Scanned irradiation of a Si (111) crystal with a focused cw mode-locked argon or neodymium:yttrium aluminum garnet laser to its melting threshold has generated a type of surface morphology, ripples, with a periodicity which is dependent on the laser pulse width. We interpret these ripples as being a thermoelastically generated surface acoustic wave frozen out on the crystal surface.
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Jost et al. (1986) studied this question.
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