Design of optical field polarization detection system

Accurate polarization detection of light can extract a lot of optical information from them for related field analysis. A four channel detection device based on Stokes parameters is developed for dynamic polarization measurement. Four independent Stokes parameters S0, S1, S2, and S3 can be measured by this device. An energy meter is used for different incidence statuses of incident light polarization measurement. Again through the device to measure the same incident light. The polarization of the incident light is obtained by measurements of parameter calculation. Using some measurements on the polarization ratio coefficient modification, with other measurements in the revised formula calculation of the degree of polarization. The accuracy of the device is verified by comparing it with the measurement results of the power meter. By calculating Stokes parameters, the ellipse and direction angle of the single pixel polarization ellipse is obtained. The angle that was calculated can be used to obtain the polarization state of each pixel point, and draw the polarization ellipse of the whole light spot. By placing optical elements such as wave plate and polarization splitting prism in front of the optical path, the polarization state of incident light can be changed. Stokes parameters can be measured and calculated again when the light has been changed. Also, the polarization graph can be drawn. Because the change of the incident light can be controlled by the optical element, the polarization state of the incident light can be modulated. By comparing the final overall image with the polarization state of the incident light which has been modulated by the optical elements, the accuracy of the overall polarization state calculation can be verified.