A transient grating technique is used to detect picosecond acoustic pulses in supported metal films. Crossed femtosecond laser pulses generate acoustic responses with longitudinal components propagating normal to the film plane and surface acoustic wave components propagating in the film plane. Surface “ripple” associated with both components is detected through the diffraction of a probe beam. The measurements yield enhanced information content for characterization of film thickness and mechanical properties.
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Crimmins et al. (1999) studied this question.
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