摘要
斯托克斯偏振测量常被用于获取光束的偏振特性。提出一种利用偏振无关的达曼光栅快照式测量偏振光束斯托克斯参量的方法。偏振光束通过达曼光栅后在空间对称的位置上被分成4束,这4束光经波片和线偏振器调制后,最终被CCD采集。将单次快照采集的光强图简单叠加运算就可计算得到偏振光束的斯托克斯参量,并可进一步计算得到偏振光束的偏振分布、矢量质量因子(VQF)和模间相位。所提测量方法对不同椭圆偏振光的测量结果与商用偏振测量仪的测量结果之间的平均相对误差为6.97%。所提方法的测量装置简单,无需转动任何器件,单次快照就可完成测量,具有可靠的测量精度。
Objective Polarization is a key parameter of light,accurate and rapid measurement of which plays a significant role in a variety of areas such as remote sensing technology,Mueller matrix measurement,and biological diagnosis.Stokes parameters directly reflect the light intensity of the polarization component of light,and all parameters can be directly determined by the measurement of light intensity.On this basis,the polarization distribution,vector quality factor,and intra-modal phase can be measured.The measurement methods of Stokes parameters mainly include the divisionoftime and divisionof-amplitude methods.The divisionoftime method refers to the measurement of required intensities one by one,which is only applicable to static polarized light.The divisionof-amplitude method can overcome shortcomings encountered by the divisionoftime method,but it also faces many problems such as the complexity of the device,the uneven distribution of light intensity,and different propagation distances.In this study,a Stokes polarimetry method based on a polarization-insensitive Dammann grating is proposed.The Stokes parameters of the polarized beam can be calculated by the intensity spots in a single snapshot,and the polarization distribution,vector quality factor,and intramodal phase of the polarized beam can be further obtained.This method has simple measuring equipment and does not need any rotating components.The measurement can be completed with a snapshot and has reliable accuracy.Methods The measurement principle of the proposed method is described in Fig.1.Formulas for calculating Stokes parameters,the polarization distribution,the vector quality factor,and the intra-modal phase of the polarized light are derived.The experimental setup is built upon the measurement principle.In the experiment,different vector polarized beams,circularly polarized beams,and elliptically polarized beams are generated to measure the target polarized beam.The polarization-insensitive Dammann grating is used to divide the incident polarized
作者
唐凡春
步扬
吴芳
王向朝
Tang Fanchun;Bu Yang;Wu Fang;Wang Xiangzhao(Laboratory of Information Optics and Opto-Electronic Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Zhangjiang Laboratory,Shanghai 201210,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第13期124-133,共10页
Acta Optica Sinica
基金
国家科技重大专项(2016ZX02201-001)
上海市科委项目(18511104500)。
关键词
测量
偏振测量
斯托克斯参量
达曼光栅
measurement
polarimetry
Stokes parameter
Dammann grating
