NONELECTROOPTIC NONLOCAL PHOTOREFRACTIVE EFFECT IN A POLYMER COMPOSITE

The grating spacing dependence of photorefractive diffraction efficien cy in an organic polymer composite is presented and discussed. The ana lysis of the grating spacing dependence of the refractive index modula tion with the standard model of photorefractive grating dynamics is sh own to lead to inconsistencies in determination of the maximum attaina ble index change. It is shown that the effects resulting from orientin g of the composite's optically second-order nonlinear chromophores in the periodic local field affect the formation of the refractive index grating. (C) 1995 American Institute of Physics.