One of the most important components for acousto-optic devices is piezoelectric transducer converting electrical signal into the ultrasonic wave - crystal atomic lattice deformation.
Among many known crystals LiNbO3 (Lithium Noibate) crystals are used for AO devices based on TeO2. Lithium Noibate crystal has acoustic anisotropy and different shears generates different acoustic wave types. Two LiNbO3 orientation exhibit large piezoelectric coupling, the yz plane orientation and the xy plane orientation. Figure shows the piezoelectric coupling of LiNbO3 in the yz and xy plane. For longitudinal excitation, the 36˚ Y-cut orientation in the yz is preferred because no shear mode coupling is present. In this direction the longitudinal mode piezoelectric coupling constant is 0.49. Such shear is used for manufacturing of transducers based on TeO2 with sound propagation in (001). For shear mode excitation, either the 163˚ Y-cut orientation in the yz plane or an X-cut orientation in the xy plane is preferred. The X-cut orientation is usually used to excite shear waves in deflector devices because it has a higher shear mode coupling constant (0.48 versus 0.36), it excites a pure mode and there is no coupling to the quasilongitudinal mode. There is, however, coupling to the orthogonal shear mode. In those cases where orthogonal shear mode coupling must be suppressed, the 163˚ Y-cut orientation in the yz plane is used.
We supply following blanks for transducers:
36˚ Y-cut orientation
163˚ Y-cut orientation
X-cut 41˚ orientation
as a wafer with thickness 1-2 mm and sizes up to 50х50 mm.
Surfaces can be grinded as well as one side polished and one electrode coated (typically Cr-Au).
 Xu J and Stroud R 1992 Acousto-Optic Devices (New York:Wiley)
 Handbook of optics. CHAPTER 12 ACOUSTO-OPTIC DEVICES AND APPLICATIONS I. C. Chang
 Goutzoulis A and Pape D 1994 Design and Fabrication of Acousto-Optic Devices (New York: Dekker)