Ti扩散LiNbO_3光波导折射率变化研究

Research on the Refractive-index Change Produced by the Ti-diffusion in LiNbO_3

就Ti扩散波导折射率的变化,从弹光效应和电光效应进行了详尽的讨论和分析,结果表明两种效应对折射率变化的贡献在同一数量级;就反转极化Ti扩散波导折射率的变化,从自发极化的角度出发,进行了验证和探讨,结果仍满足Δne>0和Δno>0。

The refractive-index change produced by the Ti-diffusion was discussed using methods of photoelastic and electro-optical tensor matrixes. The results show that the two factors contributed to the refractive-index change are in the same level. Then, the refractive-index change in reverse-poled LiNbO3 was validated and discussed based on spontaneous polarization, and the result shows that it satisfies the conditions of Δne>0 and Δno>0.