Abstract
Vortex retarder is a simple and efficient method to generate vortex beams, and the detection of its modulation characteristics is of great significance for the preparation and application of vortex retarder. A quantitative measurement method for the two-dimensional modulation characteristics of vortex retarder based on PIE is presented. By using circularly polarized incident light, the modulation parameters of the vortex retarder are loaded into the beam phase. We report on the experimental demonstration that the high-precision reconstruction results can be achieved by applying the PIE complex amplitude measurements respectively before and after placing the vortex retarder. Based on the measurement result, the actual modulation effect of the measured vortex retarder to incident vector beam is obtained by the matrix operation and diffraction propagation. This method provides a simple and anti-interference means for quantitative detection of wave plates, liquid crystals and vortex beams.
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