[Study on stimulated emission of Eu2+ in crystal KMgF3 : Eu2+].

The line emission peak of Eu2+ ion in crystal KMgF3 is at 360 nm. The probability of stimulated emission on 4f7 (6 P7/2 )-->4f7 (8 S7/2 ) transition was predicted with a four-level decay model of Eu2+ 6P7/2 excited states proposed by the authors. Optic gain and net gain coefficient (g=11. 4+/-3. 2)cm(-1) of 360 nm emission in crystal KMgF3 : Eu2+ were measured by ASE method, and the predication was proved by experiment. The net gain coefficient can be increased by annealing or doping crystal KMgF3 : Eu2+ with Gd3+ or Ce+.