Abstract
Abstract A theoretical model for non-uniform volume gratings is described in which the refractive index modulation and grating vector are allowed to vary with depth. The predictions of the model are compared with the measured angular response of reflection gratings recorded in dichromated gelatin and the variations of the grating parameters with depth are deduced. Gratings produced by different processing techniques are analysed and the effects of processing on grating non-uniformities are discussed.
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