We report the realization of precise spatial polarization control of light via a priori optimization of the polarization ratio and retardation modulation in a vectorial optical field generator. For the polarization ratio calibration, we generate 45° linearly polarized light, measure the intensities of the vertical and horizontal components of the output beam and calculate the ratio of them to obtain the modification coefficient. After several iterations, the corresponding coefficient converges to an optimized value based on the criterion that the measured intensities are equal to each other. As for the retardation calibration, circularly polarized light is generated and letting the modulated beam propagate through a circular polarization analyzer. The modification value is adjusted by dichotomy until the detected intensity of the output beam from the circular polarization analyzer approaches extinction. Several typical kinds of vectorial optical beams are generated with the obtained modification parameters and the measured Stokes parameters demonstrate that this method is practicable and beneficial for the performance improvement of the vectorial optical field generator.
Jian Chen, Guanghao Rui, Lingjiang Kong, and Qiwen Zhan, "Parameter optimization of a vectorial optical field generator for precise spatial polarization control," Proc. SPIE 10090, Laser Resonators, Microresonators, and Beam Control XIX, 100901I (Presented at SPIE LASE: February 02, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2250162.
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