Abstract
Photorefractive gain in Bi12SiO20 (BSO) crystal was studied using a two-wave mixing configuration. It was clear that the gain was strongly dependent on the incident plane in the BSO crystal rotated clockwise around the <11̄0> direction where the rotation angle of zero coincided with the <001> direction. There were two regions in the gain, i.e., the gain was negative in the range of 10°∼170° and positive in the range of 190°∼350°. The energy exchange between two coherent beams could be explained by the diffraction efficiency of the diffracted beam being a function of the rotation angle of the crystal. The experimental results agreed well with the theoretical results.
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