Abstract
An acousto-optical study of the effect of a lead film on propagation of high-power surface acoustic waves (SAW) along the Z direction on the Y cut of LiNbO3 is reported. The presence of the metal film has been found to stimulate spatial oscillations of SAW components and suppress the onset of nonlinearity. If the film is more narrow than the SAW aperture, one observes considerable inflow of acoustic energy from the free surface to the film region. A study of the film-induced sound-velocity dispersion revealed it to have a linear pattern. An analysis of the results within the present theoretical models of soliton development showed that a soliton-like monopulse can form only if a very thin (∼150 A) lead film is present.
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