研制了一种结构简单、稳定性好的可见光波段可调偏振度光源, 用来验证偏振光谱强度调制（PSIM）实验系统设计的正确性。该光源内部安装有两块K9玻璃组成的玻璃片堆, 通过改变玻璃片堆的倾角来调整输出的部分偏振光的偏振度。理论推导了二者的关系, 得到了可调偏振度源输出光的偏振度计算方法。根据PSIM系统的实现原理, 搭建了验证PSIM性能的实验装置, 对可调偏振度源输出的不同偏振度谱进行了测量。实验结果表明：在PSIM实验装置的有效工作波段范围内, 可调偏振度源输出光的理论偏振度值与PSIM实验装置测得结果的误差在1%以内, 验证了可调偏振度源及PSIM实验装置设计的正确性。该装置有望成为标准偏振光源, 用于偏振光谱测量装置的精确标定。

A tunable polarization light source with simple structures and good stability was developed to validate the feasibility of a Polarization Spectral Intensity Modulation (PSIM) experimental system designed by us. A glass stack consisting of two K9 glass pieces was mounted into the tunable polarization light source. By changing the tilt angle of the glass stack, the polarization degree of the partial polarization light output from the system could be adjusted. The working principle of the PSIM was derived, and the calculation method of polarization degree of the output light from the tunable polarization light source was obtained. On the basis of the principle of the PSIM system, a experimental device was built to verify the performance of the PSIM system. The measurement verification experiment was carried out in the laboratory and the different polarization degree spectra output from tunable polarization light source was measured. The results show that the error between the theoretical output of the tunable polarization light source and the measured results of the experiment equipment of PSIM is within 1% when the experiment equipment of PSIM works in its effective working wavelength range, which validates the feasibility of experiment device of PSIM and tunable polarization light source. Meanwhile, it verifies that the tunable polarization light source is expected to be a standard polarization light source and used in the calibration of polarization spectral measuring equipment.