华东师范大学精密光谱科学与技术国家重点实验室，上海 200241
单光子探测技术具有高灵敏度、低时间抖动、低功耗等独特优势，在激光测距和成像中的应用越来越广泛。基于此，提出一种低成本的高精度单光子测距技术。利用窄脉冲电路驱动激光二极管产生脉宽为160 ps的窄脉冲激光，利用多像素光子计数器研制时间抖动为417 ps的低时间抖动单光子探测器，降低系统的整体时间抖动，并搭建高精度单光子测距实验装置。测距实验结果表明，在2 m的测距量程内，单光子测距系统的距离测量精度可达370 μm@RMS。实验装置采用同轴光路设计，结构简单，易于集成，为实现小型化低功耗高精度单光子测距系统提供了一种可行性的解决方案。
激光测距 单光子探测器 亚毫米 光子计数 激光与光电子学进展
2024, 61(5): 0512007
精密光谱科学与技术国家重点实验室 华东师范大学 上海 200241
光功率的测量是光学研究领域最重要、最常用的计量技术之一, 尤其在光通信、激光测绘等领域, 同时具有优于皮瓦量级灵敏度和大动态范围的光功率测量是用于系统测试和标定的极为关键的技术, 然而目前商售的光功率计测量灵敏度通常仅能达到纳瓦量级。本文发展了一种极限灵敏度可达稀疏光子水平的光功率测量装置, 测量系统采用硅雪崩光电二极管单光子探测器, 使用散射片和电控光阑精密控制待测信号光强度, 实现了在20fW～300W范围内的光功率测量, 功率测量的响应波长范围可以覆盖530～860nm, 测量误差小于3.7%, 重复性测量相对标准偏差小于1.9%, 能够满足微弱信号光功率测量需求。这种兼具高灵敏度和大动态范围的光功率测量方法有望解决强度微弱至稀疏光子水平的光信号计量难题。
光功率测量 稀疏光子 单光子探测 雪崩光电二极管 optical power measurement sparse photon large dynamic range avalanche photodiode 量子光学学报
2023, 29(3): 030201
Author Affiliations
Abstract
1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
2 Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing 401120, China
3 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
A multi-channel laser interferometer (MCLI) is proposed to improve the coordinate measurement accuracy. A 780 nm external cavity laser is locked on the D2 line of 87Rb atom by polarization spectroscopy, and a high frequency stabilized laser source is obtained with a linewidth of 385.8 kHz at root mean square (RMS). The interferometers share the stabilized source and individually install on 4 axes of a coordinate measuring system. As a result, the measurement uncertainty is reduced from 1.2 μm to 0.2 μm within the dynamic measurement range of 1.0 m. The MCLI is adept at integrate and flexible installation, which caters to various applications on precision measurement.
光电子快报（英文版）
2022, 18(10): 588
Author Affiliations
Abstract
1 State Key Laboratory of Precision Spectroscopy (East China Normal University), Shanghai 200241, China
2 Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing 401120, China
3 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
We demonstrate a portable system integrated with time comparison, absolute distance ranging, and optical communication (TRC) to meet the requirements of space gravitational wave detection. A 1 km free-space asynchronous two-way optical link is performed. The TRC realizes optical communication with bit error rate with a Si avalanche photodiode single-photon detector, while the signal intensity is 1.4 photons per pulse with the background noise of counts per second. The distance measurement uncertainty is 48.3 mm, and time comparison precision is 162.4 ps. In this TRC system, a vertical-cavity surface-emitting laser diode with a power of 9.1 µW is used, and the equivalent receiving aperture is 0.5 mm. The TRC provides a miniaturization solution for ultra-long distance inter-satellite communication, time comparison, and ranging for space gravitational wave detectors.
gravitational waves detection time comparison optical communication ranging Chinese Optics Letters
2022, 20(10): 100601
华东师范大学精密光谱科学与技术国家重点实验室，上海 200241
多波束单光子雷达在对地测绘和远距离成像等领域具有重要应用，而多通道计时测量技术很大程度上决定了整个系统的性能。因此，提出了一种基于时钟相移法的多通道时间数字转换并行测量方法。该方法可在单块Xilinx Artix-7系列现场可编程门阵列芯片上实现了100通道单光子信号的同时计时测量，计时分辨率可达到1.0 ns，测量精度为360 ps，量程为65 μs。基于该装置可实现稳定性高、功耗小、速度快、结构紧凑的多通道单光子回波信号的高精度测量，满足多波束单光子雷达系统的计时需求。
探测器 单光子雷达 时钟相移法 现场可编程门阵列 计时测量 激光与光电子学进展
2022, 59(2): 0204001
Author Affiliations
Abstract
1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
We demonstrate a multi-channel pseudo-random coding single-photon ranging system. A pseudo-random multiplexing technique is proposed, which realizes multi-channel pseudo-random ranging only by using one single-photon detector and processing circuit. Compared with the time division multiplexing technique, it will not reduce the maximum unambiguous range while increasing the number of the ranging channel. Eight-channel pseudo-random coding single-photon ranging was realized with the ranging accuracy better than 2 cm. Moreover, photon counting imaging was realized through scanning the laser beams of the eight-channel pseudo-random ranging system. There is no crosstalk between channels, which is suitable for multi-beam long-distance single-photon Lidar.
single-photon detection pseudo-random modulation laser ranging Chinese Optics Letters
2022, 20(2): 021202
Author Affiliations
Abstract
1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
2 AECC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, China
In order to implement 3D point cloud scanning of small hole structure, which could not be contacted or damaged, we propose a noncontact 3D measuring method. The system contains a laser triangulation displacement sensor, a Michelson interferometer system and a coordinate measuring machine, with the advantages of non-invasive scanning, fast measurement speed and high precision. Focusing on reconstructing 3D point cloud data, random sample consensus is used to separate surface data and hole data respectively from the raw dataset. Least square optimization determines the function of the cylinder, as well as hole diameter and inclined angle between the hole and the surface. In the experiment scanning a round hole, the estimated result has diameter error and angle error within 30 μm and 0.2°, respectively. Results manifest the effectiveness and feasibility of this system and express practicality in manufacturing industry.
光电子快报（英文版）
2021, 17(4): 231
湖南农业大学食品科学技术学院, 长沙 410128
乳酸菌属于肠道内的有益菌, 对调节人体健康有益, 其生长能力和活性受外界条件的影响。促生长因子是一类对微生物生长繁殖具有促进作用的物质, 可用于有效提高乳酸菌数量和活性。围绕乳酸菌促生长因子与益生元的关系及其来源、类别和作用机理等方面, 综述其在乳酸菌上的研究与应用, 并对未来发展方向进行了展望, 以期为促生长因子在乳酸菌产业中的应用提供参考。
乳酸菌 促生长因子 益生元 作用机制 lactic acid bacteria growth promoting factor prebiotics mechanism
华东师范大学精密光谱科学与技术国家重点实验室, 上海 200062
介绍一种日盲紫外单光子成像系统。系统采用Geiger模式的硅基雪崩光电二极管(Si APD)的单光子探测器,结合时间相关单光子符合计数技术,实现了0~400 m距离的激光三维成像,成像精度达到22 mm。实验采用266 nm波长激光脉冲(处于日盲紫外波段),由于大气层的吸收作用,在地表几乎不存在该波段的噪声,大幅提高了单光子成像系统的抗背景光噪声的能力。该成像系统可在晴朗的白天运行,实现了全天时中远距离单光子成像。
成像系统 日盲紫外 光子计数 三维成像 激光雷达 激光与光电子学进展
2021, 58(10): 1011023
Author Affiliations
Abstract
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
We report a method to reduce the detection delay temperature drift for a single-photon detector based on the avalanche photodiode (SPAD). Both the SPAD and the comparator were temperature stabilized, resulting in an ultra-low temperature drift at 0.01 ps/°C. A stable time deviation as 0.15 ps over 1000 s was realized, while the ambient temperature fluctuated rapidly from 24°C to 44°C. To the best of our knowledge, this is the first report on the ultra-stable delay SPAD detector in the case of rapid increase or decrease of ambient temperature. It is helpful to improve the stability of onboard detectors for optical laser time transfer between ground and space.
avalanche photodiodes laser ranging single-photon detection stability temperature dependence Chinese Optics Letters
2021, 19(8): 082502
