In modern engineering measurement, higher performance of illuminants is required to adapt the present engineering technical specifications for which have been demanded increasingly. An illuminant system with high extinction ratio and poly polarization was designed, based on the influence of the crystal birefringence and phase retardation on polarization state, as well as the relationship between the light refraction angle and the vibration direction, and a test program to verify the polarization state and extinction ratio of the emitting light in the system was designed. The illuminant system could easily output the polarized light including S polarization, P polarization and circular polarization by the computer-precisely-controlled stepping motor, and the system obtained the polarized light with high extinction ratio using the polarizing prism which was controlled by the translation and rotation device, and the extinction ratio of emitting light was no more than 5 × 10-6.%在现代工程测量中,由于工程的各项技术指标要求越来越高,相应地对光源也提出了更高的要求.依据晶体双折射和晶体相位延迟对光偏振态的影响以及光的折射角与光振动方向有关的原理,设计了高消光比多偏振态光源系统,并设计测试方案对该系统实现的偏振态和消光比进行了验证.该光源系统通过计算机精密控制电机旋转设计的转盘结构很方便快捷地实现了S偏振态、P偏振态和圆偏振光的输出,并且系统中设计了平移和旋转装置自动控制偏振棱镜,获得了高消光比的偏振光,出射光消光比小于等于5×10-6.
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