0518367 - ÚFE 2020 RIV US eng J - Článek v odborném periodiku
Kamrádek, Michal - Kašík, Ivan - Aubrecht, Jan - Mrázek, Jan - Podrazký, Ondřej - Cajzl, Jakub - Vařák, Petr - Kubeček, V. - Peterka, Pavel - Honzátko, Pavel
Nanoparticle and Solution Doping for Efficient Holmium Fiber Lasers.
IEEE Photonics Journal. Roč. 11, č. 5 (2019), č. článku 7103610. ISSN 1943-0655. E-ISSN 1943-0647
Grant CEP: GA ČR(CZ) GA17-20049S
Institucionální podpora: RVO:67985882
Klíčová slova: Fiber laser * infrared fibers
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 2.833, rok: 2019 ; AIS: 0.605, rok: 2019
Způsob publikování: Open access
Web výsledku:
https://ieeexplore.ieee.org/document/8831379DOI: https://doi.org/10.1109/JPHOT.2019.2940747

Efficient holmium fiber lasers have been studied as attractive laser sources operating around 2.1 mu m. We report on holmium-doped silica fibers prepared by the modified chemical vapor deposition in combination with either a solution-doping method or a nanoparticle-doping method. A set of 15 fibers with various compositions was characterized and compared with respect to their fluorescence lifetime, laser slope efficiency and laser threshold. This set of fibers in wide concentration ranges allowed us to assess reliably the influence of material composition and the influence of doping method. The best-performance fibers exhibited slope efficiency 83.1%, laser threshold 155 mW and a record value of upper laser level lifetime of 1.35 ms. These results were achieved in fibers with holmium concentration lower than 800 molar ppm and Al/Ho molar ratio greater than 70. Significant differences between fibers prepared by solution doping and nanoparticle doping were not observed. The behavior of Al2O3 nanoparticles during fiber preparation is discussed in details
Trvalý link: http://hdl.handle.net/11104/0303523