This paper presents a method of producing highly efficient reflection holographic portraits. The procedure has two stages, facilitating a maximum optimization of the entire process with respect both to the diffraction efficiency of the final product and to safety when the human eye is exposed to a pulsed laser beam. The procedure makes it possible to produce any number of reflection copies, with increased diffraction efficiency, from a single original.
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Růžek et al. (1979) studied this question.
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