Characteristics of a polycrystalline ZnSe:Fe~(2+) laser at room temperature

摘要

Generation characteristics of laser on polycrystalline ZnSe:Fe~(2+) samples doped by the diffusion method have been investigated at room temperature under the pumping by an electrodischarge HF laser. With the sample doped from two sides (working surfaces) the obtained generation energy was E=253 mJ with the slope efficiency η_(sl)=33% and efficiency with respect to the absorbed energy η_(abs)≈28% at the elliptical shape of the pumping spot of dimension a×b=6.8×7.5 mm. It was established that possibilities of further increase of generation energy on samples of this type by increasing the pumping spot area (at a constant density of the pumping energy) are limited by developing parasitic generation that is inherent in lasers with disk geometry. First investigation results are presented for a laser on the polycrystalline sample produced by the technology capable of providing zero doping component concentration on the surface and a maximal concentration at the centre of the sample (sample with "internal doping"). Prospects are discussed for increasing the generation energy of ZnSe:Fe~(2+) laser at room temperature by developing multilayer samples on the bases of the doping technique mentioned.