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Efflcient room-temperature lasing is obtained in a Fe ^: ZnSe crystal pumped by 2.9364-цт giant pulses from an Er: YAG laser. The slope efficiency of a Fe ^ : ZnSe laser with respect to the absorbed pump energy is 13 %. The laser with a dispersion resonator can be continuously tuned from 3.95 to 5.05 цт. The luminescence lifetime of the T2 level of the Fe ^ ion in a ZnSe matrix at room temperature is measured to be 355 ± 15 ns.

The lasing characteristics of a Fe : ZnSe single crystal grown from the vapour phase by the free-growth technique using the chemical transport in hydrogen are studied. A Fe ^ : ZnSe laser cooled to liquid nitrogen temperature and pumped by 2.9364-цт radiation from an Er : YAG laser produces the 130-mJ output energy with a slope efflciency of 40 % in terms of the absorbed energy, which corresponds to a quantum efflciency of 55 %. The lasing spectrum in a dispersive resonator can be continuously tuned between 3.77 and 4.40 цт.technique have low internal losses [3, 4]. In our previous work [5], the first laser on a ZnSe : Fe crystal grown from a vapour phase was built and preliminary studies of its characteristics were performed. As a result, a slope laser efficiency of 18 % was obtained at an output energy of 25 mJ. However, the resonator used in Ref.[5] had rather high parasitic losses caused by the low optical quality of the ZnSe : Fe crystal and the Fresnel reflection from the windows of the cryostat in which the crystal was placed.The aim of this work was to study the lasing characte ristics of a ZnSe : Fe crystal placed in a laser resonator with minimum parasitic losses.

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