TITLE

Efficient generation of surface acoustic waves by thermoelasticity

AUTHOR(S)
Arnold, W.; Betz, B.; Hoffmann, B.
PUB. DATE
October 1985
SOURCE
Applied Physics Letters;10/1/1985, Vol. 47 Issue 7, p672
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Short laser pulses were used for generating surface acoustic waves (SAW’s) on optically opaque solids via the thermoelastic effect. The spatial and temporal shapes of the laser pulses were either a spot or a line of variable total width δ=2a with a Gaussian power distribution. Maximal efficiency is obtained when a=vRτ(vR[ATOTHER]@B:[/ATOTHER] Rayleigh velocity, 2τ: total laser-pulse length). This condition is caused by interference effects between the individual frequency components radiating from the area of the thermoelastic source. If the intensity of the laser beam were 100% modulated at a given frequency, maximal efficiency would occur if kR=(2)1/2/a (kR[ATOTHER]@B:[/ATOTHER] wave vector of the SAW’s).
ACCESSION #
9818267

 

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