基于相干涡旋位相调制的偏振可调柱状矢量偏振光的产生

Generation of Polarization-Adjustable Cylindrical Vector Beams Based on Vortex Phase Modulation and Interference

柱状矢量偏振光可广泛应用于光刻、光学微加工、光镊和光学超分辨等技术领域。为了解决现有产生柱状矢量偏振光装置结构复杂和偏振不可调等问题,从理论和实验两方面对基于相干涡旋位相调制的柱状矢量偏振光束的产生进行了研究。理论上分析和证明了相干涡旋位相调制产生偏振可调柱状矢量偏振光方案的可行性,并模拟了径向偏振光和切向偏振光经过检偏器的光强分布。同时,实验证明了理论的正确性,并通过旋转两涡旋位相板的相对角度,将获得的径向偏振光转换为切向偏振光,实验结果与理论分析一致。

Cylindrical vector beam can be widely used in the fields of photoetching, optical micro processing, optical tweezers and optical superresolution. To overcome the existing problems of the complexity of its setup and the unadjustable polarization, generation of cylindrical vector beam with adjustable polarization based on vortex phase modulation and interference is studied both theoretically and experimentally. Feasibility of our scheme is proved in theory, and intensity distributions of radially polarized beam and azimuthally polarized beam are simulated. Meanwhile, related experiments are conducted to prove the correctness of the theory. By rotating the relative angle between two vortex phase plates, the obtained radially polarized beam can be changed into azimuthally polarized one. Experimental results are agree with the theoretical analyses.