Tm:GGAG crystal for 2µm tunable diode-pumped laser

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

doi:10.1117/12.2227641

27 April 2016 Tm:GGAG crystal for 2μm tunable diode-pumped laser

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

Author Affiliations +

Proceedings Volume 9893, Laser Sources and Applications III; 98930H (2016) https://doi.org/10.1117/12.2227641
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

The spectroscopy properties and wavelength tunability of diode pumped laser based on Tm-doped mixed gadolinium-gallium-aluminium garnet Gd₃(Ga_xAl_1-x)₅O₁₂ (Tm:GGAG) single crystal were investigated for the first time. The crystal was grown by Czochralski method in a slightly oxidative atmosphere using an iridium crucible. The tested Tm:GGAG sample was cut from the grown crystal boule perpendicularly to growth direction (c-axis). The composition of sample was determined using electron microprobe X-ray elemental analysis. For spectroscopy and laser experiments 3.5mm thick plane-parallel face-polished plate (without AR coatings) with composition Gd_2.76Tm_0.0736Ga_2.67Al_2.50O₁₂ (2.67 at.% Tm/Gd) was used. A fiber (core diameter 400 μm, NA= 0.22) coupled laser diode (emission wavelength 786 nm) was used for longitudinal Tm:GGAG pumping. The laser diode was operating in the pulsed regime (10 ms pulse length, 10 Hz repetition rate, maximum power amplitude 18 W). The 145mm long semi-hemispherical laser resonator consisted of a flat pumping mirror (HR @ 1.8- 2.10 μm, HT @ 0.78 μm) and curved (r = 150mm) output coupler with a reflectivity of » 97% @ 1.8- 2.10 µm. The maximum laser output power amplitude 1.14W was obtained at wavelength 2003nm for absorbed pump power amplitude 4.12W. The laser slope efficiency was 37% in respect to absorbed pumping power. Wavelength tuning was accomplished by using 2mm thick MgF₂ birefringent filter placed inside the laser resonator at the Brewster angle. The laser was continuously tunable over 180nm in a spectral region from 1856nm to 2036 nm.

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Jan Šulc, Pavel Boháček, Michal Němec, Martin Fibrich, Helena Jelínková, Bohumil Trunda, Lubomír Havlák, Karel Jurek, and Martin Nikl "Tm:GGAG crystal for 2μm tunable diode-pumped laser", Proc. SPIE 9893, Laser Sources and Applications III, 98930H (27 April 2016); https://doi.org/10.1117/12.2227641

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