A Basic Complete Numerical Toolbox for Picosecond Ultrasonics

摘要： A complete numerical complete toolbox is proposed concerning the simulation of photo-induced propagative mechanical wave, and concerning the optical re?ectometric measured response of the material, which is initially exposed to a ?rst pump laser beam that photo-induces the acoustic wavefronts. The deformation ?eld and its propagation into a bulk material are simulated. Based on this ?eld expression, the complex transient re?ectivity is given for a medium considered as homogeneous. The real part of this quantity permits afterwards to propose a numerical simulation of the transient re?ectivity, which corresponds to the optical signal measured during experimental works. The frequency acoustic spectrum is simulated and successfully compared to the measured frequency spectrum. For the ?rst time, numerical complete developments are explicitly proposed and fully-developed under the SciLab R(cid:13) environment, related to the simulation of laser-induced picosecond acoustic wavefront photogenerated through an opto-acoustic transduction process (ultrasonics and pretersonics).