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3. Thulium Lasers at ~2.3 µm Based on Upconversion-Pumping Scheme

Author

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

Subjects
Photon, Thulium, Materials science, chemistry, business.industry, law, Optoelectronics, chemistry.chemical_element, business, Absorption (electromagnetic radiation), Laser, Photon upconversion, law.invention
Abstract

Novel upconversion pumping schemes based on excited-state absorption (ESA) and photon avalanche are proposed for 2.3 μm (3H4→3H5) Thulium lasers. Low-threshold Tm3+:LiYF4 laser pumped at 1040 nm generates 102 mW at 2302 nm.

Published
2019
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4. 52-fs SESAM Mode-Locked Tm,Ho:CALGO Laser

Author

Jun Xu, Zhongben Pan, Mark Mero, Xavier Mateos, Yongguang Zhao, Pavel Loiko, Soile Suomalainen, Antti Härkönen, Weidong Chen, Yicheng Wang, Valentin Petrov, Xiaodong Xu, Mircea Guina, Uwe Griebner, and Arkady Major

Subjects
Materials science, Mode-locking, Dopant, business.industry, law, Energy transfer, Mode (statistics), Optoelectronics, Second-harmonic generation, business, Laser, Power (physics), law.invention
Abstract

A SESAM mode-locked Tm,Ho:CALGO laser emitting at 2.015 µm due to the combined gain of both dopants generates pulses as short as 52 fs with a maximum output power of 376 mW at 86 MHz.

Published
2019
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5. Spectroscopy and High-Power Laser Operation of Monoclinic Yb3+:MgWO4 crystal

Author

Lizhen Zhang, Josep Maria Serres, Haifeng Lin, Uwe Griebner, Pavel Loiko, Zhenqiang Chen, Yicheng Wang, Francesc Díaz, Valentin Petrov, Ge Zhang, Zhoubin Lin, Shibo Dai, Weidong Chen, Xavier Mateos, Patrice Camy, Magdalena Aguiló, and Mengting Chen

Subjects
Materials science, High power lasers, business.industry, Slope efficiency, Laser, Power (physics), law.invention, Crystal, law, Fiber laser, Optoelectronics, business, Spectroscopy, Monoclinic crystal system
Abstract

Monoclinic 1.25 at.% Yb3+:MgWO4 crystals are grown by the Top-Seeded-Solution-Growth method and their room- and low-temperature spectroscopy is studied. A diode-pumped Yb3+:MgWO4 laser generates 18.2 W at ~1056 nm with a slope efficiency of ~89%.

Published
2019
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7. Highly-Efficient Femtosecond-Laser-Written Waveguide Lasers at ~2 µm in Monoclinic Tm:MgWO4

Author

Xavier Mateos, Javier R. Vázquez de Aldana, Esrom Kifle, Uwe Griebner, Magdalena Aguiló, Pavel Loiko, Airan Rodenas, Valentin Petrov, Francesc Díaz, Ge Zhang, Haifeng Lin, Zhoubin Lin, Lizhen Zhang, and Weidong Chen

Subjects
Waveguide lasers, Materials science, business.industry, Slope efficiency, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Waveguide (optics), law.invention, 010309 optics, Regenerative amplification, law, 0103 physical sciences, Femtosecond, Optoelectronics, 0210 nano-technology, business, Laser beams, Monoclinic crystal system
Abstract

A channel waveguide (propagation loss: ∼0.1 dB/cm) laser femtosecond-laser-written in monoclinic Tm:MgWO 4 generated up to 320 mW slightly above 2 μm (slope efficiency up to 71%) and vibronic laser emission extending up to ∼2.08 μm.

Published
2018
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8. Growth, spectroscopy and laser operation of 'mixed' Tm:Ca(Gd,Lu)AlO4 – A novel crystal for mode-locked lasers

Author

Yongguang Zhao, Uwe Griebner, Pavel Loiko, Esrom Kifle, Huaqiang Cai, Magdalena Aguiló, Zhongben Pan, F. Díaz, Hualei Yuan, Yicheng Wang, Valentin Petrov, Xiaojun Dai, Josep Maria Serres, and Xavier Mateos

Subjects
Materials science, Slope efficiency, Analytical chemistry, chemistry.chemical_element, Laser, law.invention, Crystal, symbols.namesake, Tetragonal crystal system, Thulium, chemistry, law, X-ray crystallography, symbols, Spectroscopy, Raman spectroscopy
Abstract

A tetragonal “mixed” Tm:Ca(Gd,Lu)AlO4 crystal is grown by the Czochralski method. The Lu3+-doping broadens the Tm3+ gain spectra. A diode-pumped Tm:Ca(Gd,Lu)AlO4 laser generated 1.82 W at 1945 nm with a slope efficiency of 29%.

Published
2018
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9. Efficient bulk and waveguide Tm:LiYF4 lasers at 2306 nm

Author

Jean-Louis Doualan, Gurvan Brasse, Ammar Hideur, Rémi Soulard, Lauren Guillemot, Blandine Guichardaz, Alain Braud, Aleksey Tyazhev, Patrice Camy, Frédéric Druon, 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), 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), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Espaces et Sociétés (ESO), Normandie Université (NU)-Normandie Université (NU)-Le Mans Université (UM)-Université d'Angers (UA)-AGROCAMPUS OUEST-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN), Université de Nantes (UN)-Université de Nantes (UN), Laboratoire Charles Fabry / Lasers, Laboratoire Charles Fabry (LCF), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), 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)-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), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 2 (UR2), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université d'Angers (UA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Le Mans Université (UM), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)

Subjects
[PHYS]Physics [physics], Waveguide lasers, Waveguide (electromagnetism), Materials science, business.industry, Slope efficiency, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 7. Clean energy, 01 natural sciences, law.invention, 010309 optics, Light propagation, law, 0103 physical sciences, Optoelectronics, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS
Abstract

The 3H4→3H5 transition of Tm3+ in LiYF4 is characterized. Efficient 2.3-μm bulk and waveguide lasers are demonstrated. A CW diamond-saw-diced channel waveguide laser generated 147 mW at 2306 nm with a slope efficiency of 33.5%.

Published
2018
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10. Sub-100 fs pulse generation from a Tm,Ho:CALYO laser mode-locked by a GaSb-based SESAM at ~2043 nm

Author

Deyuan Shen, Mircea Guina, Yongguang Zhao, Xavier Mateos, Wei Zhou, Pavel Loiko, Antti Harkonen, Yicheng Wang, Xuzhao Zhang, Jun Xu, Zhongben Pan, Valentin Petrov, Solie Suomalainen, Uwe Griebner, and Xiaodong Xu

Subjects
Crystal, Materials science, Pulse (signal processing), business.industry, law, Fiber laser, Laser mode locking, Optoelectronics, business, Laser, law.invention
Abstract

We report on the first sub-100-fs mode-locked Ho3+-laser in the 2-μιη spectral range. The disordered co-doped Tm, Ho:CaYAlO 4 (Tm, Ho:CALYO) crystal produced pulses as short as 87 fs with 27-mW average output power at 80.45-MHz repetition rate.

Published
2018
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11. Tm,Ho:LiYF4 planar waveguide laser at 2.05 μm

Author

Gurvan Brasse, Ammar Hideur, Aleksey Tyazhev, Jean-Louis Doulan, Pavel Loiko, Patrice Camy, Alain Braud, and Rémi Soulard

Subjects
Materials science, business.industry, Slope efficiency, chemistry.chemical_element, Laser, Epitaxy, Waveguide (optics), law.invention, chemistry.chemical_compound, Planar, chemistry, law, Optoelectronics, business, Holmium, Fluoride, Refractive index
Abstract

The first Holmium fluoride waveguide laser is reported using a 25-^m-thick Tm,Ho:LiYF4 layer grown by liquid phase epitaxy. Pumped at 797.2 nm, it generates 81 mW at 2051 nm with a slope efficiency of 24%.

Published
2018
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12. 84-fs Pulse Generation from a Mode-Locked Tm,Ho:CLNGG Laser at 2080 nm

Author

Deyuan Shen, Xiaojun Dai, Pavel Loiko, Valentin Petrov, Hualei Yuan, Ji Eun Bae, Zhongben Pan, Fabian Rotermund, Huaqiang Cai, Uwe Griebner, Yongguang Zhao, Yicheng Wang, Sun Young Choi, Josep Maria Serres, Wei Zhou, Xavier Mateos, and Zhang Yan

Subjects
Materials science, Mode-locking, business.industry, law, Optoelectronics, Saturable absorption, business, Laser, Power (physics), Pulse (physics), law.invention
Abstract

We report on a mode-locked Tm,Ho:CLNGG laser employing SWCNTs as saturable absorber. Transform-limited 84-fs pulses are generated at ~2080 nm for a repetition rate of ~102 MHz with an average output power of 69 mW.

Published
2018
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13. Crystal growth, spectroscopy and femtosecond laser performance of Tm,Na:CNGG disordered garnet crystal

Author

Hualei Yuan, Zhongben Pan, Fabian Rotermund, Xavier Mateos, Ji Eun Bae, Uwe Griebner, Pavel Loiko, Yongguang Zhao, Sun Young Choi, Huaqiang Cai, Valentin Petrov, Yicheng Wang, Josep Maria Serres, and Xiaojun Dai

Subjects
Materials science, business.industry, Saturable absorption, Crystal growth, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, 010309 optics, Crystal, symbols.namesake, Mode-locking, law, 0103 physical sciences, Femtosecond, symbols, Optoelectronics, 0210 nano-technology, business, Spectroscopy, Raman scattering
Abstract

We report on the crystal growth, spectral properties, and mode-locked laser operation of Tm, Na:CNGG, generating pulses as short as 84 fs at ∼2018 nm using single-walled carbon nanotubes as a saturable absorber.

Published
2018
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14. Growth, Characterization and Laser Operation of Tm3+, Na+ codoped CNGG (Tm:CNNGG) Disordered Garnet

Author

Pavel Loiko, Yongguang Zhao, Xavier Mateos, Josep Maria Serres, Francesc Díaz, Magdalena Aguiló, Xiaojun Dai, Uwe Griebner, Huaqiang Cai, Hualei Yuan, Zhongben Pan, Valentin Petrov, and Yicheng Wang

Subjects
010302 applied physics, Materials science, business.industry, Spectral properties, Slope efficiency, Niobium, chemistry.chemical_element, Laser, 01 natural sciences, Characterization (materials science), law.invention, 010309 optics, Crystal, chemistry, law, 0103 physical sciences, Laser mode locking, Optoelectronics, business
Abstract

A Tm, Na-codoped calcium niobium garnet (Tm:CNNGG) crystal was grown and its structure and spectroscopic properties characterized. A diode-pumped Tm:CNNGG laser generated 0.63 W with 24.2% slope efficiency. Tunability from 1885 to 2053 nm was acheived.

Published
2018
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15. Sub-10 optical-cycle mode-locked Tm:(Lu2/3Sc1/3)2O3 mixed ceramic laser at 2057 nm

Author

Pavel Loiko, Yongguang Zhao, Valentin Petrov, Yicheng Wang, Mircea Guina, Soile Suomalainen, Wei Jing, Uwe Griebner, Hui Huang, Antti Härkönen, and Xavier Mateos

Subjects
Range (particle radiation), Materials science, business.industry, Mode (statistics), 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, 010309 optics, symbols.namesake, Mode-locking, law, visual_art, 0103 physical sciences, symbols, visual_art.visual_art_medium, Optoelectronics, Ceramic, 0210 nano-technology, business, Raman scattering
Abstract

We present the first sub-10 optical-cycle bulk solid-state laser emitting in the 2-μm spectral range: A Tm3+:(Lu2/3Sc1/3)2O3 mixed ceramic laser mode-locked by a near-surface design GaSb-based SESAM produced nearly Fourier-limited pulses as short as 63 fs.

Published
2017
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16. Inkjet-Printing of Graphene Saturable Absorbers for ~2 µm Bulk and Waveguide Lasers

Author

Sergei Popov, Pavel Loiko, Josep Maria Serres, Magdalena Aguiló, Mikael Östling, Szymon Sollami Delekta, Alexander V. Baranov, Francesc Díaz, Esrom Kifle, Valentin Petrov, Xavier Mateos, Jiantong Li, and Uwe Griebner

Subjects
Waveguide lasers, Materials science, business.industry, Graphene, Scanning electron microscope, Saturable absorption, 02 engineering and technology, Carbon nanotube, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, 010309 optics, Optics, Mode-locking, law, Fiber laser, 0103 physical sciences, Optoelectronics, 0210 nano-technology, business
Abstract

We report on inkjet-printing of graphene saturable absorbers (SAs) suitable for passive Q-switching of ∼2-μm bulk and waveguide lasers. Using graphene-SA in a microchip Tm:KLu(WO 4 ) 2 laser, 1.2 μJ/136 ns pulses are generated at 1917 nm.

Published
2017
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17. Tm:KY(WO4)2 Planar Waveguide Laser Q-switched by Single-Walled Carbon Nanotubes

Author

Magdalena Aguiló, Pavel Loiko, Uwe Griebner, Xavier Mateos, Fabian Rotermund, Sun Young Choi, Francesc Díaz, Esrom Kifle, and Valentin Petrov

Subjects
Waveguide lasers, Materials science, business.industry, Slope efficiency, Carbon nanotube, Laser, Waveguide (optics), law.invention, Planar, Mode-locking, law, Optoelectronics, business, Laser beams
Abstract

A 5 at.% Tm:KYaGdbLuc(WO4)2/KY(WO4)2 planar waveguide laser passively Q-switched by SWCNTs generated 45 mW at 1835.4 nm with a slope efficiency of 22.5%. The 83-ns-long pulses have an energy of 33 nJ at 1.39 MHz.

Published
2017
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18. Power Scaling and Thermo-Optics of Ho:KY(WO4)2 Thin-Disk Lasers: Effect of Ho3+ Concentration

Author

Sergei Vatnik, Francesc Díaz, Xavier Mateos, Valentin Petrov, Magdalena Aguiló, Pavel Loiko, Uwe Griebner, I. A. Vedin, Samir Lamrini, Peter Fuhrberg, and Karsten Scholle

Subjects
Materials science, business.industry, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, 010309 optics, Optics, Thin disk, law, Fiber laser, 0103 physical sciences, Laser power scaling, 0210 nano-technology, business, Laser beams
Abstract

Thin-disk lasers based on Ho:KY(WO4)2/KY(WO4)2 epitaxies deliver output powers exceeding 1 W at 2056 and 2073 nm. The laser performance and thermo-optic aberrations of such lasers are strongly affected by the Ho3+ concentration.

Published
2017
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19. Growth, Spectroscopy and Laser Operation of Tm-doped Monoclinic Magnesium Tungstate (Tm:MgWO4)

Author

Longkun Zhang, Elena Vilejshikova, Francesc Díaz, Magdalena Aguiló, Guangyu Zhang, Valentin Petrov, Pavel Loiko, Xavier Mateos, Zhanglang Lin, Y. C. Wang, Konstantin Yumashev, Haifeng Lin, Uwe Griebner, Josep Maria Serres, and Weidong Chen

Subjects
Materials science, Magnesium, Slope efficiency, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, 010309 optics, Crystal, chemistry.chemical_compound, symbols.namesake, Tungstate, chemistry, law, 0103 physical sciences, symbols, 0210 nano-technology, Spectroscopy, Raman spectroscopy, Monoclinic crystal system
Abstract

A novel monoclinic magnesium tungstate crystal, Tm:MgWO 4 , was grown and characterized in terms of structure, spectroscopy and laser generation. The output power was 772 mW at 2017–2029 nm with a slope efficiency of 39%.

Published
2017
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20. Growth, Spectroscopy and Laser Operation of Novel 'Mixed' Vanadate Crystals Yb:Lu1-x-yYxLayVO4

Author

Josep Maria Serres, Magdalena Aguiló, Chunying Qiu, Francesc Díaz, Ge Zhang, Valentin Petrov, Haifeng Lin, Xavier Mateos, Pavel Loiko, Weidong Chen, Bin Zhao, and Uwe Griebner

Subjects
Tetragonal crystal system, symbols.namesake, Materials science, Mode-locking, law, Slope efficiency, Analytical chemistry, symbols, Vanadate, Laser, Spectroscopy, Raman spectroscopy, law.invention
Abstract

We report on the growth, structure, Raman spectra and optical spectroscopy of novel “mixed” tetragonal vanadates, Yb:Lu1-x-yYxLayVO4. A CW diode-pumped a-cut Yb:Lu0.74Y0.23La0.01VO4 laser generated 5.0 W at 1044 nm with a slope efficiency of 43%.

Published
2017
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21. Sub-100 fs Tm:MgWO4 laser at 2017 nm

Author

Young Jun Cho, Fabian Rotermund, Pavel Loiko, Mark Mero, Weidong Chen, Ge Zhang, Yicheng Wang, Zhoubin Lin, Uwe Griebner, Lizhen Zhang, Xavier Mateos, Haifeng Lin, and Valentin Petrov

Subjects
Range (particle radiation), Materials science, business.industry, law, Graphene, Optoelectronics, dBc, Carbon nanotube, business, Laser, law.invention
Abstract

We present the first sub-100 fs bulk solid-state laser in the 2-μm spectral range: Tm3+:MgWO4 mode-locked by graphene produced nearly Fourier-limited pulses as short as 86 fs with excellent stability (80 dBc) at 76 MHz.

Published
2017
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22. MoS2 Saturable Absorber for Passive Q-Switching of Yb and Tm Microchip Lasers

Author

Pavel Loiko, Josep Maria Serres, Francesc Díaz, Haohai Yu, Uwe Griebner, Yanxue Chen, Konstantin Yumashev, Huaijin Zhang, Valentin Petrov, Magdalena Aguiló, and Xavier Mateos

Subjects
Materials science, 02 engineering and technology, Chemical vapor deposition, 01 natural sciences, 7. Clean energy, law.invention, Pulsed laser deposition, 010309 optics, Pulse characteristics, 020210 optoelectronics & photonics, Optics, law, Fiber laser, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Graphene, business.industry, Energy conversion efficiency, Slope efficiency, Saturable absorption, 021001 nanoscience & nanotechnology, Laser, Q-switching, Electronic, Optical and Magnetic Materials, Optoelectronics, 0210 nano-technology, business
Abstract

A multi-layer MoS2-based saturable absorber (SA) enables Q-switched operation of Yb and Tm microchip lasers. The saturation intensity of MoS2-SA is determined to be about ~0.5 MW/cm2. The Q-switched Tm laser generated 1.27 W at 1929 nm with a slope efficiency of 43% and conversion efficiency with respect to the continuous-wave mode as high as 81%. The pulse characteristics were 175 ns / 7.5 µJ corresponding to a repetition rate of 170 kHz. With the Q-switched Yb laser, 220 ns / 0.5 µJ pulses were achieved at 1030 nm. We show that using MoS2-SA at ~2 μm is advantageous as compared to multi-layer graphene. We also prove that MoS2-SA is more efficient at ~2 μm compared to ~1 μm due to a lower saturation intensity and higher fraction of the saturable loss.

Published
2016
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23. Refined Orientation of the Optical Axes as a Function of Wavelength in Monoclinic Double Tungstates

Author

Magdalena Aguiló, Patricia Segonds, Alexandra Peña, Francesc Díaz, V. V. Filippov, Jérôme Debray, Xavier Mateos, Benoît Boulanger, Patricia Loren Inácio, Maria Cinta Pujol, Pavel Loiko, Konstantin Yumashev, Daniel Rytz, Marc Eichhorn, Center for Optical Technologies and Department of Materials Science and Engineering, Lehigh University, Optique et Matériaux (OPTIMA ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Cristaux Massifs (CrisMass), FEE Gmbh, FEE GmBh, Universitat Rovira i Virgili, Física i Cristal·lografia de Materials i Nanomaterials (FiCMA-FiCNA), and Pena Revellez, Alexandra

Subjects
[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics], [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, 02 engineering and technology, Dielectric, Function (mathematics), 021001 nanoscience & nanotechnology, Rotation, 01 natural sciences, Molecular physics, Refraction, 010309 optics, Wavelength, Optics, Orientation (geometry), 0103 physical sciences, Beam shaping, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS, Monoclinic crystal system
Abstract

We measured the rotation of the dielectric frame and determined the orientation of the optical axes in KRE(WO4)2 (RE = Gd, Y, Lu) crystals, as a function of wavelength in the 0.4-1.6 μm range.

Published
2016
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24. Tm:(LuxGd1–x)3Ga5O12 Disordered Garnet for Continuous-Wave and Passively Q-switched Microchip Lasers

Author

Konstantin Yumashev, Uwe Griebner, Pavel Loiko, Yanru Yin, Zhitai Jia, Valentin Petrov, Mauro Tonelli, Sun Young Choi, Xavier Mateos, Wenxiang Mu, Stefano Veronesi, Fabian Rotermund, and Xutang Tao

Subjects
Materials science, law, business.industry, Slope efficiency, Continuous wave, Optoelectronics, Microchip laser, Laser, business, law.invention
Abstract

A microchip laser based on a disordered Tm:(LuxGd1–x)3Ga5O12 garnet generated 1.71 W at 2015 nm with a slope efficiency of 55%. This laser is passively Q-switched by SWCNTs delivering 15.7-μJ, 190-ns pulses.

Published
2016
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25. Comparative Study of Tm:LiLnF4 (Ln = Y, Gd, and Lu) Crystals for Microchip Lasers at ~2 μm

Author

Alberto Di Lieto, Uwe Griebner, Valentin Petrov, Pavel Loiko, Konstantin Yumashev, Xavier Mateos, Mauro Tonelli, Stefano Veronesi, Josep Maria Serres, and Simone Tacchini

Subjects
Materials science, law, Slope efficiency, Analytical chemistry, Microchip laser, Laser, law.invention
Abstract

Spectroscopic and thermo-optic properties of Tm:LiLnF4 (Ln = Y, Gd, and Lu) crystals are studied. The Tm:LiYF4 microchip laser generated 3.1 W at 1904 nm with a slope efficiency of 72%.

Published
2016
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26. Microchip Laser Operation of Yb-Doped Gallium Garnets

Author

Tomas Mocek, Magdalena Aguiló, Francesc Díaz, Haohai Yu, Pavel Loiko, Junhai Liu, Valentin Petrov, Uwe Griebner, Venkatesan Jambunathan, Josep Maria Serres, Xavier Mateos, Huaijin Zhang, Konstantin Yumashev, Antonio Lucianetti, Física i Cristal·lografia de Nanomaterials, Física i Cristal.lografia de Materials, Química Física i Inorgànica, and Universitat Rovira i Virgili

Subjects
Materials science, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Output coupler, 01 natural sciences, law.invention, 010309 optics, Crystal, Optics, Thermal conductivity, law, Microchip lasers, 0103 physical sciences, Laser power scaling, Gallium, Laser beams, Laser sources, business.industry, Slope efficiency, Doping, Química, Microchip laser, 021001 nanoscience & nanotechnology, Laser, 2159-3930, Electronic, Optical and Magnetic Materials, Lens (optics), Chemistry, chemistry, Optoelectronics, Làsers de semiconductors, 0210 nano-technology, business
Abstract

Open access DOI: 10.1364/OME.6.000046 URL: https://www.osapublishing.org/ome/abstract.cfm?uri=ome-6-1-46 Filiació URV: SI Continuous-wave microchip laser operation and thermal lensing are studied for Yb-doped gallium garnets, Yb:LuGG, Yb:YGG, Yb:CNGG and Yb:CLNGG under diode-pumping at ~932 and 969 nm. It is shown that although thermal the conductivity of Ga garnets is lower than that of Yb:YAG, the compromised thermo-optic properties, high absorption in the zero-phonon line and low internal loss make the ordered Yb:YGG and Yb:LuGG crystals to be promising for compact highly efficient microchip lasers. In particular, Yb:LuGG microchip laser generated 8.97 W of output power with a slope efficiency η = 75% and 9.31 W with η = 65%, for pumping at 932 and 969 nm, respectively. Multi-watt output in the range 1039–1078 nm is emitted for different transmission of the output coupler. The sensitivity factor of the thermal lens for this crystal is 2.1 m−1/W (pumping at 969 nm with a pump waist radius of 100 μm) and the estimated thermal conductivity is 5.8 ± 0.5 W/mK. Power scaling of Yb:CNGG and Yb:CLNGG microchip lasers is limited by poor thermo-optic properties and high internal losses. Ordered Ga garnets show good prospects for the development of passively Q-switched microchip lasers with high pulse energies.

Published
2015
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27. Sub-nanosecond Tm:KLuW Microchip Laser Q-switched by a Cr:ZnS Saturable Absorber

Author

Francesc Díaz, Josep Maria Serres, Uwe Griebner, Pavel Loiko, Konstantin Yumashev, Valentin Petrov, Anatol Yasukevich, Magdalena Aguiló, and Xavier Mateos

Subjects
Materials science, Optics, business.industry, Slope efficiency, Optoelectronics, Saturable absorption, Microchip laser, Nanosecond, business
Abstract

A Tm:KLu(WO4)2 microchip laser Q-switched by a Cr2+:ZnS saturable absorber generates 780 ps / 26 μJ pulses at 1846.6 nm. The maximum output power is 146 mW with a slope efficiency of 21%.

Published
2015
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28. Oriented Single-Walled Carbon Nanotubes as Saturable Absorber for Passive Q-Switching of a Tm:KLuW Microchip Laser

Author

Pavel Loiko, Francesc Díaz, Luis B. Modesto-López, Josep Maria Serres, Valentin Petrov, Xavier Mateos, Konstantin Yumashev, Joan Rosell-Llompart, Uwe Griebner, Joan J. Carvajal, and Magdalena Aguiló

Subjects
Materials science, business.industry, Slope efficiency, Pulse duration, Saturable absorption, Microchip laser, Carbon nanotube, Laser, Q-switching, law.invention, Power (physics), Optics, law, Optoelectronics, business
Abstract

A Tm:KLuW laser is Q-switched with a saturable absorber based on aligned SWCNTs, generating a maximum average output power of 260 mW with a slope efficiency of 12%. The shortest pulse duration is 97 ns.

Published
2015
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29. Graphene-Based Saturable Absorber for Passive Q-switching of Tm:KLu(WO4)2 Microchip Laser

Author

Pavel Loiko, Konstantin Yumashev, Francesc Díaz, Josep Maria Serres, Uwe Griebner, Valentin Petrov, Magdalena Aguiló, and Xavier Mateos

Subjects
Materials science, Pulse (signal processing), business.industry, Graphene, Pulse duration, Nonlinear optics, Saturable absorption, Microchip laser, Q-switching, law.invention, Optical pumping, Optics, law, Optoelectronics, business
Abstract

A diode-pumped Q-switched Tm:KLu(WO 4 ) 2 microchip laser generated a maximum average output power of 310 mW with M2 < 1.2 at 1947 nm. The shortest pulse duration was 285 ns at a pulse repetition rate of 190 kHz.

Published
2015
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30. Inband-Pumped Ho:KLu(WO4)2 Microchip Laser Q-switched with a PbS-Quantum-Dot-Doped Glass

Author

Francesc Díaz, Alexander M. Malyarevich, Magdalena Aguiló, Uwe Griebner, Pavel Loiko, A. A. Onushchenko, Xavier Mateos, Valentin Petrov, Josep Maria Serres, and Konstantin Yumashev

Subjects
Materials science, business.industry, Quantum dot, Optical materials, Slope efficiency, Doping, Optoelectronics, Pulse duration, Nonlinear optics, Microchip laser, business, Absorption (electromagnetic radiation)
Abstract

Maximum average output power of 84 mW, slope efficiency of 42%, and pulse duration of 55 ns are achieved at 2.06 μm with a passively Q-switched Ho:KLu(WO 4 ) 2 microchip laser inband-pumped by a Tm:KLu(WO 4 ) 2 microchip laser.

Published
2015
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31. Microchip Laser Operation of Yb:YCOB Crystals

Author

Magdalena Aguiló, Pavel Loiko, Valentin Petrov, Uwe Griebner, Francesc Díaz, Haohai Yu, Junhai Liu, Xavier Mateos, Josep Maria Serres, Huaijin Zhang, and Konstantin Yumashev

Subjects
Materials science, business.industry, Slope efficiency, Second-harmonic generation, Microchip laser, Laser, law.invention, Crystal, Optics, Light propagation, law, Fiber laser, Optoelectronics, business, Laser beams
Abstract

Microchip lasers are realized with Yb:YCOB crystals cut along the optical indicatrix axes. Using a Z-cut crystal, a maximum output power of 8.35 W is achieved at ~1040 nm with a slope efficiency of 70%.

Published
2015
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32. Optimizing Yb:CaGdAlO4 crystal for high power lasers

Author

Pavel Loiko, Bruno Viana, Patrick Georges, Konstantin Yumashev, and Frédéric Druon

Subjects
Crystal, Materials science, High power lasers, business.industry, law, Fiber laser, Optoelectronics, business, Laser, Laser beams, law.invention
Abstract

Precise thermo-optical characterization of Yb:CaGdAlO4, including principal thermo-optic coefficients (dno/dT dne/dT), allows to explain mode-instabilities observed at very high power in lasers using this crystal and to optimize the orientation of Yb:CALGO for athermal operation.

Published
2014
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33. Thermal Lensing in Yb:KLu(WO4)2 Laser Crystal

Author

Pavel Loiko, Konstantin Yumashev, N. V. Kuleshov, and Anatoly Pavlyuk

Subjects
Materials science, business.industry, Crystal orientation, Laser, Molecular physics, Thermal expansion, law.invention, Lens (optics), Crystal, Optics, law, Thermal, Thermal lensing, business, Monoclinic crystal system
Abstract

Thermal lens properties are determined for monoclinic Yb:KLu(WO4)2 crystals cut along the axes of optical indicatrix, Np, Nm and Ng, under diode-pumping, on the basis of measured thermo-optic coefficients, dn/dT, and thermal expansion ones.

Published
2013
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