Construction, calibration, and testing of a four‐detector photopolarimeter
Construction, calibration, and testing of a four‐detector photopolarimeter
复制标题
DOI：
10.1063/1.1139971
复制
发表时间：
1988
影响因子：
1.6
通讯作者：
R. Azzam;E. Masetti;I. Elminyawi;F. Grosz
中科院分区：
文献类型：
--
作者：
R. Azzam;E. Masetti;I. Elminyawi;F. Grosz
A computer‐controlled four‐detector photopolarimeter (FDP) has been constructed using four windowless planar‐diffused Si photodiodes, operational amplifiers, an analog‐to‐digital (A/D) converter, and a personal computer with peripherals. A nonplanar light path is selected with incidence angles at the first three detectors of ∼65° and with rotations of ∼45° between the successive planes of incidence. The last detector, which is coated for minimum reflectance, intercepts the beam at a small angle and the residual light it reflects is dumped. A 1‐mW He–Ne laser beam (λ=632.8 nm) passes through the polarizing optics of an ellipsometer to provide the polarization states needed for calibration and testing. With an optimum set of calibration states, the instrument matrix A is determined. The FDP is subsequently tested and found to correctly measure the normalized Stokes parameters of a large number of states with an average absolute error of ∼0.01, which is attributed to imperfections in the calibration optics. ...
