Dubinko V. I., Vainshtain D. I., Hartog H. W. // Nuclear Instruments and Methods in Physics Research. 2005. <...> Degradation mechanism of a laser media on the base of the KCl:Li-crystals L. I. Bryukvina Irkutsk Division of the Institute of Laser Physics, 130A Lermontova str., Irkutsk, 664033, Russia E-mail: baikal@ilph.irk.ru E. E. Penzina Irkutsk State University, 20 Gagarin Blvd., Irkutsk, 664003, Russia E-mail: penzina@api.isu.ru The degradation mechanism of a laser-active media on the base of the KCl:Li-crystals with FA(II) color centers during different stages of annealing has been studied. <...> It is demonstrated that the lithium colloids and quasi-metal potassium centers are appeared at first stages of annealing. <...> In the process of prolonged annealing, the mixed K—Li colloids are created and predominated n the crystals. <...> PACS: 61.72.jn Keywords: alkali-halide crystals, additive coloration, thermal annealing of crystals, lasers on color centers, thermal degradation of a laser media. <...> Исследован механизм деградации активной лазерной среды на основе кристалла KCl:Li с FА(II)-центрами окраски на разных стадиях процесса длительного хранения. <...>