Sakamaki Shota, Yoneda Naru, Nomura Takanori
Appl Opt. 2020 Aug 1;59(22):6612-6618. doi: 10.1364/AO.393176.
Fresnel incoherent correlation holography (FINCH) is a technology that can acquire three-dimensional information of incoherent objects such as fluorescence with an in-line optical system. However, it is difficult to apply FINCH to dynamic phenomena, since FINCH has to detect phase-shifted holograms sequentially to eliminate twin and zero-order images. In this paper, a method in which the phase-shifted holograms can be obtained simultaneously with an in-line setup by using an optimized simulated diffraction optical element (sDOE), realized by a phase-only spatial light modulator, is proposed. The optimized sDOE is an optical device with a dual-focus lens, 2D grating, and spatial phase shifter. Therefore, the sDOE is called a dual-focus checkerboard lens. The optical experiment confirms the feasibility of the proposed method.
菲涅耳非相干相关全息术（FINCH）是一种能够通过同轴光学系统获取诸如荧光等非相干物体三维信息的技术。然而，将FINCH应用于动态现象存在困难，因为FINCH必须顺序检测相移全息图以消除孪生像和零级像。本文提出了一种方法，通过使用由纯相位空间光调制器实现的优化模拟衍射光学元件（sDOE），可以在同轴设置下同时获得相移全息图。优化后的sDOE是一种具有双聚焦透镜、二维光栅和空间相位调制器的光学器件。因此，sDOE被称为双聚焦棋盘透镜。光学实验证实了该方法的可行性。
