Abstract

Recording materials producing higher efficiency, low absorption holograms are usually photosensitive only to blue and uv light. If a hologram is formed at a blue wavelength in such a material and is illuminated at a red wavelength, generally the reconstructed wavefront is aberrated, and the resolution of the image is reduced. A method of hologram formation is described that can alleviate this problem. In this method, a hologram H1 is formed first at the red wavelength λ1 in a photographic emulsion. This hologram is then illuminated at the blue wavelength λ2. The diffracted wave from H1 is used as the subject wave for forming the desired high efficiency hologram H2. If certain requirements are met, illumination of H2 at λ1 can produce an aberration-free reconstruction of the original subject wave. Experimental results of forming H2 of a point source on dichromated gelatin film are presented. The hologram was formed at λ2 = 4800 Å but could reconstruct an aberration-free wavefront at λ1 = 6328 Å. The hologram had about 80% diffraction efficiency and essentially no absorption loss.

© 1971 Optical Society of America

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