Automatic positioning of optical axis of wave-plate in a laser feedback birefringence measurement system
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摘要: 为了解决传统双折射测量系统在调节光学元件的过程中，结构复杂、耗时长且不状态稳定的问题，采用计算偏振跳变曲线中o光和e光低电平占空比的方法，增加了自动旋转波片的功能，优化出一套具有较高工作效率的双折射测量系统。该系统可自动调整波片快轴方向，使其可对准激光器的本征偏振方向，减少了人为判断波片快轴时可能引入的测量误差。结果表明，波片相位延迟的最大偏差为0.65°，标准差降低28%。双折射测量系统的测量精度及稳定性满足工业化生产的要求。Abstract: In order to solve the problem of complex structure, time-consuming and unstable state in the process of adjusting optical elements in a traditional birefringence measurement system, the duty cycles of o light and e light at low levels in polarization flipping curves were calculated.The function of automatic rotating wave-plate was added in a birefringence measurement system optimized with high efficiency.The system can automatically adjust the direction of fast axis of the wave-plate aligned with the intrinsic polarization direction of laser and reduce the measurement error that may be introduced when judging the fast axis of wave-plate artificially.After many measurements, the results show that the maximum deviation of wave-plate phase delay is 0.65°, and the standard deviation is reduced by 28%.The measurement accuracy and stability of birefringence measurement systems have met the requirements of industrial production.
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Table 1 Analysis of duty cycle of the low level of ordinary light and extraordinary light
experiment times the traditional way of
adjusting wave-platethe optimized mode of
adjusting wave-plate1 0.4653 0.4762 2 0.4655 0.4715 3 0.4685 0.4823 4 0.4547 0.4712 5 0.4667 0.4695 6 0.4675 0.4757 7 0.4695 0.4707 8 0.4515 0.4837 9 0.4682 0.4722 10 0.4705 0.4812 average 0.4648 0.4754 standard deviation 0.0064 0.0053 
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Table 2 Analysis of the measured value of phase retardation of λ/4 wave-plate
experiment
timesthe measured value of
the wave-plate before
the system is optimized/(°)the measured value
of the wave-plate after
the system is optimized/(°)1 89.12 89.66 2 89.25 90.07 3 88.77 89.44 4 89.04 89.54 5 89.23 89.77 6 89.07 89.37 7 89.33 89.75 8 88.47 89.90 9 89.42 89.35 10 89.63 89.58 average 89.11 89.64 standard
deviation0.3103 0.2219
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