Measurement of laser-induced refractive index change of inverted ferroelectric domain LiNbO3.
Optical nonlinearities of periodically poled LiNbO(3) 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 x 10(-6) cm/W and 2.6 x 10(-4) at 0.5 MW/cm(2) light intensity, respectively. Both sign and magnitude of the measured refractive nonlinearity are considerably different from the Z-scan results in congruent LiNbO(3). The nonlinearities in the periodically poled LiNbO(3) induced by 532 nm continuous waves are believed to be mainly due to the photorefractive effect.
Chen
Yunlin
Y
Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA. ylchen@uark.edu
Liu
S W
SW
Wang
Dongdong
D
Chen
Tianlin
T
Xiao
Min
M