Zhang Mei, Dou Jiantai, Xu Jiaqing, Li Bo, Hu Youyou
Opt Express. 2023 Oct 9;31(21):34954-34962. doi: 10.1364/OE.500141.
In this paper, what we believe to be a new method for the generation of rotationally symmetric power-exponent-phase vortex beams (RSPEPVBs) based on digital micromirror devices (DMD) was proposed and demonstrated. Based on the theory of binary amplitude holography and Lee method, the two-dimensional amplitude holograms for the generation of RSPEPVBs were obtained. Then, the experimental setup was established for the generation of RSPEPVBs based on DMD and to verify the phase structure of RSPEPVBs by the Mach-Zehnder interferometer. The experimental results showed that the RSPEPVBs can be generated based on DMD with high beam quality and stability, and the ±1-order diffracted beams were respectively corresponding to the RSPEPVBs with contrary TCs, which was the first time to report the RSPEPVBs with negative TC. Besides, the overall and ±1-order diffraction efficiencies of RSPEPVBs generated by DMD were 7.18% and 1.73%, respectively. The method can be applied for the generation of RSPEPVBs with different parameters and quickly achieve mode switching by loading different binary amplitude holograms, which provides a new choice for the generation of new structure beams based on DMD.
本文提出并演示了一种基于数字微镜器件（DMD）生成旋转对称幂指数相位涡旋光束（RSPEPVBs）的新方法。基于二元振幅全息理论和李方法，获得了用于生成RSPEPVBs的二维振幅全息图。然后，建立了基于DMD生成RSPEPVBs的实验装置，并通过马赫-曾德尔干涉仪验证了RSPEPVBs的相位结构。实验结果表明，基于DMD可以生成具有高光束质量和稳定性的RSPEPVBs，且±1级衍射光束分别对应具有相反拓扑电荷（TC）的RSPEPVBs，这是首次报道具有负TC的RSPEPVBs。此外，DMD生成的RSPEPVBs的总衍射效率和±1级衍射效率分别为7.18%和1.73%。该方法可用于生成不同参数的RSPEPVBs，并通过加载不同的二元振幅全息图快速实现模式切换，为基于DMD生成新型结构光束提供了新的选择。
