Abstract

The effects of aggregate color centers on the operation conditions of LiF( F 2 → F + 2) lasers which use a two-step photoionization technique have been studied. High F + 3 centers concentration compared with those of F 2 centers and low concentration of F 3, N are necessary for long-time stable room-temperature operation of the laser. The possible mechanisms of photoconversion processes which take place in nonoptimized (Type I) and optimized (Type II) LiF crystals for long-time stable room-temperature F 2 + lasting have been proposed.

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