摘要
Diffraction from the second-order photorefractive grating written in KTa_(1-x)Nb_(x)O_(3)(x=0.32)crystal with cubic phase has been observed for the first time.The behaviors of this diffraction have been investigated experimentally.Some qualitative explanations have been proposed.
基金
Supported by the National Nat ural Science Foundation of China,and by the State Sciences and Technology Commission of China under Grant No.2 for key research project.
