Temperature-dependence of cross-relaxation coefficient of the thulium-doped silica fibers

0584358 - ÚFE 2024 RIV US eng C - Conference Paper (international conference)
Jiříčková, Bára - Schreiber, Ondřej - Vařák, Petr - Grábner, Martin - Aubrecht, Jan - Peterka, Pavel
Temperature-dependence of cross-relaxation coefficient of the thulium-doped silica fibers.
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 12573. Bellingham: SPIE, 2023 - (Kalli, K.; Mendez, A.; Peterka, P.), č. článku 125730H. ISBN 978-151066266-7. ISSN 0277-786X. E-ISSN 1996-756X.
[The International Society for Optical Engineering-Specialty Optical Fibres 2023. Praha (CZ), 24.04.2023-27.04.2023]
R&D Projects: GA ČR(CZ) GA23-05701S
Institutional support: RVO:67985882
Keywords : cross-relaxation coefficient * numerical model * spectroscopy * temperature effect * thulium * thulium-doped silica fibers
OECD category: Optics (including laser optics and quantum optics)
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12573/125730H/Temperature-dependence-of-cross-relaxation-coefficient-of-the-thulium-doped/10.1117/12.2666642.short

Nowadays, the main limiting factor of power scaling of high-power thulium fiber lasers is high heat load causing thermal mode instability (TMI) and other thermally induced difficulties. Increased temperature of the fiber core also leads to large changes of its spectroscopic parameters. In this work, we present the experimental measurements of the temperature dependence of the fluorescence lifetime of the thulium-doped fibers. The results of the temperature-dependent fluorescence lifetime, absorption and emission cross-section spectra, and energy transfer coefficient k3011, which characterizes so-called “two-for-one” cross-relaxation process3H43H6 →3F43F4, were employed to develop a numerical model for simulation and optimization of high-power thulium-doped fiber lasers and amplifiers with temperature-dependent fiber characteristics
Permanent Link: https://hdl.handle.net/11104/0352278