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Characteristics of the laser on a polycrystalline ZnSe : Fe2+ sample pumped by the radiation of a non-chain electro-discharge HF laser at room temperature are investigated. The radiation spot of the HF laser on a surface of an active element had an elliptical shape with the axes a × b = 2.8 × 3.2 ÷ 8.25 × 9.5 mm. A maximal generation energy E = 192 mJ was obtained at the efficiency with respect to the energy absorbed in the sample ηabs = 23% at the dimensions of the pumping spot a × b = 6.8 × 7.5 mm. In this case, a maximal slope efficiency with respect to the absorbed energy was ηsl = 29%. At the spot dimensions a × b = 2.8 × 3.2 mm the slope efficiency was ηsl = 34%. Possibilities of a further increase of the generation energy of a ZnSe : Fe2+ laser pumped by radiation of the HF laser at room temperature are discussed.

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