Abstract
A complete characterization of unslanted holographic reflection gratings with high diffraction efficiency recorded on ultrafine grain emulsion BB640 has been achieved. By use of a wavelength-dependent absorption coefficient, the diffraction efficiency, the replay wavelength, and the spectral bandwidth of each recording has been obtained. Corresponding index modulation, absorption, and effective thickness have been obtained with high accuracy by fitting the experimental data with Kogelnik's theory.
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