Theoretical study on coupling effects of modulation depth between two photorefractive phase gratings with an external applied field

摘要

We used the perturbation expanding method to the hopping model and studied coupling effects of the modulation depth between two photorefractive phase gratings stored in one point with an external applied DC electric field. It has been found that the modulation depth of one of the two gratings seriously affects the spatial - charge field of the other grating.