Quantitative control of partial coherence by ultrasonic waves is considered
theoretically and experimentally. The double coherence modulation factor
obtained is space-invariant or not according to whether a light beam passes
twice the same path or a different path in a progressive ultrasonic field by
reflection at a plane mirror or at a right-angle prism. A double-modulation
scheme using a plane mirror reflection system is found to be more effective than
a single-modulation scheme for coherence control of low levels of ultrasonic
power. The coherence of light is quantitatively varied with the input voltage
applied to the ultrasonic transducer.
© 1980 Optical Society of America
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