Laser-induced surface acoustic waves and photothermal surface gratings generated by crossing two pulsed laser beams

Akira Harata, Hiroyuki Nishimura, Tsuguo Sawada

Research output: Contribution to journalArticle

117 Citations (Scopus)

Abstract

Gigahertz surface acoustic waves have been optically generated and detected on aluminum metallic films and silicon wafers using the laser-induced grating technique. The acoustic velocities were in good agreement with those of Rayleigh waves. Photothermal surface gratings could also be detected as a nonpropagating component of the thermoelastic waves. The relaxation time of the grating was related to the thermal diffusivity of the material. A simplified theory for the generation of surface transient gratings containing acoustic waves is presented in addition to the experimental results.

Original languageEnglish
Pages (from-to)132-134
Number of pages3
JournalApplied Physics Letters
Volume57
Issue number2
DOIs
Publication statusPublished - Dec 1 1990
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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