Optical Generation of Coherent Ultrahigh Frequency Surface Waves
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
It has been demonstrated [1–4] that coherent bulk acoustic waves can be holographically induced by the interference pattern of two intersecting picosecond laser pulses. The coupling between the optical and elastic fields can either be due to electrostriction or optical absorption which produces thermal stresses. The resulting waveform can then be detected by a third time-delayed laser pulse which diffracts off the density grating of the wave field. The elastic response within the laser spot caused by either coupling mechanism has been shown to consist of 1-D counter-propagating pressure waves. From the frequency and attenuation of the diffracted signal, the wavespeed and attenuation coefficient, respectively, of the medium can be obtained.