Tailoring ultrasonic beams with optoacoustic holography

Alex Meyer; Stefan Josef Gspan; Stefan Bernet; Monika Ritsch-Marte

doi:10.1117/12.483648

25 June 2003 Tailoring ultrasonic beams with optoacoustic holography

Alex Meyer, Stefan Josef Gspan, Stefan Bernet, Monika Ritsch-Marte

Proceedings Volume 4969, Laser Resonators and Beam Control VI; (2003) https://doi.org/10.1117/12.483648
Event: High-Power Lasers and Applications, 2003, San Jose, CA, United States

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.

Citation Download Citation

Alex Meyer, Stefan Josef Gspan, Stefan Bernet, and Monika Ritsch-Marte "Tailoring ultrasonic beams with optoacoustic holography", Proc. SPIE 4969, Laser Resonators and Beam Control VI, (25 June 2003); https://doi.org/10.1117/12.483648

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