Tm, Ho:GGAG crystal for 2.1 μm tunable diode-pumped laser

Jan Kratochvíl; Pavel Boháček; Jan Šulc; Michal Němec; Martin Fibrich; Helena Jelínková; Bohumil Trunda; Lubomír Havlák; Karel Jurek; Martin Nikl

doi:10.1117/12.2520906

26 April 2019 Tm, Ho:GGAG crystal for 2.1 μm tunable diode-pumped laser

Jan Kratochvíl, Pavel Boháček, Jan Šulc, Michal Němec, Martin Fibrich, Helena Jelínková, Bohumil Trunda, Lubomír Havlák, Karel Jurek, Martin Nikl

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Proceedings Volume 11033, High-Power, High-Energy, and High-Intensity Laser Technology IV; 110330H (2019) https://doi.org/10.1117/12.2520906
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

The spectroscopy properties and wavelength tunability of diode pumped laser based on Tm³⁺, Ho³⁺ co-doped (Gd_3-xGax)(Ga_5-y Al_y)O₁₂ mixed gadolinium-gallium-aluminium garnet (Tm, Ho:GGAG) single crystal were investigated. A fiber (core diameter 400 μ m, NA = 0.22) coupled laser diode was used for longitudinal pumping of Tm, Ho:GGAG crystals. The laser diode was operating in the pulsed regime (5 ms pulse length, 10 Hz repetition rate, 785 nm emission wavelength, maximum power amplitude 16.8 W). The 150 mm long hemi- spherical laser resonator consisted of a flat pumping mirror (HR @ 1.852.11 μm, HT @ 0.78 μm) and concave (r = 150 mm) output coupler with a reflectivity of ≈97% @1.8 2.10 m. Wavelength tuning was accomplished by using 1.5 mm thick SiO₂ birefringent plate. For the sample with 3.97 at.% Tm, 0.38 at.% Ho concentration, the measured maximal output power amplitude was 1.04 W at 2086 nm with a slope efficiency of 23.6 % and the tunability range 19862110 nm (124 nm). For the sample with 7.65 at.% Tm, 0.68 at .% Ho concentrations, the measured maximal output power amplitude was 2.30 W at 2090 nm with a slope efficiency of 26.5 % and the tunability range 20032116 nm (113 nm).

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Jan Kratochvíl, Pavel Boháček, Jan Šulc, Michal Němec, Martin Fibrich, Helena Jelínková, Bohumil Trunda, Lubomír Havlák, Karel Jurek, and Martin Nikl "Tm, Ho:GGAG crystal for 2.1 μm tunable diode-pumped laser", Proc. SPIE 11033, High-Power, High-Energy, and High-Intensity Laser Technology IV, 110330H (26 April 2019); https://doi.org/10.1117/12.2520906

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