Abstract
Received 12 November 2009; revised manuscript received 23 March 2010; published 13 April 2010We study one-dimensional nonlinear propagation of high-amplitude acoustic waves in sapphire, for varioussample temperatures, sample thicknesses, and pump fluences. Strain waves are generated in a 100-nm-thickchromium film and launched into the sapphire. For temperatures 60 K, damping can be neglected andpropagation is dominated by the nonlinear and dispersive properties of the sapphire substrate. An interfero-metric technique is used to detect the wave on an epitaxially grown 20-nm-thick Cr film at the opposite sideof the sample. At the lowest temperature of 18 K, a train of up to seven solitons is detected in sapphire for apump fluence of 11 mJ/cm
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