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High-Frequency Modulation of Light by Ultrasonic Progressive Waves

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The known methods for obtaining high-frequency amplitude modulated light, by the diffraction of a light beam, normally crossing ultrasonic fields in a liquid, present severe optical and geometrical precision requirements. A new modulation method is suggested: The simultaneous use of a progressive wave beam associated with an amplitude optical grating. Its application simplifies the usual light modulating arrangements and could increase the practical high-frequency limit for such light modulation methods.

The main modulation characteristics, experimentally observed with an ultrasonic beam of 2 MHz in water, are reported and compared with that obtained by the classical methods. Two properties appear to be rather interesting for the applications:

1) The whole emerging light beam is amplitude modulated, with a suitable degree of modulation, and therefore neither a slit after the light source, nor the usual selection of some diffraction fringes on the focal plane is required.

2) The modulation frequency of the light can be increased simply by reducing the grating spacing, without changing the ultrasonic frequency.

A simple application to distance measurements is suggested.
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Document Type: Research Article

Publication date: January 1, 1969

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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