crystals, Doping, chemistry.chemical_element, Excited state absorption, Photochemistry, Spectroscopy, Photon upconversion
Abstract

We report on polarized excited-state absorption (ESA) spectroscopy of thulium-doped fluoride crystals (KY3F10, LiYF4, LiLuF4 and BaY2Y8). The 3F4 → 3F2,3 and 3F4→3H4 ESA channels suitable for upconversion pumping of ~2.3 μm thulium lasers were studied.

Published
2020

44. Liquid Phase Epitaxy Growth and Spectroscopy of Waveguiding Tm3+:CaF2 Thin Films

Author

Alain Braud, Abdelmjid Benayad, Pavel Loiko, Jean-Louis Doualan, Patrice Camy, Liza Basyrova, Gozhalskii Daniil, and Gurvan Brasse

Subjects
symbols.namesake, Materials science, Absorption spectroscopy, X-ray crystallography, symbols, Analytical chemistry, Liquid phase, Thin film, Absorption (chemistry), Epitaxy, Spectroscopy, Raman spectroscopy
Abstract

Single-crystalline 1.5-5 at.% Tm3+:CaF2 layers (thickness: 20-120 µm) are grown by Liquid Phase Epitaxy. Their structure, absorption, emission and waveguiding properties (propagation losses: 3+ clusters is evidenced.

Published
2020

45. Close look on cubic Tm:KY 3 F 10 crystal for highly efficient lasing on the 3 H 4 → 3 H 5 transition

Author

Jean-Louis Doualan, Rémi Soulard, Lauren Guillemot, Alain Braud, Ammar Hideur, Patrice Camy, Pavel Loiko, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux (ARTEMIS), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Complexe de recherche interprofessionnel en aérothermochimie (CORIA), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), ANR-19-CE08-0028,SPLENDID2,Lasers solides et amplificateurs à impulsions courtes au-delà de 2 µm(2019), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Université Nice Sophia Antipolis (... - 2019) (UNS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN)

Subjects
Materials science, Absorption spectroscopy, business.industry, Slope efficiency, Analytical chemistry, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, 7. Clean energy, Atomic and Molecular Physics, and Optics, Photon upconversion, law.invention, 010309 optics, Optics, law, 0103 physical sciences, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Quantum efficiency, Emission spectrum, 0210 nano-technology, business, Lasing threshold, Ultrashort pulse
Abstract

We report on Czochralski growth, detailed ground- and excited-state absorption and emission spectroscopy and highly-efficient mid-infrared (∼2.3 µm) laser operation of a cubic potassium yttrium fluoride crystal, Tm:KY3F10. The peak stimulated-emission cross-section for the 3H4 → 3H5 transition is 0.34×10−20 cm2 at 2345 nm with an emission bandwidth exceeding 50 nm. The excited-state absorption spectra for the 3F4 → 3F2,3 and 3F4 → 3H4 transitions are measured and the cross-relaxation is quantified. A continuous-wave 5 at.% Tm:KY3F10 laser generated 0.84 W at 2331-2346 nm by pumping at 773 nm, with a record-high slope efficiency of 47.7% (versus the incident pump power) owing to the efficient action of energy-transfer upconversion leading to a pump quantum efficiency approaching 2. The first Tm:KY3F10 laser with ESA-assisted upconversion pumping (at 1048 nm) is also demonstrated. Due to its broadband emission properties, Tm:KY3F10 is promising for ultrashort pulse generation at ∼2.3-2.4 µm.

Published
2020

46. SESAM-mode-locked Tm:KY3F10 laser at 2340 nm

Author

Abdelmjid Benayad, Maciej Kowalczyk, Jean-Louis Doualan, Ammar Hideur, Patrice Camy, Pavel Loiko, Alain Braud, Lauren Guillemot, and Jaroslaw Sotor

Subjects
Materials science, Mode-locking, business.industry, law, Mode (statistics), Optoelectronics, Pulse duration, Limiting, Semiconductor saturable absorber, business, Laser, Fabry–Pérot interferometer, law.invention
Abstract

A Tm: KY3F10 laser operating on the 3H4 →3H5 transition (2340 nm) is mode-locked by a semiconductor saturable absorber mirror. A strong etalon effect originating from the SESAM is observed limiting the pulse duration to ~100 ps.

Published
2020

47. Growth and mid-infrared emission properties of 'mixed' fluorite-type Er:(Ca,Sr)F2 and Er:(Ba,Sr)F2 crystals

Author

Liza Basyrova, Pavel Loiko, Abdelmjid Benayad, Gurvan Brasse, Jean-Louis Doualan, Alain Braud, Ammar Hideur, and Patrice Camy

Abstract

Fluorite-type 5 at.% Er3+:(M1,M2)F2 (M1 = Ca, Ba; M2 = Sr) crystals were grown by the conventional Bridgman technique and a comparative study of their spectroscopic properties was performed. The vibronic properties of the fluorite-type crystals were studied by Raman spectroscopy. The Er:(M1,M2)F2 crystals exhibited a slightly inhomogeneous broadening of mid-infrared luminescence spectra as compared to the ‘parent’ compound, Er:SrF2. The luminescence lifetimes of the 4I11/2 and 4I13/2 manifolds were measured, e.g., for the Er:(Ca,Sr)F2 crystal, the luminescence lifetimes were estimated to be 8.64 ms and 5.64 ms, respectively, representing a favorable ratio for mid-IR laser operation.

Published
2022

48. Excited-state absorption and fluorescence dynamics in Er:CaF2

Author

Patrice Camy, Jean-Louis Doualan, Richard Moncorgé, Christophe Labbé, Alain Braud, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Absorption spectroscopy, Population, Biophysics, 02 engineering and technology, 01 natural sciences, Biochemistry, Spectral line, [SPI.MAT]Engineering Sciences [physics]/Materials, [PHYS.PHYS.PHYS-COMP-PH]Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph], 010309 optics, 0103 physical sciences, Radiative transfer, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Excited state absorption, education, ComputingMilieux_MISCELLANEOUS, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], education.field_of_study, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, Rate equation, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Emission intensity, Fluorescence, Atomic and Molecular Physics, and Optics, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Atomic physics, 0210 nano-technology
Abstract

Emission, ground- and excited-state absorption spectra of Er:CaF2 single crystals were registered from the visible to the mid-infrared. These spectra were calibrated in unit of cross section and analyzed to derive purely radiative lifetimes and branching ratios. Fluorescence decays were then recorded to determine effective emission lifetimes and branching ratios including non-radiative multiphonon relaxations. These fluorescence data along with population ratios and emission intensity measurements performed versus pumping rates were finally confronted with a rate equation model to derive energy transfer rates.

Published
2018

49. Design and modeling of a passively Q-switched diode-pumped Thulium laser at 2.3 μm

Author

Ammar Hideur, Jean-Louis Doualan, Pavel Loiko, Patrice Camy, Lauren Guillemot, Alain Braud, Florent Starecki, Esrom Kifle, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Optique, Matériaux et Laser (OML), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Complexe de recherche interprofessionnel en aérothermochimie (CORIA), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and ANR-19-CE08-0028,SPLENDID2,Lasers solides et amplificateurs à impulsions courtes au-delà de 2 µm(2019)

Subjects
Diffraction, Active laser medium, Materials science, 02 engineering and technology, 01 natural sciences, law.invention, 010309 optics, Optics, law, 0103 physical sciences, Laser power scaling, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, ComputingMilieux_MISCELLANEOUS, Diode, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Linear polarization, Saturable absorption, 021001 nanoscience & nanotechnology, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Pulse (physics), [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, 0210 nano-technology, business
Abstract

We report on a diode-pumped Tm:LiYF4 laser operating on the 3H4 → 3H5 transition (at ∼ 2 . 3 μ m) passively Q-switched by a Cr2＋:ZnSe saturable absorber. This laser delivers a maximum average output power of 130 mW at 2304.6 nm with a nearly diffraction limited beam, a linear polarization ( π ) and no colasing at ∼ 1 . 9 μ m. The corresponding pulse characteristics (duration/energy) are 1.24 μ s/3.6 μ J at a repetition rate of 36 kHz. By power scaling under quasi-CW pumping, even shorter pulse durations of 870 ns and higher pulse energies of 6.1 μ J are achieved. The performance of the laser is simulated using a model of a quasi-four-level gain medium and a “slow” saturable absorber showing a good agreement with the experiment. The effect of the thermal lens of the saturable absorber on the pulse characteristics is discussed.

Published
2021

50. Optical and Structural Properties of Mn 4+ ‐Activated (Zn x Mg 1– x ) 2 TiO 4 Red Phosphors

Author

Tetyana Kryshtab, Oleksandr Gudymenko, Christophe Labbé, Igor Vorona, T. Stara, Jean-Louis Doualan, V. P. Kladko, Valentyna Nosenko, Julien Cardin, Kostiantyn Kozoriz, and L. V. Borkovska

Subjects
Photoluminescence, Materials science, Analytical chemistry, Phosphor, 02 engineering and technology, Surfaces and Interfaces, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, law, X-ray crystallography, Materials Chemistry, Electrical and Electronic Engineering, 0210 nano-technology, Electron paramagnetic resonance, Solid solution
Published
2021

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