Electro-optic modulation experiments for light propagating bias the optic axis inLiNbO_3

摘要

Characteristic of electro-optic modulation of light propagating near the optic axis in a uniaxial crystal is well known but not for the cases of propagating bias the optic axis. In this paper, two pairs of LiNbO_3 crystal plates with the same sizes consist of an optical system in where the sum of geometrically optical length of o-ray and e-ray is equal. And then the characteristics of electro-optic modulation of light propagating bias the optic axis in LiNbO_3 are studied experimentally through a coherent received system. The additional phase shift caused by electro-optic effect is measured. The relation of phase shift varying with applied electric-field is reported when the angle between incident beam and the optic axis is 45°. Based on above experiments, a new 90° optical hybrid will be developed.