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Conferences > PEMD > 2003 > MCI > 144

Absorption saturation and thermo-lensing effects as the sources of nonlinear anisotropic change of refractive index in Cr4+:YAG at CW excitation

Alexander V. Kir’yanov and Yuri O. Barmenkov

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Abstract

An experimental investigation and theoretical modeling of nonlinear refraction in a CW-pumped Cr4+:YAG crystal at wavelength 1.06µm is reported. An analysis of the processes resulting in nonlinear change of refractive index of Cr4+:YAG allows to conclude that the main contributions in the change are the effect of Cr4+ centers’ population perturbation due to the ground-state absorption saturation and the thermo-lensing effect. The role of the refractive index change anisotropy stemming from both the effects is addressed for the first time to our knowledge.

© 2003 Optical Society of America

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