Abstract
We describe an advanced laboratory experiment in which both Raman-Nath and Bragg diffraction of light by acoustic waves in water are observed in the sound frequency range from 5 to 45 MHz. The apparatus consists of a laser, light detector, rf power source, quartz transducer, and homemade water cell. We discuss the theory of Raman-Nath diffraction, Bragg diffraction, and the criteria for the manifestation of each. The measured Raman-Nath diffracted orders give a visual display of FM sidebands. We discuss a quantitative relationship between the incident and diffracted light and the sound for Bragg diffraction in terms of a three-wave parametric process. Stanford students in the Advanced Applied Physics Laboratory have successfully performed this experiment during the past three years.
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