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Proceedings Paper

Laser-diode pumped dysprosium-doped lead thiogallate laser output wavelength temporal evolution and tuning possibilities at 4.3-4.7 um
Author(s): Helena Jelínková; Maxim E. Doroshenko; Jan Šulc; Michal Němec; Michal Jelínek; Vjatcheslav V. Osiko; Valerii V. Badikov; Dmitri V. Badikov
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Paper Abstract

On the basis of our previous Dy3+:PbGa2S4 laser study, laser output wavelength temporal evolution as well as tuning possibilities in the range 4.3–4.7 μm were investigated. Active crystal was pumped by a fiber-coupled Brightlase Ultra- 50 diode laser (1.7 μm, max. power 7.5 W). Laser resonator was formed by flat dichroic pumping mirror (T = 70%@1.7 μm, R~100% @ 3.5 - 5 μm) and a concave (r = 200 mm) output coupler with R~99% @ 3.5 – 5 μm. The laser output wavelength dependence on the pump pulse duration and its evolution during the pulse was investigated first without any spectrally-selective element in the cavity. At pump pulse duration of 1 ms, generation just near Dy3+ fluorescence maximum of 4.35 μm has been observed. Prolongation of the pulse up to 5 ms led to similar lasing at 4.35 μm in the first millisecond, followed by simultaneous generation at 4.35 and 4.38 μm in the next millisecond, and further lasing at 4.6 μm till the end of the pump pulse. Increase of pump pulse duration up to 10 ms led to similar oscillation pulse development followed by generation at 4.6 μm only. Furthermore, output wavelength tuning using MgF2 birefringent filter as a cavity spectral selective element was investigated under 10 ms pumping. Almost continuous tuning without any significant dip has been observed within spectral range from 4.3 up to 4.7 μm. Due to practically closed cavity mean output power in the maximum of tuning curve was in the order of 400 μW.

Paper Details

Date Published: 16 March 2016
PDF: 6 pages
Proc. SPIE 9726, Solid State Lasers XXV: Technology and Devices, 97261A (16 March 2016); doi: 10.1117/12.2212897
Show Author Affiliations
Helena Jelínková, Czech Technical Univ. in Prague (Czech Republic)
Maxim E. Doroshenko, A. M. Prokhorov General Physics Institute (Russian Federation)
Jan Šulc, Czech Technical Univ. in Prague (Czech Republic)
Michal Němec, Czech Technical Univ. in Prague (Czech Republic)
Michal Jelínek, Czech Technical Univ. in Prague (Czech Republic)
Vjatcheslav V. Osiko, A. M. Prokhorov General Physics Institute (Russian Federation)
Valerii V. Badikov, Kuban State Technological Univ. (Russian Federation)
Dmitri V. Badikov, Kuban State Technological Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 9726:
Solid State Lasers XXV: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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