Synthetic acoustic holograms realized via optoacoustic methods
Synthetic acoustic holograms realized via optoacoustic methods
复制标题
通过光声方法实现合成声全息图
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Ritsch
中科院分区：
文献类型：
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作者：
Stefan Gspan;Alex Meyer;S. Bernet;M. Ritsch
应用光声二元全息术来获得对超声波束的完全时空控制。为了对声诱导激光进行灵活的时间强度调制，使用了电光调制器。此外，为了生成所需的超声波空间强度分布，空间光调制器将合成二元全息图压印在调制光束上。在光吸收表面，光声效应将调制光波转换成超声波束，超声波束以全息预定方式传播到水中。通过这种方法，我们成功地生成了传统压电技术难以实现的振幅分布。
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.