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Proceedings Paper

Tailoring ultrasonic beams with optoacoustic holography
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Paper Abstract

A combination of laser-induced ultrasound generation and ultrasonic holography for spatial control of the generated ultrasonic pulse is presented. Ultrasound is produced by absorption of laser pulses at an absorbing layer in a water tank via the optoacoustic effect. In order to produce a defined ultrasonic frequency in the MHz range, the laser pulses are harmonically time-modulated using an acousto-optic modulator (AOM). Additionally, the laser intensity is spatially controlled. This is realized with a high resolution liquid crystal spatial light modulator (LCD). A computer generated pattern is displayed at the LCD and projected by the expanded laser beam to an absorptive layer in the water tank. As a result, the emitted ultrasonic wave emerges in a predetermined way, which is an acoustical analogue to the effect of a "diffractive optical element" in laser optics. The flexible method of optical ultrasound generation and diffractive steering promises new applications in medical and technical ultrasound diagnostics.

Paper Details

Date Published: 25 June 2003
PDF: 10 pages
Proc. SPIE 4969, Laser Resonators and Beam Control VI, (25 June 2003);
Show Author Affiliations
Alex Meyer, Univ. Innsbruck (Austria)
Stefan Josef Gspan, Univ. Innsbruck (Austria)
Stefan Bernet, Univ. Innsbruck (Austria)
Monika Ritsch-Marte, Univ. Innsbruck (Austria)

Published in SPIE Proceedings Vol. 4969:
Laser Resonators and Beam Control VI
Alexis V. Kudryashov; Alan H. Paxton, Editor(s)

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