Abstract
In this paper, we systematically study the generation and propagation of coherent acoustic pulses in a metal–dielectric system using a two-color femtosecond pump–probe technique at different probe angles. A long-lived acoustic oscillation is observed in a borosilicate glass coated with gold and shows different attenuations and amplitude at different probe wavelengths. Our study demonstrates that the two-color optical pump–probe technique can be used as a noninvasive tool to study acoustic properties of dielectric materials.
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