Piezoelectric crystal element on the basis of GAPO4

摘要

In order to improve the temperature stability of piezoelectric and elastic properties of piezoelectric crystal elements based on GaPO4, preferably for resonator applications, and to facilitate alignment when the crystal elements are cut from the raw crystal bars, the proposal is put forward that the principal plane H of the crystal element be parallel to a cutting plane, which is generated by rotating a hexagonal prism face of a raw crystal bar, which lies parallel to the optical axis, around one of the two-fold crystallographic symmetry axes a1, a2 or a3 through an angle theta of -5 DEG to -22 DEG .