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 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
1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
3 e-mail: zhhli@lps.ecnu.edu.cn
We report a frequency-multiplexing method for multi-beam photon-counting light detection and ranging (LiDAR), where only one single-pixel single-photon detector is employed to simultaneously detect the multi-beam echoes. In this frequency-multiplexing multi-beam LiDAR, each beam is from an independent laser source with different repetition rates and independent phases. As a result, the photon counts from different beams could be discriminated from each other due to the strong correlation between the laser pulses and their respective echo photons. A 16-beam LiDAR system was demonstrated in three-dimensional laser imaging with 16 pulsed laser diodes at 850 nm and one single-photon detector based on a Si-avalanche photodiode. This frequency-multiplexing method can greatly reduce the number of single-photon detectors in multi-beam LiDAR systems, which may be useful for low-cost and eye-safe LiDAR applications.
Photonics Research
2019, 7(12): 12001381