Noncontacting optical generation of focused surface acoustic waves using a customised zoneplate

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Noncontacting optical generation of focused surface acoustic waves using a customised zoneplate

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The use of computer generated holographic zoneplates to enhance the generation of laser ultrasound is described. An amplitude grating capable of focusing laser light onto an arc which in turn generates a near diffraction limited focus of 82 MHz Rayleigh surface waves is also described. The application of zoneplates for ultrasonic nondestructive evaluation and imaging is considered.

Inspec keywords: surface acoustic wave devices; ultrasonic focusing; ultrasonic imaging; zone plates; Rayleigh waves; laser beam applications; acoustic wave production; ultrasonic materials testing

Other keywords: US imaging; near diffraction limited focus; focused surface acoustic waves; amplitude grating; customised zoneplate; laser ultrasound generation; computer generated holographic zoneplates; ultrasonic nondestructive evaluation; 82 MHz; Rayleigh surface waves; noncontacting optical generation

Subjects: Acoustic wave devices; Materials testing; Transduction; devices for the generation and reproduction of sound; Laser applications; Laser beam applications; Nondestructive testing; Ultrasonics, quantum acoustics, and physical effects of sound

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