Abstract

In this method, a transmission grating is placed in front of the photographic plate. The hologram is formed in four exposures. After each exposure, the grating is translated by a quarter of its spatial period and the phase of the reference beam is shifted by 90°. An analysis shows that such a hologram is equivalent to one formed with an off-axis reference beam. Experimentally, holograms with carrier frequencies as high as 94 lines/mm gave good reconstructions. The new method should be advantageous when holograms are to be formed with sources of short coherence length or through phase distorting media.

© 1968 Optical Society of America

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