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276 results on '"Sujecki, S."'

1. Modelling and design of lanthanide ion doped chalcogenide fiber lasers: progress towards the practical realization of the first MIR chalcogenide fiber laser

Author

Sujecki, S

Subjects
Physics - Optics, 00A79, J.2
Abstract

This paper presents the progress in the fields of the modelling and design of lanthanide ion doped chalcogenide glass fiber lasers. It presents the laser cavity designs that have been developed in order to optimize the performance of lanthanide ion doped chalcogenide glass fiber lasers. Also various numerical algorithms that have been applied for the optimization of chalcogenide glass lasers are reviewed and compared. The comparison shows that a combination of less accurate but more robust algorithms with more accurate ones gives the most promising performance., Comment: 14 pages, 12 figures

Published
2021

2. A study of MIR photoluminescence from Pr$^{3+}$ doped chalcogenide fibers pumped at near-infrared wavelengths

Author

Sujecki, S., Sojka, L., Beres-Pawlik, E., Piramidowicz, R., Sakr, H., Tang, Z., Barney, E., Furniss, D., Benson, T. M., and Seddon, A. B.

Subjects
Physics - Optics, 00A79, J.2
Abstract

We perform a numerical analysis of mid-infrared photoluminescence emitted by praseodymium (III) doped chalcogenide selenide glass pumped at near-infrared wavelengths. The results obtained show that an effective inversion of level populations can be achieved using both 1480 nm and 1595 nm laser diodes. The rate of the spontaneous emission achieved when pumping at 1480 nm and 1595 nm is comparable to this achieved using the standard pumping wavelength of 2040 nm., Comment: 7 pages, 8 figures

Published
2021

3. Breaking through the wavelength barrier: The state-of-play on rare-earth ion, mid-infrared fiber lasers for the 4–10 μm wavelength region

Author

Seddon, A.B., primary, Sojka, L., additional, Shen, M., additional, Tang, Z.Q., additional, Furniss, D., additional, Barney, E., additional, Sakr, H., additional, Jayasuriya, D., additional, Parnell, H., additional, Butterworth, J., additional, Crane, R.W., additional, Nunes, J.J., additional, Mabwa, D.P., additional, Farries, M., additional, Phang, S., additional, Benson, T.M., additional, and Sujecki, S., additional

Published
2022
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4. Contributors

Author

Adam, Jean Luc, primary, Alvarez, Oseas, additional, Ams, Martin, additional, Aydin, Yigit Ozan, additional, Bang, Ole, additional, Barney, E., additional, Benson, T.M., additional, Bernier, Martin, additional, Bharathan, Gayathri, additional, Boilard, Tommy, additional, Busse, Lynda E., additional, Butterworth, J., additional, Chenard, François, additional, Cozic, Solenn, additional, Crane, R.W., additional, Ebendorff-Heidepriem, Heike, additional, Farries, M., additional, Fortin, Vincent, additional, Fuerbach, Alex, additional, Furniss, D., additional, Gattass, Rafael R., additional, Gorjan, Martin, additional, Henderson-Sapir, Ori, additional, Hudson, Darren, additional, Jackson, Stuart, additional, Jayasuriya, D., additional, Jobin, Frédéric, additional, Kang, Myungkoo, additional, Kang, Zhe, additional, Li, Jianfeng, additional, Luo, Hongyu, additional, Mabwa, D.P., additional, Maes, Frédéric, additional, Majewski, Matthew R., additional, Nunes, J.J., additional, Ottaway, David J., additional, Parnell, H., additional, Petersen, Christian Rosenberg, additional, Phang, S., additional, Pleau, Louis-Philippe, additional, Poulain, Marcel, additional, Qin, Guanshi, additional, R. Majewski, Mathew, additional, Richardson, Kathleen A., additional, Rochette, Martin, additional, Sakr, H., additional, Sanghera, Jasbinder S., additional, Seddon, A.B., additional, Shaw, L. Brandon, additional, Shen, M., additional, Sojka, L., additional, Sujecki, S., additional, Talbot, Lauris, additional, Tang, Z.Q., additional, Tokita, Shigeki, additional, Vallée, Réal, additional, Wang, Pengfei, additional, and Woodward, Robert I., additional

Published
2022
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5. The Modelling of Fibre Lasers for Mid-Infrared Wavelengths

Author

Sojka, L., Benson, T. M., Furniss, D., Tang, Z., Sakr, H., Seddon, A. B., Sujecki, S., Adibi, Ali, Series editor, Asakura, Toshimitsu, Series editor, Hänsch, Theodor W., Series editor, Krausz, Ferenc, Series editor, Masters, Barry R., Series editor, Monemar, Bo A.J., Series editor, Venghaus, Herbert, Series editor, Weber, Horst, Series editor, Weinfurter, Harald, Series editor, Midorikawa, Katsumi, Series editor, Rhodes, William T., Editor-in-chief, Agrawal, Arti, editor, Benson, Trevor, editor, De La Rue, Richard M., editor, and Wurtz, Gregory A., editor

Published
2017
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15. Room temperature mid-infrared fiber lasing beyond 5 µm in chalcogenide glass small-core step index fiber

Author

Nunes, J. J., primary, Sojka, Ł., additional, Crane, R. W., additional, Furniss, D., additional, Tang, Z. Q., additional, Mabwa, D., additional, Xiao, B., additional, Benson, T. M., additional, Farries, M., additional, Kalfagiannis, N., additional, Barney, E., additional, Phang, S., additional, Seddon, A. B., additional, and Sujecki, S., additional

Published
2021
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28. Modeling of resonantly pumped mid-infrared Pr3+-doped chalcogenide fiber amplifier with different pumping schemes

Author

Shen, M., Furniss, David, Tang, Z., Barney, Emma R., Sujecki, S., Benson, Trevor M., and Seddon, Angela B.

Abstract

We propose a model for resonantly pumped Pr3+-doped chalcogenide fiber amplifiers which includes excited state absorption and the full spectral amplified spontaneous emission spanning from 2 ?m to 6 ?m. Based on this model, the observed near- and mid-infrared photoluminescence generated from Pr3+-doped chalcogenide fiber is explained. Then the output properties of a 4.1 ?m resonantly pumped Pr3+-doped chalcogenide fiber amplifier are simulated in both co- and counter-pumping schemes. Results show that the 4.1 ?m counter-pumped fiber amplifier can achieve a power conversion efficiency (PCE) of over 62.8 % for signal wavelengths ranging from 4.5 ?m to 5.3 ?m. This is, to our best knowledge, the highest simulated PCE for a Pr3+-doped chalcogenide fiber amplifier.

Published
2018

32. Numerical modelling of Tb3+ doped selenide-chalcogenide multimode fibre based spontaneous emission sources

Author

Sujecki, S., Bere?-Pawlik, E., Sakr, Hesham, Tang, Z., Barney, Emma R., Furniss, David, Benson, Trevor M., and Seddon, Angela B.

Subjects
Low phonon energy glasses, Physics::Optics, Astrophysics::Cosmology and Extragalactic Astrophysics, Fibre laser modelling, Mid-infrared light, Condensed Matter::Disordered Systems and Neural Networks, Astrophysics::Galaxy Astrophysics, Fibre lasers
Abstract

A model is developed of a terbium (III) ion doped selenide chalcogenide glass fibre source that provides spontaneous emission within the mid-infrared (MIR) wavelength range. Three numerical algorithms are used to calculate the solution and compare their properties.

Published
2017

33. Room temperature mid-infrared fiber lasing beyond 5??µm in chalcogenide glass small-core step index fiber

Author

Nunes, J. J., Sojka, Ł., Crane, R. W., Furniss, D., Tang, Z. Q., Mabwa, D., Xiao, B., Benson, T. M., Farries, M., Kalfagiannis, N., Barney, E., Phang, S., Seddon, A. B., and Sujecki, S.

Abstract

This Letter, to the best of our knowledge, reports mid-infrared fiber lasing beyond 5 µm at room temperature for the first time, Ce^3+-doped, chalcogenide glass, step index fiber employed in-band pumping with a 4.15 µm quantum cascade laser. The lasing fiber is was 64 mm long, with a calculated numerical aperture of 0.48 at the lasing wavelengths. The core glass was Ge_15As_21Ga_1Se_63 atomic % (at. %), doped with 500 parts-per-million-by-weight Ce, with a 9 µm core diameter. The cladding glass was Ge_21Sb_10Se_69 at. % with a 190 µm outer diameter. As pump power increases continuous wave lasing corresponding to the ^2F_7/2?^2F_5/2, transition in the Ce^3+ ion occurs at 5.14 µm, 5.17 µm, and 5.28 µm.

Published
2021

36. Reliability assessment and degradation analysis of 1.3 μm GaInNAs lasers.

Author

Lu, W., Bull, S., Lim, J. J., MacKenzie, R., Sujecki, S., Andrianov, A. V., Sadeghi, M., Wang, S. M., Larsson, A., Melanen, P., Sipilä, P., Uusimaa, P., Foxon, C. T., and Larkins, E. C.

Subjects
LASERS, OPTICAL materials, GALLIUM compounds, INDIUM compounds, NITROGEN compounds, ARSENIC compounds
Abstract

The degradation of 1.3 μm GaInNAs lasers was investigated using accelerated aging tests. This was followed by comprehensive characterization, including standard light-current-voltage (L-I-V) characterization, capacitance measurements, photoluminescence microscopy (PLM), on-axis amplified spontaneous emission (ASE) spectra measurements, and photocurrent (PC) and electroluminescence (EL) spectroscopies. The slope efficiency of the device dropped by 50% with a 300% increase in the threshold current after the accelerated aging test. The ideality factors of the aged devices are higher than those of the unaged devices. PLM images showed no evidence of catastrophic optical mirror damage. The measured capacitances of the aged devices are all similar to those of the unaged devices, indicating that there was no significant dopant diffusion in the junction region. Fourier transforms of the ASE spectra showed that no intracavity defects were present in the aged lasers, suggesting that intracavity defects are not responsible for the rapid degradation of the aged devices. Although the PC measurements showed defects at 0.88–0.95 eV and at ∼0.76 eV, these defect signatures did not increase with aging. On the other hand, EL measurements revealed that radiative deep level defects were generated during the aging tests, which may be related to the degradation of the devices. Based on the above measurement results, we identify the generation of radiative deep level defects as the main causes of degradation of these devices. [ABSTRACT FROM AUTHOR]

Published
2009
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38. Numerical modeling of lathanide-ion doped fibre lasers operating within mid-infrared wavelength region

Author

Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., and Fuhrberg, P.

Subjects
Physics::Optics
Abstract

We discuss the numerical modelling of lanthanide-ion doped chalcogenide glass fibre lasers for operation in the mid-infrared wavelength region. We extract the modelling parameters from emission and absorption measurements using Judd-Ofelt and McCumber theory. Numerical algorithms are developed based on the experimentally extracted fibre parameters. The simulation results predict lasing with slope efficiency of at least 20 % provided, that the fibre loss can be kept at the level of 1 dB/m or less.

Published
2016

39. True mid-infrared Pr3+ absorption cross-section in a selenide-chalcogenide host-glass

Author

Seddon, Angela B., Furniss, David, Tang, Z.Q., Sójka, L., Benson, Trevor M., Caspary, R., and Sujecki, S.

Abstract

The mid-infrared (MIR) spans the 3-25 m wavelength range. Rare-earth-ion doped selenide-chalcogenide glasses are being developed for direct-emission MIR fibre lasers. The true Pr3+ absorption cross-section in the 3.5-6 µm wavelength region of a Pr3+-doped (500 ppmw of Pr3+ i.e. 9.47 x 1019 Pr3+ ions cm-3) GeAsGaSe host-glass is presented, after numerically removing the underlying, extrinsic vibrational absorption due to [H-Se-] contamination of the host-glass.

Published
2016

41. Reliability assessment and degradation analysis of 1.3 [micro]m GaInNAs lasers

Author

Lu, W., Bull, S., Lim, J.J., MacKenzie, R., Sujecki, S., Andrianov, A.V., Sadeghi, M., Wang, S.M., Larsson, A., Melanen, P., Sipila, P., Uusimaa, P., Foxon, C.T., and Larkins, E.C.

Subjects
Gallium arsenide -- Electric properties, Gallium arsenide -- Optical properties, Indium -- Electric properties, Indium -- Optical properties, Photoelectron spectroscopy -- Usage, Electroluminescence -- Measurement, Physics
Abstract

The degradation of 1.3 [micro]m GaIn NAs lasers is examined by using accelerated aging tests. The results have helped in identifying the generation of radiative deep level defects as the main causes of degradation of these uncaged devices.

Published
2009

50. Characterising refractive index dispersion in chalcogenide glasses

Author

Fang, Y., Sojka, L., Jayasuriya, D., Furniss, D., Tang, Z. Q., Markos, Christos, Sujecki, S., Seddon, A. B., Benson, T. M., Fang, Y., Sojka, L., Jayasuriya, D., Furniss, D., Tang, Z. Q., Markos, Christos, Sujecki, S., Seddon, A. B., and Benson, T. M.

Abstract

Much effort has been devoted to the study of glasses that contain the chalcogen elements (sulfur, selenium and tellurium) for photonics' applications out to MIR wavelengths. In this paper we describe some techniques for determining the refractive index dispersion characteristics of these glasses. Knowledge of material dispersion is critical in delivering step-index fibres including with high numerical aperture for mid-infrared supercontinuum generation.

Published
2016

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