The influence of Cr2+ to Fe2+ ions concentration ratio on the Cr,Fe:Zn1-xMnxSe (x≈0.15) laser properties excited via Cr2+ → Fe2+ energy transfer

Adam Říha; Helena Jelínková; Maxim E. Doroshenko; Michal Němec; Jan Šulc; David Vyhlídal; Nazar O. Kovalenko

doi:10.1117/12.2648406

8 March 2023 The influence of Cr²⁺ to Fe²⁺ ions concentration ratio on the Cr,Fe:Zn_1-xMn_xSe (x≈0.15) laser properties excited via Cr²⁺ → Fe²⁺ energy transfer

Adam Říha, Helena Jelínková, Maxim E. Doroshenko, Michal Němec, Jan Šulc, David Vyhlídal, Nazar O. Kovalenko

Author Affiliations +

Proceedings Volume 12399, Solid State Lasers XXXII: Technology and Devices; 123990Q (2023) https://doi.org/10.1117/12.2648406
Event: SPIE LASE, 2023, San Francisco, California, United States

Conference Poster

Abstract

In this work the results of research of an optimal concentration ratio of Cr²⁺ and Fe²⁺ co-doped active ions for more efficient Cr²⁺ → Fe²⁺ ions energy transfer in a chosen Zn_1-xMn_xSe (x ≈ 0.15) host material are presented. Three cryogenically cooled Cr²⁺,Fe²⁺:Zn_1-xMn_xSe (x ≈ 0.15) single crystals with the same thickness of ~2.7 mm and with different doping ratios of Cr²⁺ and Fe²⁺ ions of ~1:1, ~2:1, and ∼3:1 were investigated under Q-switched Er:YLF laser excitation (wavelength: ∼1.73 μm, pulse energy: ∼10 mJ, pulse duration: ∼150 ns). The temperature dependence of the absorption and fluorescence spectra, the fluorescence decay time as well as the laser output characteristics were measured. The Fe²⁺ ions maximum laser output of ~50 μJ at the wavelength range of ~4.25-4.42 μm was obtained with the crystal sample for which the active ions ratio was ~2:1. A further increase of the chromium ions amount (Cr²⁺:Fe²⁺ ≈ 3:1) led to worse results. Using appropriate resonator cavity mirrors, the samples were also able to generate the ~2.35-2.45 μm laser radiation from Cr²⁺ ions. The laser output beam spatial profiles were close to Gaussian in all cases. In summary, an optimized compact source of mid-infrared ~4.25-4.42 μm (Fe²⁺) and ~2.35-2.45 μm (Cr²⁺) of Cr,Fe:Zn_1-xMn_xSe (x ≈ 0.15) crystal pumped via Cr²⁺ ions by the ~1.73 μm radiation is described.

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Adam Říha, Helena Jelínková, Maxim E. Doroshenko, Michal Němec, Jan Šulc, David Vyhlídal, and Nazar O. Kovalenko "The influence of Cr²⁺ to Fe²⁺ ions concentration ratio on the Cr,Fe:Zn_1-xMn_xSe (x≈0.15) laser properties excited via Cr²⁺ → Fe²⁺ energy transfer", Proc. SPIE 12399, Solid State Lasers XXXII: Technology and Devices, 123990Q (8 March 2023); https://doi.org/10.1117/12.2648406

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