25 April 2005 Synthetic acoustic holograms realized via optoacoustic methods
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Optoacoustic binary holography is applied to gain complete spatio-temporal control over ultrasonic beams. For flexible temporal intensity modulation of the sound-inducing laser light, an electro-optic modulator is used. Furthermore, in order to generate the desired spatial intensity distributions of the ultrasound, a spatial light modulator impresses synthetic binary holograms on the modulated light beam. At a light absorbing surface the optoacoustic effect converts the modulated light wave into an ultrasonic beam that propagates into water in the holographically predetermined way. With this approach we have successfully generated amplitude distributions that are difficult to realize with traditional piezo-electric techniques.
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Stefan Gspan, Stefan Gspan, Alex Meyer, Alex Meyer, Stefan Bernet, Stefan Bernet, Monika Ritsch-Marte, Monika Ritsch-Marte, } "Synthetic acoustic holograms realized via optoacoustic methods", Proc. SPIE 5697, Photons Plus Ultrasound: Imaging and Sensing 2005: The Sixth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, (25 April 2005); doi: 10.1117/12.606207; https://doi.org/10.1117/12.606207


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