Optics Communications ( IF 2.125 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.optcom.2020.125317 Peng Zhang, Xiaoping Du, Jing Wu, Yishuo Song, Yu Jia, Jun Sun, Jiguang Zhao
Electro-optic crystals are extensively utilized to manipulate polarized light. In this paper, a general and accurate three-dimensional polarization ray tracing calculus for characterizing the evolution of polarization state in electro-optic crystals is reported for the first time. The analytical formulas of the parameters describing the propagation properties of the light passing through an electro-optical crystal with an arbitrary incident direction are derived. The partial interference between the divergent light beams is considered in the proposed calculus. Both experiments and calculations on an electro-optic modulator based on a lithium niobate crystal over the azimuth angle of 0-360°and the incidence angle of 0-3°are presented as an example. The experimental results show very good agreement with the theoretical results.