针对目前的红外成像光学系统在机器视觉工业检测领域难以同时实现成像质量好和结构紧凑设计的问题，提出了一种宽光谱可见-短波红外成像光学系统的设计方法。运用光学设计软件ZEMAX设计了一种适用于可见光和短波红外的红外成像光学系统。该系统由7组10片透镜组成，利用多组双胶合透镜来消色差，在第15个面使用非球面提高成像质量，最后对系统的成像质量进行研究。设计结果表明：该系统的的工作波长为0.4~1.7 μm，全长为79.6 mm，F数为2.8，焦距为25.7 mm，畸变小于1.4%，调制传递函数值在奈奎斯特频率100 lp/mm处均大于0.4 ，接近衍射极限，成像质量良好。该系统可以对光滑表面的装配件进行缺陷检测，具有结构简单、易于加工装调的优点，有助于高效地完成机器视觉检测。

A quantum sensor network with multipartite entanglement offers a sensitivity advantage in optical phase estimation over the classical scheme. To tackle richer sensing problems, we construct a distributed sensor network with four nodes via four partite entanglements, unveil the estimation of the higher order derivative of radio-frequency signal phase, and unlock the potential of quantum target ranging and space positioning. Taking phased-array radar as an example, we demonstrate the optimal quantum advantages for space positioning and target ranging missions. Without doubt, the demonstration that endows innovative physical conception opens up widespread application of quantum sensor networks.

Among many multi-dimensional information sensing methods such as structured-light and single-pixel imaging technologies, sinusoidal fringe generation is general and crucial. Current methods of sinusoidal fringe generation force concessions in either the speed or the depth range. To mitigate this trade-off, we have simultaneously achieved both speed breakthrough and depth range enhancement by improving both the optical projection system and binary coding algorithm based on an off-the-shelf projector. Specifically, we propose a multifocal projection system and oblique projection method, which essentially eliminates the existence of a single focal plane in the conventional axisymmetric system and utilizes its anisotropy characteristics to achieve a superior filtering effect. Furthermore, the optimal pulse width modulation technique is introduced to modulate the square binary pattern for eliminating specific harmonics. To the best of our knowledge, the proposed method, for the first time, simultaneously achieved superfast (9524 frames per second) and large-depth-range (560 mm, about three times that of the conventional method) sinusoidal fringe generation with consistently high accuracy. Experimental results demonstrate the superior performance of the proposed method in multi-dimensional information sensing such as 3D, 4D, and [x, y, z, t; s (strain)].

Quantum teleportation is a key primitive across a number of quantum information tasks and represents a fundamental ingredient for many quantum technologies. Channel capacity, other than the fidelity, becomes another focus of quantum communication. Here, we present a 5-channel multiplexing continuous-variable quantum teleportation protocol in the optical frequency comb system, exploiting five-order entangled sideband modes. Because of the resonant electro-optical modulation (EOM) that is specifically designed, the fidelities of five channels are greater than 0.78, which are superior to the no-cloning limit of 2/3. This work provides a feasible scheme for implementing efficient quantum information processing.

针对大型激光装置使用纹影法无法实现旁瓣光束弱信号区域光强分布精确测量的问题，提出了基于旁瓣光束衍射反演的纹影法强激光远场焦斑测量方法。采用逆向推演间接测量的研究方法，沿光路传播逆方向推导，以旁瓣光束衍射光强图像和相位图像作为输入，通过计算获得未遮挡前旁瓣光束远场焦斑分布。相比传统基于纹影的远场焦斑测量方法，本文的主要改进和优化措施为：首先，基于旁瓣光束衍射反演的原理和间接测量的思想，改进纹影法强激光远场焦斑测量数学模型，从理论角度揭示该模型的合理性；其次，实验仿真强激光远场焦斑测量的整个过程，主要步骤为旁瓣光束衍射、加噪去噪、旁瓣光束衍射反演、焦斑重构等，验证了该方法的可行性；最后，将改进的DnCNN算法用于去除主瓣和旁瓣光束12位科学CCD图像不同级别（0~75 dB）的噪声，提升了远场焦斑的重构精度。实验结果表明：该方法不仅消除了纹影小球对旁瓣光束衍射的影响，而且获得了真实的旁瓣光束弱信号区域的光强分布，包括旁瓣光束各个波峰的幅值和位置、动态范围比值等远场焦斑测量重要参数，其中重构焦斑动态范围比值与理论焦斑动态范围比值之间的误差为3.20%，提高了基于纹影的强激光远场焦斑测量的可信度和实验精度。

随着海洋经济的发展及海洋探索的不断深入，对于高精度、高实效性水下探测手段的需求迫切。高光谱成像探测技术作为将光谱技术及成像技术结合的探测手段，能够在一定程度上填补水下高精度探测的缺口，因此各国研究者逐步开展了水下高光谱成像探测技术的研究。本文介绍了水下高光谱成像技术的发展背景，对不同光谱成像技术方案及水下光谱成像探测系统组成进行了综述，在此基础上概述了目前国内外水下光谱成像探测研究进展，指出了目前水下光谱成像探测技术发展面临的问题和挑战，并对未来水下光谱成像探测技术发展进行了展望。

传统激光雷达探测灵敏度不断提高，但仍然受激光光源的量子噪声以及探测端引入的额外噪声等因素限制。为了进一步提高激光雷达的探测性能，提出利用量子压缩态光场作为激光雷达的本振信号提高激光雷达探测精度的新方案，分析了所提出方案提高激光雷达探测精度的关键因素。制备了集成化低噪声压缩态光场并进行了激光雷达多普勒信息测量实验。实验结果表明，相较于传统相干多普勒激光雷达探测方案，所提方案实现了多普勒信息探测灵敏度3 dB的提升，为量子激光雷达中多普勒信息等微弱信号的探测提供研究途径。

Our previous work had proved pump field noise coupling in the seed field injected optical parametric amplifier (OPA) at a certain analysis frequency. Inspired by this noise coupling mechanism, the frequency dependent squeezing factor due to excess pump noise was experimentally demonstrated. Apart from a reduced squeezing level with an increased noise, the results also prove that a broadband squeezing noise spectrum is not frequency dependent on the amplitude modulated pump field, but limited by the bandwidth of the amplitude modulator and OPA resonator, and the effective measurement is carried out in the frequency range of 2–10 MHz. It provides a guidance to design a broader-bandwidth, higher-level bright squeezed light.