Abstract We propose a configuration of Fourier ptychographic microscopy (FPM) to modulate the focus to a large extent. FPM is widely used to obtain high-resolution images in a wide field of view. A conjugation mirror with an axially scannable mirror is introduced to conventional FPM to extend the focus range. The proposed FPM provides a wider field of view with higher resolution compared to general microscopy using the same numerical aperture. In addition, it can measure a wider focus range. Therefore, it is expected to be applied to volumetric samples more easily compared to FPM. The proposed technique is validated by measuring resolution while moving the United States Air Force resolution chart up to ± 2 mm in the axial direction and experimentally verified by measuring a volumetric sample with a depth of 4 mm created using bead with 1 μm of diameter.

中文翻译：

---

使用共轭光学扩展焦距范围的傅立叶 ptychographic 显微镜

摘要 我们提出了一种傅立叶 ptychographic 显微镜 (FPM) 的配置，以在很大程度上调节焦点。FPM 被广泛用于获得宽视野中的高分辨率图像。将带有轴向扫描镜的共轭镜引入传统 FPM 以扩展聚焦范围。与使用相同数值孔径的普通显微镜相比，所提出的 FPM 提供了更宽的视野和更高的分辨率。此外，它还可以测量更宽的焦距范围。因此，与 FPM 相比，它有望更容易地应用于体积样品。