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

Akira Harata; Hiroyuki Nishimura; Tsuguo Sawada

doi:10.1063/1.103964

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 journal › Article › peer-review

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 language	English
Pages (from-to)	132-134
Number of pages	3
Journal	Applied Physics Letters
Volume	57
Issue number	2
DOIs	https://doi.org/10.1063/1.103964
Publication status	Published - Dec 1 1990
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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AU - Sawada, Tsuguo

PY - 1990/12/1

Y1 - 1990/12/1

N2 - 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.

AB - 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.

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

Abstract

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