Abstract
The phase shift of the photorefractive grating against the interference intensity pattern in the two-wave mixing with Bi12SiO20 crystal has been measured as a function of the total intensity of the reference and signal beam when the intensity ratio was always constant. The phase shift departures from 90° as the total intensity increases. According to the change of the phase shift, two-wave mixing gain decrease as a function of the total incident intensity.
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