Abstract

Double- and multiple-reference-beam nonlinear holography and their applications in the suppression of halolike background noise of the faithful images of diffuse objects are analyzed. The insights and conclusions are made through a study of the autocorrelation function of the hologram transmittance. An exact formulation is given for double-reference-beam holograms. For multiple-reference-beam holograms, however, only approximate closed forms are presented. It is shown that the addition of extra reference beams during the recording step of the hologram may greatly amplify the faithful images without increasing the background noise significantly. Furthermore, this amplification and the number of ways through which it could be affected increase with the number of additional references; however, more care should be taken in positioning the references so that there is not an overlap of any of the newly produced intermodulation products with the desirable images. Experiments confirm the theoretical expectations.

© 1980 Optical Society of America

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