单轴晶体电光调制器的温度特性

Temperature Properties of Uniaxial Crystal Electro-Optic Modulator

利用线性电光效应的耦合波理论，对单轴晶体铌酸锂电光调制器的温度特性进行了研究。通过计算机进行数值计算，详细分析出射光光强随入射光方向、温度的变化关系。发现在某些入射光方向上，出射光光强不随温度的变化而变化，并且在该方向附近，角度在一定范围内是可调的，温度的稳定性可以保持。进一步还发现，当极角θ固定在0°，方位角Ф在0～π／2，温度在243～343K范围内变化时，调制器的温度稳定性相当好；另外，当Ф固定在π／8，θ在0～0．0032π范围内变化时，调制器的温度稳定性也很好，出射光强对入射光强之比几乎不随温度而变化。这一结果表明，可以通过调节入射光的方向来保证调制器的温度稳定性，而这些方向是可利用线性电光效应的耦合波理论计算得出的。

A wave coupling theory of linear electro-optic effect is used to investigate the temperature properties of electro optic modulator made by a uniaxial crystal LiNbO3. The dependence of output intensity on the incident direction and the temperature is characterized by numerical calculations. It is found that along some directions, the output intensity of the modulator is insensitive to the temperature within a range of angles. Further, when the polar angleθis set to 0, azimuth angle Ф changes from 0 to π/2 and the temperature T changes from 243 to 343 K, the modulator presents perfect temperature stability. In addition, when Ф is set to π/8 and θ changes from 0 to 0. 0032π, the temperature scarcely has effect on the ratio of output intensity to input intensity. Therefore, the temperature stability can be ensured by adjusting the incident direction of the beam, which can be obtained from the wave coupling theory of linearly electro-optic effect.