Abstract

Optical nonlinearities of periodically poled LiNbO3 crystals were investigated by the single beam Z-scan technique with a continuous wave (cw) laser beam at 532  nm. The nonlinear optical absorption coefficient and refractive index change are determined to be 8.1×106cm/W and 2.6×104 at 0.5MW/cm2 light intensity, respectively. Both sign and magnitude of the measured refractive nonlinearity are considerably different from the Z-scan results in congruent LiNbO3. The nonlinearities in the periodically poled LiNbO3 induced by 532  nm continuous waves are believed to be mainly due to the photorefractive effect.

© 2007 Optical Society of America

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