The effect of source backing materials and excitation pulse durations on laser-generated ultrasound waveforms

In this article, it is shown experimentally that a planar laser-generated ultrasound source with a hard reflective backing will generate higher acoustic pressures than a comparable source with an acoustically matched backing when the stress confinement condition is not met. Furthermore, while the so...

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Bibliographic Details
Published inThe Journal of the Acoustical Society of America Vol. 153; no. 5; pp. 2649 - 2658
Main Authors Rajagopal, Srinath, Allen, Thomas, Berendt, Martin, Lin, Di, Alam, Shaif-ul, Richardson, David J., Cox, Ben T.
Format Journal Article
LanguageEnglish
Published United States 01.05.2023
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Summary:In this article, it is shown experimentally that a planar laser-generated ultrasound source with a hard reflective backing will generate higher acoustic pressures than a comparable source with an acoustically matched backing when the stress confinement condition is not met. Furthermore, while the source with an acoustically matched backing will have a broader bandwidth when the laser pulse is short enough to ensure stress confinement, the bandwidths of both source types will converge as the laser pulse duration increases beyond stress confinement. The explanation of the results is supported by numerical simulations.
ISSN:0001-4966
1520-8524
DOI:10.1121/10.0019306