Nobukawa Teruyoshi, Katano Yutaro, Goto Masahide, Muroi Tetsuhiko, Hagiwara Kei, Ishii Norihiko
Opt Express. 2022 Jul 18;30(15):27825-27840. doi: 10.1364/OE.460187.
Incoherent digital holography (IDH) with a sequential phase-shifting method enables high-definition 3D imaging under incoherent lights. However, sequential recording of multiple holograms renders IDH impractical for 3D videography. In this study, we propose grating-based in-line geometric-phase-shifting IDH. Our method divides orthogonal circularly polarized lights into four copies with a fabricated phase grating and subsequently creates self-interference holograms with geometric phases introduced by a segmented linear polarizer. This enables single-shot recording of holograms without the need for a specially designed image sensor, such as a polarization-sensitive sensor. Moreover, the achievable spatial resolution is higher than that of off-axis methods. As a proof-of-principle experiment, we demonstrated snapshot and video recording of 3D reflective objects using our IDH method. The results confirmed the feasibility of the proposed method.
采用顺序相移法的非相干数字全息术（IDH）能够在非相干光下实现高清三维成像。然而，多个全息图的顺序记录使得IDH在三维摄像中不切实际。在本研究中，我们提出了基于光栅的同轴几何相移IDH。我们的方法用制造的相位光栅将正交圆偏振光分成四份，随后通过分段线性偏振器引入的几何相位创建自干涉全息图。这使得无需诸如偏振敏感传感器等专门设计的图像传感器就能单次记录全息图。此外，可实现的空间分辨率高于离轴方法。作为原理验证实验，我们使用我们的IDH方法演示了三维反射物体的快照和视频记录。结果证实了所提方法的可行性。
