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
Alexander V. Kir’yanov and Juan Carlos Bermudez G., "Anisotropy of refractive-index nonlinear change in Cr4+: YAG at cw resonant excitation: modeling," J. Opt. Soc. Am. B 20, 2454-2469 (2003)