Photoinduced light scattering in LiTaO3:Nd crystal

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Abstract
Photoinduced light scattering of LiTaO3:Nd crystal (0.1 wt %) was examined by using a focused He‐Ne laser beam. When an ordinary incident beam illuminates the sample along the y axis, the scattered light is asymmetrical in the xy plane, and the scattered intensities display a time‐dependent distribution with a gradual increase and decrease for the ordinary and extraordinary beams, respectively. The situation is reversed for an extraordinary incident beam. When an incident beam with ordinary or extraordinary polarizations illuminates the sample along the x axis, two scattered specklons are dependent upon the crossing angle with almost the same intensity. We attribute them to a new photorefractive effect due to the microstructure change in LiTaO3 crystal with Nd doping. In addition, Raman spectra concerning the observed scattered structures are also measured and elucidated.