Abstract

Optical nonlinearities of periodically poled ${\text{LiNbO}}_{\text{3}}$ crystals were investigated by the single beam Z-scan technique with a continuous wave (cw) laser beam at $532\text{\hspace{0.17em} nm}$. The nonlinear optical absorption coefficient and refractive index change are determined to be $8.1\times {10}^{-6}\text{cm}/\text{W}$ and $2.6\times {10}^{-4}$ at $0.5\text{MW}/{\text{cm}}^{\text{2}}$ light intensity, respectively. Both sign and magnitude of the measured refractive nonlinearity are considerably different from the Z-scan results in congruent ${\text{LiNbO}}_{\text{3}}$. The nonlinearities in the periodically poled ${\text{LiNbO}}_{\text{3}}$ induced by $532\text{\hspace{0.17em} nm}$ continuous waves are believed to be mainly due to the photorefractive effect.

© 2007 Optical Society of America

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