The Bragg selectivity of a volume hologram is a crucial characterization metric, but distorted Bragg selectivity curves obtained from holograms in soft media cannot be evaluated by existing analysis techniques. We demonstrate that distorted Bragg curves arise from mechanical strain within the polymer network, causing non-uniform distortion of the grating fringe spacing. We then present a method for obtaining spatially resolved Bragg selectivity curves and for evaluating the local and global hologram fidelity.
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Sias et al. (2024) studied this question.
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