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2 Mar 1998

Volume 72, Issue 9, pp. 1001-1123

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Laser generation of ultrasound using a modulated continuous wave laser diode

S. G. Pierce, B. Culshaw, and Q. Shan

Appl. Phys. Lett. 72, 1030 (1998); http://dx.doi.org/10.1063/1.120955 (3 pages) | Cited 25 times

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A modulated continuous wave diode laser was used to generate ultrasonic Lamb waves in a thin steel plate. No surface damage was evident on the sample, a feature due to the low power density of the acoustic source in contrast to the high power pulsed laser systems usually employed for laser-ultrasound generation. The Lamb waves were monitored using a surface bonded optical fiber interferometer whose output was correlated with the pseudorandom binary sequence used to modulate the laser diode. In this fashion, it was possible to record a time domain history of the ultrasonic propagation in the sample. © 1998 American Institute of Physics.
Show PACS
43.35.Ud Thermoacoustics, high temperature acoustics, photoacoustic effect
62.65.+k Acoustical properties of solids
43.38.Zp Acoustooptic and photoacoustic transducers
43.38.Rh Surface acoustic wave transducers
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
61.82.Bg Metals and alloys
79.20.Ds Laser-beam impact phenomena
43.35.Pt Surface waves in solids and liquids
68.35.Gy Mechanical properties; surface strains
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