Beam distortion detection and deflectometry measurements of gigahertz surface acoustic waves

Higuet, Julien; Valier-Brasier, Tony; Dehoux, Thomas; Audoin, Bertrand
November 2011
Review of Scientific Instruments;Nov2011, Vol. 82 Issue 11, p114905
Academic Journal
Gigahertz acoustic waves propagating on the surface of a metal halfspace are detected using different all-optical detection schemes, namely, deflectometry and beam distortion detection techniques. Both techniques are implemented by slightly modifying a conventional reflectometric setup. They are then based on the measurement of the reflectivity change but unlike reflectometric measurements, they give access to the sample surface displacement. A semi-analytical model, taking into account optical, thermal, and mechanical processes responsible for acoustic waves generation, allows analyzing the physical content of the detected waveforms.


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