| 摘要 |
A single crystal substrate and a cutting method thereof are provided. The single crystal substrate includes a langasite substrate with a SAW propagation surface; and input and output IDTs having electrodes on the surface for launching and/or detecting surface acoustic waves, wherein a direction of surface wave propagation is parallel to an X'-axis, and the substrate farther has an Z'-axis perpendicular to the surface and a Y'-axis parallel to the surface and perpendicular to the X'-axis, the langasite substrate having a crystal orientation defined by modified axes X, Y and Z, the relative orientation of axes X', Y' and Z' being defined by Euler angles phi, theta and psi, in which phi is in a range of 8°<=phi<=25°, theta in a range of 15°<=theta<=30°, and psi is in a range of 55°<=psi<=85°.
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