新型内反射旋光光学滤波器研究

Study on a novel optical filter by internal reflection and optical rotation

基于氯酸钠晶体的各向同性和旋光色散特性,利用线偏振光以Brewster角内反射时P分量反射率为零的特性,研制出一种新型内反射旋光光学滤波器,该光学滤波器仅需采用单个偏振片,即可达到良好的滤波效果.利用Mueller矩阵对该滤波器的滤波特性进行理论分析以及实验测试,结果表明对含有532nm和632.8nm谱线的线偏振光,改变起偏器角度即可连续调制出射红、绿光的光强,当起偏器较初始位置旋转过133.36°和173.06°时,绿光和红光分别消光,绿光和红光的隔离度可达10dB.

Based on the optical rotatory dispersion and the isotropy of the sodium chlorate crystal,a new type of optical filter by internal reflection and optical rotation is firstly developed.Due to the speciality of the zero reflectivity when the linearly polarized light is reflected at Brewster angle,the optical filter can give a good filtering effect by using only a single polarizer.The filtering characteristics were analyzed by Mueller matrix and tested by experiment.The results show that the intensity of emitted red or green light can be continuously modulated by changing the angle of the polarizer.The extinction of green or red light appears when the rotation angle of the polarizer is respectively 133.36° or 173.06° relative to the initial position.The isolation of green and red can be about 10 dB.