基于电光补偿测量的光相位延迟拓展测量法

发布时间：2018-01-29 23:07

  本文关键词： 物理光学 相位偏差 波片 波形　出处：《光学技术》2017年03期 　论文类型：期刊论文

【摘要】：在激光电光调制补偿测量光相位延迟量过程中,加入交流调制电压形成倍频接收信号,获得消光的精确定位,能提高测量精确度。通过调制信号形状变化与相关参量之依赖关系,可拓展测量范围,解决在某些点附近无法测量波片相位的"盲区"问题。根据接收到的调制光信号形状变化趋势与待测波片样品方位、延迟量、旋转方向等条件的联系,在待测波片快轴选定后,通过波片旋转影响信号形状变化规律的观测,可敏锐地甄别在半波点或全波长点附近波片的正负偏差特性,从而解决了一般偏振干涉补偿测量相位无法解决的测量盲区问题。不改变测量系统结构也不需添加任何器件,适应于最小延迟偏差≥λ/360的情况。
[Abstract]:In the process of measuring the optical phase delay by laser electro-optic modulation compensation, the AC modulation voltage is added to form the frequency doubling received signal, and the accurate location of extinction is obtained. It can improve the accuracy of measurement. The range of measurement can be expanded by changing the shape of modulation signal and the dependence of related parameters. The problem of "blind area" in which the phase of wave plate can not be measured near some points is solved. According to the changing trend of the shape of the modulated light signal received, the relationship between the orientation, delay quantity and rotation direction of the wave plate sample to be measured is discussed. After selecting the fast axis of the wave plate to be measured, the positive and negative deviation characteristics of the wave plate near the half-wave point or the whole wavelength point can be discerned acutely by the observation that the wave plate rotation affects the variation law of the signal shape. Thus, the problem of measurement blind area which can not be solved by general polarization interference compensation is solved. The measurement system structure is not changed and no device is added, which is suitable for the case of minimum delay deviation 鈮，

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