Abstract

A model is developed for numerically calculating the nonlinear change of the refractive index in a Cr4+:YAG crystal under the powerful resonant (wavelength 1.06 μm) continuous-wave excitation. The anisotropy features of the Cr4+ centers’ population perturbation (bleaching) and the sample inhomogeneous heating (leading to the thermolensing effect) as the basic contributions in the refractive-index nonlinear change are addressed for the first time to our knowledge.

© 2003 Optical Society of America

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