Abstract
Optical nonlinearities of periodically poled crystals were investigated by the single beam Z-scan technique with a continuous wave (cw) laser beam at . The nonlinear optical absorption coefficient and refractive index change are determined to be and at light intensity, respectively. Both sign and magnitude of the measured refractive nonlinearity are considerably different from the Z-scan results in congruent . The nonlinearities in the periodically poled induced by continuous waves are believed to be mainly due to the photorefractive effect.
© 2007 Optical Society of America
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