M. Kamrádek,1,2 I. Kašík,1 J. Aubrecht,1 J. Mrázek,1 O. Podrazkýhttps://orcid.org/0000-0003-4255-9366,1 J. Cajzl,1,3 P. Varák,1,3 V. Kubeček,2 P. Peterka,1 P. Honzátko1
1Institute of Photonics and Electronics of the CAS, v.v.i. (Czech Republic) 2Czech Technical Univ. in Prague (Czech Republic) 3Univ. of Chemistry and Technology Prague (Czech Republic)
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Holmium-doped silica-based optical fibers belong to intensively studied materials for fiber laser sources operating around 2.1 μm. In this contribution, we deal with silica-based optical fibers doped with holmium and aluminum oxide. The fibers were prepared by the modified chemical vapor deposition method combined either with a solution doping or a nanoparticle doping. A large set of fibers with various dopant concentrations was characterized related to their fluorescence lifetime, laser threshold and slope efficiency. The best-performance fibers exhibited a fluorescence lifetime longer than 1 ms, a laser threshold under 200 mW and a slope efficiency around 80%. These characteristics are discussed regarding the doping method and dopant concentrations.
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M. Kamrádek, I. Kašík, J. Aubrecht, J. Mrázek, O. Podrazký, J. Cajzl, P. Varák, V. Kubeček, P. Peterka, P. Honzátko, "Holmium-doped optical fibers for efficient fiber lasers," Proc. SPIE 11355, Micro-Structured and Specialty Optical Fibres VI, 113550C (1 April 2020); https://doi.org/10.1117/12.2559176