Abstract

This Letter determines the ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ ions energy transfer process parameters in the ${\mathrm{Zn}}_{1-x}{\mathrm{Mn}}_x\mathrm{Se}\text{:}{\mathrm{Cr}}^{2+},{\mathrm{Fe}}^{2+}$ ($x=0.3$) crystal and demonstrates a dipole-dipole type of the ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ ions nonradiative energy transfer. The intracavity ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ pumping as well as pumping through ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ energy transfer in the ${\mathrm{Zn}}_{1-x}{\mathrm{Mn}}_x\mathrm{Se}\text{:}{\mathrm{Cr}}^{2+}$, ${\mathrm{Fe}}^{2+}$ ($x=0.3$) crystal under 1735 nm excitation by an YLF:Er laser was realized in a temperature range of 78 up to 150 K for the first time, to the best of our knowledge. Output pulse energy up to 20 μJ at $\sim 4400\mathrm{nm}$ under 5.5 mJ of 1735 nm absorbed pump energy was obtained for the ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ ions energy transfer mode.

© 2019 Optical Society of America

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