Abstract

How to visualize a strain wave front of a progressive acoustic wave by means of conventional Fresnel imaging is shown. The theory suggests that for a Raman-Nath parameter of 0.1 ≤ υ ≤ 1, the stroboscopic illumination automatically produces the strain wave front image in a limited detection zone, because the spatial harmonic images of the original sinusoidal field coming from the interference among the higher-order diffracted light, are appropriately superimposed. The experiment showed good coincidence with theory and its usefulness in observing surface acoustic waves.

© 1985 Optical Society of America

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