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We report spectroscopic characteristics and laser properties of the mid-infrared active laser medium Cr 2+ :CdS. Temperature-dependent absorption, luminescence and lifetime measurements of the 5 E exited state allow determination of peak emission cross section value of 1.35 × 10 −18 cm 2 in σ -polarization at room temperature. Lifetime values vary from 7.6 µs at 8 K to 0.48 µs at 320 K, corresponding to 22 % quantum yield at 285 K. Under Tm-fiber laser pumping, the continuous-wave output reached 1.8 W at 2.5 μm with 35.5 % slope efficiency. With a single CaF 2 prism, the CW Cr 2+ :CdS laser could be tuned from 2.240 to 3.285 µm.
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Sorokin et al. (2014) studied this question.
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