0603146 - ÚFE 2026 RIV NL eng J - Journal Article
Kamrádek, Michal - Kašík, Ivan - Aubrecht, Jan - Vařák, Petr - Podrazký, Ondřej - Bartoň, Ivo - Pokorný, Jan - Peterka, Pavel - Honzátko, Pavel
Nanoparticle doping as a way to enhance holmium fiber lasers efficiency.
Optics Communications. Roč. 575, 15 Jan (2025), č. článku 131290. ISSN 0030-4018. E-ISSN 1873-0310
R&D Projects: GA ČR(CZ) GA23-05701S; GA MŠMT(CZ) EH22_008/0004573
Grant - others:German Academic Exchange Service(DE) DAAD-23-07
Program: Bilaterální spolupráce
Institutional support: RVO:67985882
Keywords : optical-fibers * fabrication * nanoparticles
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.2, year: 2023 ; AIS: 0.36, rok: 2023
Method of publishing: Limited access
Result website:
https://www.sciencedirect.com/science/article/pii/S0030401824010277?via%3DihubDOI: https://doi.org/10.1016/j.optcom.2024.131290

Highly-doped holmium fibers have been prepared using modified chemical vapor deposition in combination with nanoparticle-doping method. Within a series of various Al2O3 and Ho3+ concentrations, relations between fibers composition and their fluorescence and laser parameters have been studied. Al/Ho molar ratio equal to at least 50 was found to be the key factor for fibers with outstanding parameters. Fibers with slope efficiency above 80%, laser threshold below 100 mW and fluorescence lifetime up to 1.6 ms have been prepared. Thanks to high Al2O3 concentrations, obtained through nanoparticle doping, we were able to achieve highperformance fibers in a wide range of Ho3+ concentrations. An output power of 19 W with 81% slope efficiency was reached using fiber with almost 4000 ppm of Ho3+ and 10 mol.% of Al2O3. This result is encouraging for highly efficient high-power cladding-pumped holmium fiber lasers, and studied relations between fibers composition and their laser parameters will be used in the designing of such laser sources.
Permanent Link: https://hdl.handle.net/11104/0360463