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Proceedings Paper

Tm:GGAG crystal for 2μm tunable diode-pumped laser
Author(s): Jan Šulc; Pavel Boháček; 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 Tm-doped mixed gadolinium-gallium-aluminium garnet Gd3(GaxAl1-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 Gd2.76Tm0.0736Ga2.67Al2.50O12 (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.

Paper Details

Date Published: 27 April 2016
PDF: 8 pages
Proc. SPIE 9893, Laser Sources and Applications III, 98930H (27 April 2016); doi: 10.1117/12.2227641
Show Author Affiliations
Jan Šulc, Czech Technical Univ. in Prague (Czech Republic)
Pavel Boháček, Institute of Physics of the ASCR, v.v.i. (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 ASCR, v.v.i. (Czech Republic)
Lubomír Havlák, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Karel Jurek, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Martin Nikl, Institute of Physics of the ASCR, v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 9893:
Laser Sources and Applications III
Jacob I. Mackenzie; Helena JelÍnková; Takunori Taira; Marwan Abdou Ahmed, Editor(s)

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