双折射晶体激光传输的热光效应与电调制机理

Thermo-Optic Effect and Electrical Modulation Mechanism Studying of Laser Transmission in Birefringence Crystal

本文基于多物理场数值仿真平台COMSOL的RF射频模块,通过有限元法求解电磁场频域分析方程,求解了高斯激光在双折射晶体中的传输问题,重点分析了波长,温度和外加电场强度对o光e光离散角和e光波形的影响。研究结果表明温度升高使得离散角变小,接收屏上e光波形向左偏移,而Z方向外加电场强度正向增大则会使o光e光离散角增大,接收屏上e光波形向右偏移。上述研究结果验证了通过改变外加电场来调节温度影响的可行性,为设计一种消除温度效应的光信号调制装置提供了理论依据和基础。

The RF radio module in the multi-physic numerical simulation platform COMSOL is used in the research,the electromagnetic wave equations in frequency domain is solved by finite element method and Gaussian laser transmission problems in birefringence crystal is simulated.Effects of wavelength,temperature and electric field intensity on the discrete angle and waveform of e light are analyzed.The results show that with the temperature increases,the discrete angle will become smaller and e optical waveform will move to the left;while with the applied electric field strength increases forward in the Z direction,the discrete angle will become larger and the e optical waveform will move to the right.The study results verify the feasibility of changing the temperature effects by adjusting the applied electric field,which provide a theoretical basis for the design of an optical signal modulation device used to eliminate the temperature effect.