On generation of picosecond inhomogeneous shear strain fronts by laser-induced gratings
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Mode conversion of the LA wave obliquely incident on the interface. Sinusoids qualitatively illustrate the modulation of the amplitude in the inhomogeneous pure compression/dilatation (LA) and pure shear (TA) acoustic eigenmodes. The arrows indicate the dominant direction of the particle displacement in the high frequency limit. In general the displacement vector in both modes is inclined relative to the interface. The insets provide qualitatively the profiles of the LA and TA high frequency strain pulses.
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