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Ultrafast laser-induced strain waves in thin rutheniumlayers
We report on the time-dependent optical diffraction from ultra-high frequency laser-induced acoustic waves in thin layers of ruthenium deposited on glass substrates. We show that the thermo-optic and strain-optic effects dominate the optical response of Ru layers to a traveling longitudinal strain wave. In addition, we show the generation and detection of acoustic waves with a central frequency ranging from 130 GHz to 750 GHz on ultra-thin layers with thicknesses in the range of 1.2 - 20 nm.doi:10.1364/oe.438286 pmid:34615284 fatcat:7ob7idqugbc23eqmy2hyjwabyq