An analysis is made of an infrared chopper based on the refraction of light rays by a low frequency (~1-MHz) standing acoustic wave in a block of material such as germanium. Computer programs are described for tracing the rays through the acoustic field and for calculating the contrast ratio at a small aperture detector following the chopper. Experimental results obtained with a germanium device are in good agreement with the theory.
© 1981 Optical Society of America
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