Low temperature gain-switched operation of non-cubic Cr2+, Fe2+:Zn1-xMgxSe (x ≈ 0.2 and x ≈ 0.3) single crystals in mid-infrared under different excitation wavelengths

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

doi:10.1117/12.2575879

5 March 2021 Low temperature gain-switched operation of non-cubic Cr²⁺, Fe²⁺:Zn_1-xMg_xSe (x ≈ 0.2 and x ≈ 0.3) single crystals in mid-infrared under different excitation wavelengths

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

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Proceedings Volume 11664, Solid State Lasers XXX: Technology and Devices; 1166410 (2021) https://doi.org/10.1117/12.2575879
Event: SPIE LASE, 2021, Online Only

Conference Poster

Abstract

Two novel cryogenically cooled non-cubic wurtzite structure Cr²⁺,Fe²⁺:Zn_1-xMg_xSe (x ≈ 0.2 and x ≈ 0.3) single crystals co-doped with Cr²⁺ and Fe²⁺ ions with thickness of 2.5 and 5 mm, respectively, were investigated under two excitation wavelengths of the Q-switched Er³⁺:YLF (λ ≈ 1.73 μm) and Er³⁺:YAG (λ ≈ 2.94 μm) lasers. Absorption and fluorescence spectra, fluorescence lifetimes as well as laser output characteristics for both Cr²⁺ and Fe²⁺ doping ions were measured at 78 K. Both Cr²⁺,Fe²⁺:Zn_1-xMg_xSe laser systems were able to generate radiation from Cr²⁺ as well as Fe²⁺ active ions depending on appropriate pumping wavelength and a set of laser cavity mirrors. Moreover, Fe²⁺ ions mid-IR lasing using the Cr²⁺ → Fe²⁺ ions energy transfer at ~4.57 μm and ~4.8 μm for magnesium content of x ≈ 0.2 and x ≈ 0.3, respectively were realized for ~1.73 μm Q-switched Er³⁺:YLF laser pumping. The results present an opportunity to develop novel mid-IR 4.4 – 4.9 μm coherent laser sources based on non-cubic AIIBVI matrices using direct Fe²⁺ ions pumping at ~2.94 μm as well as excitation via co-doped Cr²⁺ ions at ~1.73 μm.

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Adam Říha, Helena Jelínková, Maxim E. Doroshenko, Jan Šulc, Michal Jelínek, Miroslav Čech, David Vyhlídal, and Nazar O. Kovalenko "Low temperature gain-switched operation of non-cubic Cr²⁺, Fe²⁺:Zn_1-xMg_xSe (x ≈ 0.2 and x ≈ 0.3) single crystals in mid-infrared under different excitation wavelengths", Proc. SPIE 11664, Solid State Lasers XXX: Technology and Devices, 1166410 (5 March 2021); https://doi.org/10.1117/12.2575879

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