Location

La Jolla, CA

Start Date

1-1-1987 12:00 AM

Description

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.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

6A

Chapter

Chapter 1: General Techniques—Fundamentals

Section

Other Techniques

Pages

459-465

DOI

10.1007/978-1-4613-1893-4_52

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Optical Generation of Coherent Ultrahigh Frequency Surface Waves

La Jolla, CA

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.