Radially polarized beam restructuring based on Stokes-vector measurement and interferometry

With rapid development of optical manipulation technology, it became urgent to measure and reconstruct the radially polarized beam (RPB). Utilizing a set of quartz rotators, the RPB was prepared firstly. In consideration of optical quality assessment, due to the direct connection with longitudinal component at the focal region, the parameter of polarization orientation and power deviation have been brought up and measured. A method to reconstruct the vector-structure of RPB was designed and implemented. Results show that the normalized amplitude deviation was 0.054 8 and polarization deviation is 0.004 4. Furthermore, by the interferometer, the phase distribution of the RPB has been achieved, and the average phase difference was 1.471 between neighboring sections. Finally, by processing the data of polarization and phase information, the vector-field of the RPB have been successfully reconstructed, the topological charge was 3, which paves the way for accurate quantum manipulation and measurement.