Abstract. We propose acousto-optic (AO) polarization switch based on a paratellurite crystal. The geometry of anisotropic interaction is chosen so as to satisfy the Bragg conditions for the two alternative light polarizations at the wavelength 785 nm. For this both the direct and reflected from crystal face acoustic waves are used. The polarization of the output light is governed by switching between one of the two alternative frequencies of a driving ultrasound signal applied to the AO cell. The device is parallax-compensated, so that the light beams with different polarizations leave the cell at the same point, with no transverse shift, and propagate along the same direction. A corresponding AO polarization switch is manufactured and its characteristics are studied experimentally. The measured contrast ratio of the device is better than 1800:1.
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.
We suggest acoustooptic deflector operating at two different light wavelengths. Geometry of paratellurite crystal is chosen such that it simultaneously satisfies the Bragg conditions at those wavelengths. This enables beam steering at either of the wavelengths in the same predefined angular range. The wavelengths are switched by means of changing the sound frequency, so that only one of the wavelengths is available at the output of the deflector at each specific moment of time. A technique for calculations of parameters of the device is described. The deflector has been successfully constructed and investigated experimentally.
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