由共用镜坯、径向折叠的多个环带反射镜组成的成像系统具有紧凑化、免装调的特点。为确保各反射镜的面形精度和相互位姿精度，提出了计算全息（Computer Generated Hologram, CGH）补偿干涉测量方法。针对可见光/近红外成像需求，基于共轴折叠思路设计了环带四反射镜成像系统；应用金刚石车削工艺加工了多环带共体反射镜；重点针对其中共体的主镜、三镜和次镜、四镜分别设计了CGH补偿器，通过合理选择离焦载频和CGH轴向位置，有效分离了干扰衍射级次的鬼像，实现了多个反射镜面形与相互位姿误差的同步检测。干涉测量结果表明，多个反射镜同时达到接近零条纹状态，面形精度和相互位姿精度较高，且无鬼像干扰。系统对100 m远处目标探测实验表明，反射镜不需要额外装调即可实现良好成像，具有集成度高、研制周期短、成像质量高的优点。

Lipid imaging by conventional photoacoustic microscopy subjects to direct contact sensing with relatively low detection bandwidth and sensitivity, which induces superficial imaging depth and low signal-to-noise ratio (SNR) in practical imaging scenarios. Herein, we present a photoacoustic remote sensing microscopy for lipid distribution mapping in bio-tissue, featuring noncontact implementation, broad detection bandwidth, deep penetration depth, and high SNR. A tailored high-energy pulsed laser source with a spectrum centered at 1750 nm is used as the excitation beam, while a cofocused 1550 nm continuous-wave beam is used as the probe signal. The pump wavelength is selected to overlap the first overtone of the C-H bond in response to the intensive absorption of lipid molecules, which introduces a much-enhanced SNR (55 dB) onto photoacoustic remote sensing (PARS) signals. Meanwhile, the optical sensing scheme of the photoacoustic signals provides broadband detection compared to the acoustic transducer and refrains the bio-samples from direct contact operations by eliminating the ultrasonic coupling medium. Taking merits of the high detection sensitivity, deep penetration depth, broadband detection, and high resolution of the PARS system, high-quality tissue scale lipid imaging is demonstrated in a model organism and brain slice.

与传统的面阵成像技术不同，单像素成像技术作为一种新型的计算成像技术，使用不具备空间分辨能力的桶探测器，结合空间光场调制技术，通过关联算法重构待成像物体的空间强度信息，在研究界得到了广泛的关注。近年来，单像素成像技术被广泛应用于各种波段的成像领域，尤其是在某些面阵探测器价格昂贵甚至无法制备的特殊波段，单像素成像技术逐步发展为一项低成本高成像质量的替代技术。并且，在三维成像技术中，大量基于单像素成像的相关研究工作也被相继提出。文中主要介绍了单像素成像技术的基本原理及应用发展历程，并着重介绍了其在条纹结构投影三维成像技术中的应用工作。