Increasing the radiation energy of ZnSe : Fe2+ laser at room temperature

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 x b = 2.8 x 3.2 divided by 8.25 x 9.5 mm. A maximal generation energy E = 192 mJ was obtained at the efficiency with respect to the energy absorbed in the sample eta(abs) = 23% at the dimensions of the pumping spot a x b = 6.8 x 7.5 mm. In this case, a maximal slope efficiency with respect to the absorbed energy was eta(sl) = 29%. At the spot dimensions a x b = 2.8 x 3.2 mm the slope efficiency was eta(sl) = 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.