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Tm, Ho:GGAG crystal for 2.1 μm tunable diode-pumped laser
Author(s): Jan Kratochvíl; Pavel Boháček; Jan Šulc; Michal Němec; Martin Fibrich; Helena Jelínková; Bohumil Trunda; Lubomír Havlák; Karel Jurek; Martin Nikl
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Paper Abstract

The spectroscopy properties and wavelength tunability of diode pumped laser based on Tm3+, Ho3+ co-doped (Gd3-xGax)(Ga5-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).

Paper Details

Date Published: 26 April 2019
PDF: 11 pages
Proc. SPIE 11033, High-Power, High-Energy, and High-Intensity Laser Technology IV, 110330H (26 April 2019); doi: 10.1117/12.2520906
Show Author Affiliations
Jan Kratochvíl, Czech Technical Univ. in Prague (Czech Republic)
Pavel Boháček, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Jan Šulc, Czech Technical Univ. in Prague (Czech Republic)
Michal Němec, Czech Technical Univ. in Prague (Czech Republic)
Martin Fibrich, Czech Technical Univ. in Prague (Czech Republic)
Helena Jelínková, Czech Technical Univ. in Prague (Czech Republic)
Bohumil Trunda, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Lubomír Havlák, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Karel Jurek, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Martin Nikl, Institute of Physics of the CAS, v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 11033:
High-Power, High-Energy, and High-Intensity Laser Technology IV
Joachim Hein; Thomas J. Butcher, Editor(s)

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