Rajagopal, S; Allen, T; Berendt, M; Lin, D; Alam, S; Richardson, D J; Cox, B T (2023) The effect of source backing materials and excitation pulse durations on laser-generated ultrasound waveforms. The Journal of the Acoustical Society of America, 153 (5). pp. 2649-2658.

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Abstract

Laser-generated ultrasound sources consisting of a thin optically absorbing layer supported by a substrate are of increasing interest for industrial, medical and metrological applications due to their very broadband nature. Here, 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.

Item Type:	Article
Subjects:	Acoustics > Ultrasound
Divisions:	Medical, Marine & Nuclear
Identification number/DOI:	10.1121/10.0019306
Last Modified:	04 Dec 2023 11:51
URI:	https://eprintspublications.npl.co.uk/id/eprint/9883