CC BY
20LS-O-5
2.3 ^m and 4.4 ^m lasing in Cr,Fe:Zn1-xMnxSe (x=0.3) single crystal pumped by Q-switched Er:YLF laser at 1.73 ^m
A. Riha1, M.E. Doroshenko2, H. Jelinkova1, M. Nëmec1, M. Jelinek1, M. Cech1, D. Vyhlidal1, N.O. Kovalenko3, A.S. Gerasiemenko3
1Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Bfehovâ 7, 115 19 Prague, Czech Republic
2Laser Materials and Technology Research Center, General Physics Institute, Vavilov Str. 38, 119991 Moscow, Russian Federation
3Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Lenin Ave., Kharkiv, Ukraine
Novel Cr2+ and Fe2+ co-doped Zm-xMnxSe (x = 0.3) crystal with Cr2+ to Fe2+ ions concentration ratio about 1:2 (both doping ions concentration were at the ~1018 cm-3 level) with good optical quality was synthesized. Under pumping by a Q-switched Er:YLF laser at 1.73 p,m the oscillations of Cr2+ ions at 2.3 p,m as well as Fe2+ ions at 4.4 p,m were realized. Both regimes, i. e. intracavity pumping of Fe2+ ions by Cr2+ as well as excitation through Cr2+ -> Fe2+ ions energy transfer mechanism were demonstrated. The output energy for Cr2+ ions lasing at 2.3 p,m was up to 900 ^J while Fe2+ ions lasing at 4.4 p,m reached up to 60 in the intracavity pumping mode. In the Cr2+ -> Fe2+ energy transfer mode, the maximum output energy was 20 ^J at 4.4 p,m. Laser generation at 2.3 ^m was observed up to 340 K while Fe2+ ions oscillations stopped for temperatures above ~150 K. Fe2+ ions oscillation wavelength was observed to shift with temperature increase from ~4.4 p,m at 78 K to ~4.5 p,m at 150 K. The Fe2+ ions output pulses were quite stable in amplitude and temporal domain in both excitation modes with beam profile close to fundamental transversal mode.
