Research Article

Growth and Characterization of Single Crystalline Bi4Ge3O12 Fibers for Electrooptic High Voltage Sensors

Table 2

Crystal classes with natural birefringence suited for line integration of the electric field.

ClassAxis parallel to light propagationDirection of electrooptical axesMaterials

m 2-fold axis LiNaCO3
2 mm 2-fold axis KPT, KNbO3