Abstract
A general expression for the amplitude of diffracted light under collinear interaction of Gaussian acoustic and light beams is obtained. It is shown that, if the radius of the acoustic beam has a finite value, the central frequency of the transmission curve shifts with respect to a point corresponding to the exact Bragg condition. The value of the light beam radius can increase or decrease this shift for upshifted or downshifted diffraction respectively. An optimum relationship between the interaction length and the acoustic beam radius is found. This optimum condition is related to a minimum of input acoustic power.
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