A new method of measuring the scattered light to determine the noise spectral power density is described. The technique is shown to be useful at the high spatial frequencies used in holography, beyond the range of the former methods of noise power measurement. Measurements of the grain noise of several photographic emulsions used for holography are presented; they are consistent with a model of emulsions characterized by a transmission correlation length. The measured correlation length of several of the emulsions fit experimentally observed spatial frequency responses. Data on noise power of several other photosensitive materials suitable for holography are also presented.
© 1970 Optical Society of America
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