Tm-doping concentration influence on Tm:GGAG lasing and tenability at 2 μm spectral region

0521940 - FZÚ 2020 US eng A - Abstract
Kratochvíl, J. - Boháček, P. - Šulc, J. - Němec, M. - Fibrich, M. - Jelínková, H. - Trunda, Bohumil - Havlák, Lubomír - Jurek, Karel - Nikl, Martin
Tm-doping concentration influence on Tm:GGAG lasing and tenability at 2 μm spectral region.
Proceedings of the European Conference on Lasers and Electro-Optics (CLEO 2019). New York: IEEE, 2019. s. 46-46. ISBN 978-1-7281-0469-0.
[The European Conference on Lasers and Electro-Optics 2019. 23.06.2019-27.06.2019, Munich]
Institutional support: RVO:68378271
Keywords : gadolinium gallium aluminium garnet * tunability parameters
OECD category: Optics (including laser optics and quantum optics)

Tm3+ doped mixed gadolinium-gallium-aluminium-garnet (GGAG) is investigated. Focus is given to the Tm3+ concentration dependence of lasing and tunability parameters. The Tm:GGAG crystal was grown using Czochralski method in a slightly oxidative atmosphere. Five planeparallel face-polished Tm:GGAG samples with concentrations varying from 1.4 at.% to 8.4 at.% (Tm/Gd) and thicknesses ranging from 2.7 mm to 3.6 mm were cut from the crystal. The samples were longitudinally pumped by fiber coupled (core diam. 400 μm, NA = 0.22) laser diode at wavelength 785 nm in QCW regime (pulse length 5 ms, repetition rate 10 Hz). The 145 mm resonator consisted of a flat pumping mirror (HR @ 1.85–2.11 μm, HT @ 0.78 μm) and concave output coupler (r = 150 mm, R = 97.5 % @1.8 – 2.10 μm). For the wavelength tuning, 1.5 mm thick birefringent SiO2 plate was inserted in the cavity at the Brewster’s angle.

Permanent Link: http://hdl.handle.net/11104/0306497