Abstract
We study acousto-optic Bragg diffraction of three-colour radiation having wavelengths of 488, 514 and on a single acoustic wave propagating in a crystal. A technique is developed that allows one to find diffraction regimes with a proportional change in the intensity of all radiations by varying the acoustic power. According to the technique, radiation with a maximum wavelength has to be in strict Bragg synchronism with the acoustic wave, while other radiations diffract during the synchronism detuning. The results obtained using this technique are experimentally confirmed.
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