Wavefront measurement of vortex beam using ptychographic phase retrieval
Wavefront measurement of vortex beam using ptychographic phase retrieval
复制标题
使用叠层相位检索对涡旋光束进行波前测量
DOI：
10.1117/12.2235725
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Hidekazu Mimura
中科院分区：
文献类型：
--
作者：
Takahiro Saito;Yoko Takeo;Hidekazu Mimura
对于涡旋光束，光学系统的表征和优化是重要的。然而，聚焦涡旋光束的波前测量是困难的，因为它们具有复杂的相位和强度分布。作为一种测量方法，我们提出了使用重叠关联，其中使用几个远场衍射图案检索光束的强度和相位。我们建立了一个光学系统与He-Ne激光光源，以澄清重叠的有用性。测试涡旋光束由空间光调制器（SLM）产生，并由平凸透镜聚焦。在焦平面上扫描针孔以收集衍射强度分布。对涡旋光束在焦平面上的相位和强度进行了反演，使计算结果与强度数据一致。检索的强度和相位分布进行了比较与使用SLM的输入预测的分布。这表明重叠关联相位恢复方法可以用于涡旋光束的精确表征。该方法对于提高涡旋光束应用的性能具有重要意义。
For vortex beams, characterization and optimization of the optical system are important. However, wavefront measurements on focused vortex beams are difficult because they have complex phase and intensity distributions. As a measurement method, we proposed the use of ptychography, in which the intensity and phase of the beams are retrieved using several far-field diffraction patterns. We constructed an optical system with a He-Ne laser light source to clarify the usefulness of ptychography. Test vortex beams were produced by a spatial light modulator (SLM) and focused by a plano-convex lens. A pinhole was scanned on the focal plane for collection of the diffraction intensity profiles. The phase and intensity of the vortex beams on the focal plane were retrieved so that the calculated beams were consistent with the intensity data. The retrieved intensity and phase distributions were compared with distributions predicted using the inputs for the SLM. They agreed well, indicating that the ptychographic phase retrieval method can be used for precise characterization of vortex beams. This method is valuable for improving the performance of applications using vortex beams.