Generation and detection of broadband laser generated ultrasound from low-power laser sources

Kathryn Atherton; Brian Culshaw; Fengzhong Dong; Pan Jun; S. Gareth Pierce; Colin I. Swift

doi:10.1117/12.441302

25 September 2001 Generation and detection of broadband laser generated ultrasound from low-power laser sources

Kathryn Atherton, Brian Culshaw, Fengzhong Dong, Pan Jun, S. Gareth Pierce, Colin I. Swift

Proceedings Volume 4417, Photonics 2000: International Conference on Fiber Optics and Photonics; (2001) https://doi.org/10.1117/12.441302
Event: Photonics 2000: International Conference on Fiber Optics and Photonics, 2001, Calcutta, India

Abstract

This paper presents the basic principles of the laser generation of ultrasound (LGU) through thermal conversion and illustrates the approaches to its use in material evaluation using the broadband features of the source. Traditional LGU involves high energy optical pulse irradiation which often induces surface damage, especially in carbon or glass fiber composites. We therefore expand the concept into low power excitations using laser diode sources. This enables excitation without damage but requires coded temporal signals. Arrays of semiconductor laser sources can also produce very broadband acoustic signals, both temporally and spatially. Piezoelectric sources are usually the opposite constrained in both space and time. This basic observation opens new avenues of material investigation, some of which feature in this paper.

Citation Download Citation

Kathryn Atherton, Brian Culshaw, Fengzhong Dong, Pan Jun, S. Gareth Pierce, and Colin I. Swift "Generation and detection of broadband laser generated ultrasound from low-power laser sources", Proc. SPIE 4417, Photonics 2000: International Conference on Fiber Optics and Photonics, (25 September 2001); https://doi.org/10.1117/12.441302

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