An experiment has been performed to find evidence and analyze a nonlinear diverging lensing effect occurring in a flash-lamp-pumped Cr3+:LiSAF laser. The effect is assigned to a refractive-index change of the material that is proportional to the Cr3+-excited ion population, the corresponding constant of proportionality being determined from the time variation of the laser-pulse far-field divergence.
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Passilly et al. (2004) studied this question.
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