Abstract
Two novel cryogenically cooled non-cubic wurtzite structure Cr<sup>2+</sup>,Fe<sup>2+</sup>:Zn<sub>1-x</sub>Mg<sub>x</sub>Se (x ≈ 0.2 and x ≈ 0.3) single crystals co-doped with Cr<sup>2+</sup> and Fe<sup>2+</sup> ions with thickness of 2.5 and 5 mm, respectively, were investigated under two excitation wavelengths of the Q-switched Er<sup>3+</sup>:YLF (λ ≈ 1.73 μm) and Er<sup>3+</sup>:YAG (λ ≈ 2.94 μm) lasers. Absorption and fluorescence spectra, fluorescence lifetimes as well as laser output characteristics for both Cr<sup>2+</sup> and Fe<sup>2+</sup> doping ions were measured at 78 K. Both Cr<sup>2+</sup>,Fe<sup>2+</sup>:Zn<sub>1-x</sub>Mg<sub>x</sub>Se laser systems were able to generate radiation from Cr<sup>2+</sup> as well as Fe<sup>2+</sup> active ions depending on appropriate pumping wavelength and a set of laser cavity mirrors. Moreover, Fe<sup>2+</sup> ions mid-IR lasing using the Cr<sup>2+</sup> → Fe<sup>2+</sup> 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 Er<sup>3+</sup>: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 Fe<sup>2+</sup> ions pumping at ~2.94 μm as well as excitation via co-doped Cr<sup>2+</sup> ions at ~1.73 μm.
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