Analysis of nonuniform transmission gratings recorded in photopolymerizable silica glass materials

This is the authors' abstract. We don't add key points for this paper.

We theoretically and experimentally analyze the angular selectivity curves of nonuniform gratings recorded in a photopolymerizable silica glass. Due to the rigidity of this material, shrinkage would not cause fringe bending, so we propose that the coupling of the beams at the recording stage (two-wave mixing) produces the resulting nonuniformities. Nonuniform transmission holographic gratings can be analyzed in rigid media using the coupled-wave theory but introducing the results obtained from the two-wave mixing treatment and taking into account the absorption and the nonlinear effects produced by the mechanism of photopolymerization and diffusion. Good agreement between theory and experience is obtained.