Abstract
Light diffraction by two ultrasonic waves of frequency ratio 1:2 is examined beyond the Raman–Nath diffraction regime. Measurements were taken of ±1 order diffracted light intensities for some Raman–Nath parameter values, as a function of the phase shift between the sound beams. The experimental results obtained are discussed and compared with relevant theoretical predictions. Within the experimental conditions, a quite good quantitative agreement between the experimental data and the appropriate theoretical expectations is observed.
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