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23 January 2002 Asymmetric channel isolation in multichannel acousto-optic cells made of tellurium dioxide crystal
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Direction [110] in the TeO2 crystal has unique acoustic and acousto-optic properties. This direction is widely used in many applications. But a slow shear acoustic wave traveling 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 traveling in the [110] direction, and the therefore high value of the acoustic anisotropy coefficient b equals 26. During recent investigations, a direction exhibiting self-collimation with the coefficient b approximately equals 0.3 was found. This direction lies in the optical plane under the angle of 29 degree(s) with respect to the [110] axis. But the acousto-optic figure of merit M2 appears smaller for this direction. A number of directions in the TeO2 crystal's optical plane combining acceptable values of the acousto-optic figure of merit M2 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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Sergei V. Kulakov, Victor V. Kludzin, Victor V. Molotok, and Vladimir S. Kulakov "Asymmetric channel isolation in multichannel acousto-optic cells made of tellurium dioxide crystal", Proc. SPIE 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, (23 January 2002);

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