Abstract
A laser pulse incident on a material may generate acoustic waves by means of two different phenomena: by thermal expansion at low incident power density (thermoelastic effect); and by vaporizing surface material at high incident power density (ablation effect). A synthesis of various theoretical models representing the acoustic displacements generated by a point laser impact is given, and then validated by interferometer measurements of ultrasonic displacements generated both under ablation conditions and under thermoelastic conditions.
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