Gain-switched Fe:ZnMgSe laser oscillation under cryogenic temperature

H. Jelinková; M. E. Doroshenko; M. Němec; J. Šulc; M. Jelínek; D. Vyhlídal; V. Kubeček; Y. A. Zagoruiko; N. O. Kovalenko; A. S. Gerasimenko; V. M. Puzikov; V. K. Komar

doi:10.1117/12.2041286

28 February 2014 Gain-switched Fe:ZnMgSe laser oscillation under cryogenic temperature

H. Jelinková, M. E. Doroshenko, M. Němec, J. Šulc, M. Jelínek, D. Vyhlídal, V. Kubeček, Y. A. Zagoruiko, N. O. Kovalenko, A. S. Gerasimenko, V. M. Puzikov, V. K. Komar

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Proceedings Volume 8959, Solid State Lasers XXIII: Technology and Devices; 895926 (2014) https://doi.org/10.1117/12.2041286
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

The spectroscopic and laser properties of bulk Bridgman-grown Zn_1-xMg_xSe single crystals with the various concentrations of Mg (x=0.19; x=0.27; x=0.38) were investigated in the wide temperature range. The pumping was provided by a 2.94 μm Q-switched Er:YAG laser with a maximal energy of 15 mJ in 120 ns pulse, repetition rate 1 Hz. Q-switched operation was achieved by the Brewster angle cut LiNbO3 Pockels cell placed between the rear mirror and the Er:YAG laser active medium. The pump radiation was directed into the Fe:ZnMgSe crystal placed inside the LN cooled dewar. The 55 mm long plane-concave cavity was formed by a dichroic pumping mirror (T = 92 % @ 2.94 μm and R = 100 % @ 4 - 5 μm) and a output coupler (R = 95 % @ 4.5 μm, r = 200 mm). The strong dependence of output pulse energy on temperature was observed for all samples. The maximum output Fe,Cr:Zn1- xMgxSe laser energy was 230 μJ and 180 μJ (for Mg concentration x=0.19 and x=0.38, respectively) for gain switched operation at 88 K. The central emission wavelength of ~ 4600 nm, ~ 4700 nm and ~ 4800 nm for Mg concentration x=0.19; x=0.27, and x=0.37, respectively at 88 K was obtained. The emission wavelength was found to increase up to ~ 4700 nm and ~ 4900 nm at 250 K for Mg concentration x=0.19 and x=0.38, respectively. This results show the possibility to obtain sufficiently longer oscillation wavelengths compared to previously studied Fe:ZnSe active medium especially at liquid nitrogen temperatures when pumping by free-running Er:YAG laser becomes possible. Fluorescence spectra and lifetimes of Fe2+ ions in different Zn_1-xMg_xSe crystals in the range from 250 K down to 80 K were also measured.

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H. Jelinková, M. E. Doroshenko, M. Němec, J. Šulc, M. Jelínek, D. Vyhlídal, V. Kubeček, Y. A. Zagoruiko, N. O. Kovalenko, A. S. Gerasimenko, V. M. Puzikov, and V. K. Komar "Gain-switched Fe:ZnMgSe laser oscillation under cryogenic temperature", Proc. SPIE 8959, Solid State Lasers XXIII: Technology and Devices, 895926 (28 February 2014); https://doi.org/10.1117/12.2041286

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