Long-pulse 4.4&#x2013;4.6&#x00A0;&#x03BC;m laser oscillations of Fe2+ ions in a Zn1-xMnxSe (x = 0.3) crystal pumped by a 1940&#x00A0;nm Tm fiber laser through Cr2+ &#x2192; Fe2+ energy transfer

Maxim Doroshenko; Michal Jelínek; Adam Říha; Jan Šulc; Helena Jelínková; Václav Kubeček; Nazar O. Kovalenko; Andrey S. Gerasimenko

doi:10.1364/OL.44.005334

Optics Letters
Vol. 44,
Issue 21,
pp. 5334-5337
(2019)
•https://doi.org/10.1364/OL.44.005334

Long-pulse 4.4–4.6 μm laser oscillations of Fe²⁺ ions in a Zn_1-xMn_xSe (x = 0.3) crystal pumped by a 1940 nm Tm fiber laser through Cr²⁺ → Fe²⁺ energy transfer

Maxim Doroshenko, Michal Jelínek, Adam Říha, Jan Šulc, Helena Jelínková, Václav Kubeček, Nazar O. Kovalenko, and Andrey S. Gerasimenko

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Maxim Doroshenko, Michal Jelínek, Adam Říha, Jan Šulc, Helena Jelínková, Václav Kubeček, Nazar O. Kovalenko, and Andrey S. Gerasimenko, "Long-pulse 4.4–4.6 μm laser oscillations of Fe²⁺ ions in a Zn_1-xMn_xSe (x = 0.3) crystal pumped by a 1940 nm Tm fiber laser through Cr²⁺ → Fe²⁺ energy transfer," Opt. Lett. 44, 5334-5337 (2019)

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Abstract

Millisecond-pulse laser operation of ${Fe}^{2 +}$ ions at 78 K is demonstrated in the ${Zn}_{1 - x} {Mn}_{x} Se : {Fe}^{2 +}, {Cr}^{2 +}$ ( $x = 0.3$ ) crystal under a Tm fiber 1940 nm laser pumping through a ${Cr}^{2 +} \to {Fe}^{2 +}$ energy transfer process for the first time, to the best of our knowledge. The laser slope efficiency was 1% with respect to absorbed pumping energy at 1940 nm. The laser central wavelength shift from 4450 nm at 78 K up to 4510 nm at 110 K was observed. Tunability from 4350 up to 4670 nm at 78 K was achieved using an intracavity tuning element.

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