Tm-fiber laser resonantly pumped by 1.7 um laser diode

Jan Šulc; Michal Němec; Jan Kratochvíl; Helena Jelínková

doi:10.1117/12.3000072

12 March 2024 Tm-fiber laser resonantly pumped by 1.7 μm laser diode

Jan Šulc, Michal Němec, Jan Kratochvíl, Helena Jelínková

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 128651A (2024) https://doi.org/10.1117/12.3000072
Event: SPIE LASE, 2024, San Francisco, California, United States

Conference Poster

Abstract

Thulium-doped double-clad fiber (Nufern, LMA-TDF-25/250, 3 m long) based laser was tested under resonant excitation. As a source of pumping radiation at 1.7 μm a fiber-coupled laser diode was used (fiber diameter 400 μm, maximum power 25 W). Fiber laser resonator consisted of dichroic (high reflectivity at 2 μm, high transparency at 1.7 μm) free-space plane mirror, placed between lenses used to collimate and to focus the pumping radiation, and Fresnell reflection of active fiber end which serves as an output coupler. Under CW pumping this Tm-laser generated laser radiation at wavelength 1972 nm with power up to 4.5W for absorbed pumping power 11W. The laser efficiency in respect to absorbed pumping power was 63 % in this simple configuration. The goal of our work is to attract attention to the possibility of pumping thulium fiber lasers resonantly using laser diodes that are already readily available today. Thanks to resonance pumping, compared to cross-relaxation pumping at 0.8 μm, it can be achieved higher efficiency and lower heat generation, which can help to reach high mean powers from thulium fiber lasers. An important fact is that both the generated laser radiation and pumping radiation belong to the eye-safe spectral region, which reduces the risk of vision damage.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jan Šulc, Michal Němec, Jan Kratochvíl, and Helena Jelínková "Tm-fiber laser resonantly pumped by 1.7 μm laser diode", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 128651A (12 March 2024); https://doi.org/10.1117/12.3000072

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