We consider simultaneous diffractions of light by two lobes of sound radiation pattern in an acousto-optic modulator which is built on SiO 2 single crystal and has two-element phased-array transducer with the fixed phase shift .Implementation of this diffraction type greatly improves power efficiency of the device. Transducer shaping is used to steer the lobes and satisfy the Bragg's conditions for simultaneous acousto-optic diffractions. The conditions of the diffraction are defined and a mathematical model for calculating diffraction efficiency is suggested. It is shown that a parallel diffraction regime is almost three times more energy-efficient than a serial regime. Several configurations of transducer elements' shape are analyzed. In particular, changes in the dimensions of diamond-shaped elements are shown to allow adjusting the operating frequency within 23%. An experimental sample of the device is built.
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