Generation and detection of thermoelastic waves in metals by a photothermal mirror method

We investigate the thermoelasticwaves launched by a localized heat deposition. Pulsed laser excitation is used to generate mechanical perturbations in metals that aredetected using thephotothermalmirror method. This methoddetects the wavefront distortion of the probe beam reflected from the perturbed sample surface. Nanometer scale expansion of the material is induced just under the irradiated surface releasing transient thermoelasticwaves of much smaller amplitudes on the surface. Numerical predictions and the experimental results are in a good agreement and represent both the thermal diffusion of the large amplitude, long-lasting outward bulge, and the releasedelastic waves.

Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: O. A. Capeloto, V. S. Zanuto, G. V. B. Lukasievicz, L. C. Malacarne, S. E. Bialkowski, T. Po žar and N. G. C. Astrath Source Type: research