Abstract
Light passing through ultrasonic waves of finite amplitude at the angle at which Bragg diffraction is dominant produces diffraction orders which contain images of the ultrasonic wavefront, with multiple images appearing in the higher orders. These multiple images are attributed to multiple scattering of light by the fundamental ultrasonic wave. The harmonics of the ultrasonic wave arising from nonlinearity of the propagating medium are isolated by use of a transmission filter plate. The images produced by them are larger than those produced by the fundamental.
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