中文摘要：

研究了长度伸缩振动的光弹调制器的工作原理并进行振动分析。各向异性的压电石英在驱动电压下振动,当驱动方波信号频率与两块晶体的本征频率相匹配时,与压电石英用硅橡胶柔性连接的熔融石英随之共振,在两块晶体中传播的是同频率的纵驻波,光弹调制器整体作一维长度伸缩振动。将光弹调制器的振动等效为有阻尼的弹簧-质量块系统进行理论推导,得出振幅表达式,振动位移与驱动电压和光弹调制器的品质因数Q值成正比。最后通过有限元仿真与测振实验测量自制的光弹调制器的振动特性来验证推导的正确性。

英文摘要：

The operating principle of photoelasitc modulator with the length stretching vibration has been investigated and the vibration analysis of the photoelastic modulator has been carried out.The anisotropic piezoelectric quartz vibrates at the driving voltage.When the frequency of the driven square wave signal matches the intrinsic frequency of the two crystals,the fused quartz which is flexibly connected with the silicon rubber of the piezoelectric quartz will resonate.The longitudinal standing wave with same frequency propagates in the two crystals,while the photoelastic modulator as a whole vibrates with one-dimensional length stretching.The vibration of photoelastic modulator can be equivalent to a damped mass-spring system and then the expression of the amplitude can be derived.The vibration displacement is proportional to the Qvalues of the driven voltage and the photoelastic modulator.Finally,the vibration characteristic of the homemade photoelastic modulator has been measured through the finite element simulation and the vibration measurement experiment to verify the validity of the theoretical derivation.