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The operation at room temperature of a single-crystal Fe:CdTe laser excited by a nonchain electric-discharge DF laser was studied. The output energy of 29 mJ was obtained with a slope efficiency in terms of absorbed energy of 30%. The development of transverse parasitic oscillation at large pump spot sizes on the crystal surface limited the laser output energy. The laser with a nonselective cavity operated in the range of 5.3–5.9 μm; the total width of the generation spectrum was about 600 nm. Comparison of the Fe:CdTe generation spectra, obtained by pumping the crystal with DF and Fe:ZnSe lasers, confirmed the shift of the generation spectrum to the long wavelength region with increasing pump wavelengths. The maximum generation wavelength of the Fe:CdTe laser with a nonselective resonator excited by the Fe:ZnSe laser was 6.02 μm with a total width of the generation spectrum of about 370 nm. Ways are discussed for further increasing the room-temperature output energy of a Fe:CdTe laser.

Cr2+:ZnSe polycrystalline active elements were fabricated, with different distribution profiles of Cr ions concentration over their thicknesses and an equal absorption at a pump wavelength of 1.9 µm. The lasing characteristics of the obtained samples in short cavity schemes were determined, using a CW Tm3+-doped fiber laser and a Tm3+:YLF pulsed laser as the sources of pumping. There was found to be a correlation between the generation slope efficiency and the shape of the concentration profile. It was determined that bilateral doping samples achieved better laser performance. The maximum values of the slope efficiencies with respect to the absorbed power were η  =73% in the pulse-periodic mode, and η  =  37% in the continuous-wave mode.

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