POLARIZATION INFLUENCES ON THE EFFICIENCY OF NOISE GRATINGS RECORDED IN SILVER-HALIDE HOLOGRAMS

The efficiency of noise gratings recorded with single-beam exposures in bleached silver halide emulsions is analyzed as a function of the polarization state of the readout wave. Experimental results are presented and discussed on the basis of a theoretical model that considers both a linear and a nonlinear relation between the refractive-index modulation and the exposure. The dependence of the noise gratings' efficiency on the relative polarization between the construction and reconstruction beams is analyzed, and we find that this is represented by a quadratic curve of cos2 delta, where delta is the polarization angle. The quantitative analysis is carried out with this model based on the coupled-wave theory, and the calculated results obtained by use of the theoretical model agree well with the experimental ones.