基于马赫-曾德尔干涉仪的聚合物电光系数测量方法的性能改善

对基于马赫-曾德尔(Mach-Zehdner)干涉仪的聚合物电光系数测量方法进行了分析。提出了改善性能的方法并进行了讨论。采用光纤干涉仪代替空间光学干涉仪对样品电光系数进行透射式测量,采用压电陶瓷(PZT)片调节测量系统的工作点实现反馈控制,有效地减小了法布里-珀罗(Fabry-Perot)谐振效应的影响;通过精确控制光纤干涉仪干涉臂长差和合理选择光纤耦合器的耦合比,可以提高干涉的可见度,从而提高系统的测量精度。实验结果表明,系统的干涉可见度为0.84,可分辨的最小相位变化约为6×10-6rad。

Performance Improvement on the Measurement of Electro-Optic Coefficients of Poled Polymers Using the Optical Fiber Mach-Zehdner Interferometer

The performance of the electro-optic coefficients measurement system based on the optical fiber Mach-Zehdner interferometer is analyzed. The performance improvement methods are given and discussed. The optical fiber interferometer is used in the improved system instead of the free space one and the measurement is carried out in transmission mode. The piezoelectric tensor (PZT) is adopted to adjust the operation point of the system, which facilitates the feedback control. The undesired Fabry-Perot resonance effect is reduced greatly. By carefully controlling the path difference between the interference arms and choosing the couple ratios of the couplers, the interference visibility can be increased and the measurement precision can be improved in return. Experimental results show that the interference visibility of the system is 0.84 and the phase shift as small as 6×10-6 rad can be detected.