0603256 - ÚFE 2025 RIV US eng J - Journal Article
Grábner, Martin - Švejkarová, Bára - Aubrecht, Jan - Peterka, Pavel
Analytical Model of Thulium-Doped Fiber Laser Pumped by Two-for-One Process.
Journal of Lightwave Technology. Roč. 42, č. 8 (2024), s. 2938-2944. ISSN 0733-8724. E-ISSN 1558-2213
R&D Projects: GA ČR(CZ) GA23-05701S
Institutional support: RVO:67985882
Keywords : cross-relaxation * fiber laser model * Tm-doped fiber * two-for-one process
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 4.1, year: 2023 ; AIS: 0.811, rok: 2023
Method of publishing: Limited access
Result website:
https://ieeexplore.ieee.org/document/10366807DOI: https://doi.org/10.1109/JLT.2023.3345001

Analytical models of rare-earth-doped fiber lasers were proposed in the past as very efficient yet reliable alternative to comprehensive numerical models. Cross-relaxation in thulium-doped fiber lasers has a great impact on their efficiency through a two-for-one process but it has not been addressed in analytical models so far. Here, the analytical model of thulium-doped fiber laser is proposed that respects the cross-relaxation mechanism of a type: 3H4→3F4, 3H6→3F4. The model is based on a two-level model and enables to express the threshold power and slope efficiency in a closed form. The effect of intrinsic losses is modeled by a physically motivated semi-empirical formula. The model is compared with the numerical one and with experimental data. Its application limits are discussed. An approximate method for checking validity conditions of the model is proposed
Permanent Link: https://hdl.handle.net/11104/0360461