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The authors propose a two-step method which enables them to obtain transmission holographic optical elements of high diffraction efficiency as well as a good signal-to-noise relation. By means of a device using partially coherent light, a master holographic optical element can be copied in a second photosensitive material. The results which are obtained in dichromated gelatin and photoresist are comparable to those which are obtained directly.
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Pascual et al. (1991) studied this question.
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