2.3- and 4.4-μm Lasing in Cr, Fe:Zn1 –xMnxSe (x = 0.3) Single Crystal Pumped by Q-Switched Er:YLF Laser at 1.73 μm

Autor: Michal Jelínek, Adam Říha, Maxim E. Doroshenko, N. O. Kovalenko, Michal Němec, Igor S. Terzin, Helena Jelínková, Jan Šulc, David Vyhlídal
Rok vydání: 2020
Předmět:
Zdroj: Physics of Wave Phenomena. 28:231-235
ISSN: 1934-807X
1541-308X
Popis: Novel Cr2+ and Fe2+ co-doped Zn1–xMnxSe (x = 0.3) crystal with Cr2+ to Fe2+ ions concentration ratio of about 1 : 2 (both doping ions concentration were at the ~1018 cm–3 level) with a good optical quality was synthesized. Under pumping by a Q-switched Er:YLF laser at 1.73 μm, the oscillations of Cr2+ ions at 2.3 μm as well as Fe2+ ions at 4.4 μm were realized. Both regimes, i.e. intracavity pumping of Fe2+ ions by Cr2+ ions as well as excitation through the Cr2+ → Fe2+ ions energy transfer mechanism, were demonstrated. The output energy for Cr2+ ions lasing at 2.3 μm was up to 900 μJ while Fe2+ ions lasing at 4.4 μm reached up to 60 μJ in the intracavity pumping mode. In the Cr2+ → Fe2+ energy transfer mode, the maximum output energy was 20 μJ at 4.4 μm. Laser generation at 2.3 μm was observed up to 340 K while Fe2+ ions oscillations stopped for temperatures above ~150 K. The Fe2+ ions oscillation wavelength was observed to shift with temperature increase from ~4.4 μm at 78 K to ~4.5 μm 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 the fundamental transversal mode.
Databáze: OpenAIRE
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