In additively colored KCl : Li crystals, the (F+2)A color center laser operates through a photodynamic equilibrium in which UV excitation generates a partial conversion of (F2)A centers to (F+2)A. Evidence is presented which shows that continuous UV exposure is necessary to sustain laser action because of the neutralization of (F+2)A centers which occurs through the capture of F′A center electrons. The bleaching of FA centers results directly from absorption of the 1.3-μm pump radiation. Since the absorption is extremely weak, only modest UV intensities are needed for intense cw laser operation.
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Schneider et al. (1983) studied this question.
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