Abstract
A quantitative comparison of experiment to the theoretical descriptions of two mechanisms for the optical generation of tunable ultrasonic waves is presented. Crossed picosecond excitation pulses drive the acoustic response either by stimulated Brillouin scattering or absorptive heating. Bragg diffraction from the induced acoustic grating permits detection of the ultrasonic disturbance and measurement of weak absorptions, optoelastic constants and acoustic attenuation. The methods are applied to various liquids Measurement of the CH stretch fifth overtone absorption spectrum of pure benzene in a short path length cell is demonstrated.
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