Interferometric Method for Measuring Ultrasonic Light Diffraction Spectra

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Abstract
An interferometric method for measuring light diffraction spectra of phase gratings produced by ultrasonic sound waves travelling in media is described. The diffracted light beam is heterodyned by the reference light beam coming from the same He-Ne gas laser as for the diffracted beam. Since the frequency of the diffracted beam is shifted according to that of the ultrasonic waves and the spectral order, the spectra are obtained by measuring the beats between two beams. Clear spectra were obtained for the waves travelling in water and the method will have various applications, such as exact measurements of the velocities and the pressure amplitudes of sound waves in media.

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