Wang Yu, Li Huaming, Hu Qinglei, Chen Ruixi, Lv Xiaohua, Zeng Shaoqun
Opt Lett. 2020 Dec 15;45(24):6639-6642. doi: 10.1364/OL.409862.
Digital micromirror devices (DMDs) have shown their potential in 2-photon imaging and microfabrication as diffractive scanners for femtosecond lasers. However, the scanning range of a DMD-based scanner is decreased by the spatial filter (SF) used to block undesired diffraction orders. Instead of an SF, we present a method of introducing and correcting aberration (ICA) to reduce the effects of these undesired diffraction orders. In ICA, aberrations are introduced by optical elements, and only the aberration of the desired diffraction order is corrected by adding a compensatory phase to the scanning phase. The scanning ranges in the and directions can be nearly doubled when the SF is removed. We demonstrate that ICA can be conveniently applied to a previously constructed DMD-based 2-photon microscope, and the field of view can be extended at different axial positions.
数字微镜器件（DMD）作为飞秒激光的衍射扫描仪，已在双光子成像和微加工中展现出其潜力。然而，基于DMD的扫描仪的扫描范围会因用于阻挡不需要的衍射级次的空间滤波器（SF）而减小。我们提出了一种引入和校正像差（ICA）的方法，以减少这些不需要的衍射级次的影响，而不是使用空间滤波器。在ICA中，像差由光学元件引入，并且仅通过向扫描相位添加补偿相位来校正所需衍射级次的像差。当移除空间滤波器时，x和y方向的扫描范围几乎可以翻倍。我们证明ICA可以方便地应用于先前构建的基于DMD的双光子显微镜，并且可以在不同轴向位置扩展视野。
