Acousto-optic (AO) devices are important spatial light modulators. They can be used as light-beam deflectors, rf true-time-delay lines, etc. To increase their spur-free dynamic range, we present what to our knowledge is a novel multichannel AO device structure, in which different channels have different carrier frequencies, so a wideband signal can automatically be decomposed into a set of narrow-band signals. Design, fabrication, and testing of this 24-channel, 10-mus AO spatial light modulator are addressed.
Direction [110] in the TeO 2 crystal has unique acoustic and acousto-optic properties. This direction is widely used in many applications. But a slow shear acoustic wave travelling in this direction looks very unpromising for multichannel acousto-optic cells because of its low channel-to-channel isolation under reasonable channel package density.This low isolation is due to the abnormally high physical spread of this slow shear wave travelling in the [110] direction, and the therefore high value of the acoustic anisotropy coefficient b = 26. During recent investigations, a direction exhibiting self-collimation with the coefficient b ≈ 0.3 was found. This direction lies in the optical plane under the angle of 29 o with respect to the [110] axis. But the acousto-optic figure of merit M 2 appears smaller for this direction.A number of directions in the TeO 2 crystal's optical plane combining acceptable values of the acousto-optic figure of merit M 2 and channel-to-channel insulation under high channel package density have been experimentally and theoretically studied. Discussed and analyzed are the features of these directions when they are used in multichannel acousto-optic cells with the wideband anisotropic diffraction.
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