Abstract

While employing the knife-edge (KE) technique for detecting surface acoustic waves (SAW) in an experimental apparatus, it was observed that the phase of the detected signals varied with the lateral position of the KE. This phenomenon is explained by deriving the Fresnel diffraction pattern of a Gaussian beam reflected from a surface sustaining continuous SAW and applying the results to obtain an analytical expression for the signal detected by the KE technique in the near-field. The dependence of the detected acoustic signal on the lateral position of the KE, which is described by this expression, is verified experimentally. The frequency response of the KE technique and the effect of nonsinusoidal SAW are also considered.

© 1985 Optical Society of America

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