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The acousto optic crystal works in Bragg configuration. The page calculates the diffraction efficiencies at the optimal acoustic frequency and at a frequency shifted from the optimum value. It Calculates also the relative loss of diffraction efficiency induced by the frequency shift. These parameters are calculated as functions of the velocity and optimal frequency of the acoustic wave, the refraction index,the interaction length, the interaction width, the merit factor, the acoustic power, the optical wavelength and the acoustic frequency shift.