Abstract: A preset grating technique is put forward for slow response characteristics of the photorefractive crystal. This technique can be achieved by the preset laser independent of the signal beam. The characteristics of MPPC based on preset grating and its physical mechanism are studied experimentally. It is indicated that the response time of photorefractive MPPC based on preset grating can be reduced greatly, and hence this technique is of great practical value for the application of MPPC with a lowly repeated narrow pulse beam.

Key words: photorefraction, preset grating, MPPC