Explanipedia

Large-area specular highlight removal based on disparity layering and multi-strategy hierarchical restoration with light field camera arrays Open

Wei Feng, Jiangtao Xu, Hanzhong Wu, Yuchu Qin, Yongjia Xu , et al. · 2025

In this paper, what we believe to be a new highlight removal method based on disparity layering and multi-strategy hierarchical restoration is proposed to address the challenge of large-area specular highlights by using a light field camer…

Serrodyne‐Enabled Dual Electro‐Optic Comb Interferometry for High‐Precision Absolute Ranging and Integration‐Ready Metrology (Adv. Sci. 37/2025) Open

Xiaoyang Guo, Xie Yang, Jiawen Zhi, Cheng-Gang Shao, Hanzhong Wu · 2025

Serrodyne‐Enabled Dual Electro‐Optic Comb Interferometry for High‐Precision Absolute Ranging and Integration‐Ready Metrology Open

Xiaoyang Guo, Xie Yang, Jiawen Zhi, Cheng-Gang Shao, Hanzhong Wu · 2025

Optical frequency combs (OFCs) have revolutionized precision metrology, enabling highly precise frequency and distance measurements. Dual electro‐optic frequency comb ranging systems traditionally rely on acousto‐optic modulators (AOMs) to…

Ultrafast and precise distance measurement via real-time chirped pulse interferometry Open

Jiawen Zhi, Mingyang Xu, Yang Liu, Mengyu Wang, Cheng-Gang Shao , et al. · 2025

Rapid and precise distance measurement with hybrid comb lasers Open

Zhichuang Wang, Jiawen Zhi, Hanzhong Wu, Brent E. Little, Sai T. Chu , et al. · 2024

Dual-comb ranging allows rapid and precise distance measurement and can be universally implemented on different comb platforms, e.g., fiber combs and microcombs. To date, dual-fiber-comb ranging has become a mature and powerful tool for me…

Absolute Ranging with Time Delay Interferometry for Space-Borne Gravitational Wave Detection Open

Dan Luo, Mingyang Xu, Panpan Wang, Hanzhong Wu, Cheng-Gang Shao · 2024

In future space-borne gravitational wave (GW) detectors, time delay interferometry (TDI) will be utilized to reduce the overwhelming noise, including the laser frequency noise and the clock noise etc., by time shifting and recombining the …

Ultrafast and precise distance measurement via real-time chirped pulse interferometry Open

Mingyang Xu, Hanzhong Wu, Jiawen Zhi, Yang Liu, Jie Zhang , et al. · 2024

Laser frequency combs, which are composed of a series of equally-spaced coherent frequency components, have triggered revolutionary progress for precision spectroscopy and optical metrology. Length/distance is of fundamental importance in …

Time delay interferometry combination with zero-response Open

Pan-Pan Wang, Xiao-Yu Lu, Xinlei Zhao, H. Chen, Jing Zhou , et al. · 2024

In space-based gravitational wave detection, gravitational wave signals are detected by measuring the Doppler frequency shift of laser exchange between three satellites. Although the laser is pre-stabilized, the laser phase noise is signif…

Influence of EOM sideband modulation noise on space-borne gravitational wave detection Open

Mingyang Xu, Yu-Jie Tan, Hanzhong Wu, Panpan Wang, Hao Yan , et al. · 2024

Clock noise is one of the dominant noises in the space-borne gravitational wave (GW) detection. To suppress this noise, the clock noise-calibrated time-delay-interferometry (TDI) technique is proposed. In this technique, an inter-spacecraf…

Experimental demonstration of sub-100 picometer level signal extraction with time-delay interferometry technique Open

Mingyang Xu, Yu-Jie Tan, Yurong Liang, Jiawen Zhi, Xiaoyang Guo , et al. · 2023

In this work, we have built an experimental setup to simulate the clock noise transmission between two spacecrafts, and further demonstrated the extraction of picometer level signal drowned by the large laser frequency noise and clock nois…

Experimental demonstration of picometer level signal extraction with time-delay interferometry technique Open

Mingyang Xu, Yu-Jie Tan, Yurong Liang, Xiaoyang Guo, Dan Luo , et al. · 2023

In this work, we have built an experimental setup to simulate the clock noise transmission with two spacecrafts and two optical links, and further demonstrated the extraction of picometer level signal drowned by the large laser frequency n…

Influence of EOM sideband modulation noise on space-borne gravitational wave detection Open

Mingyang Xu, Yu-Jie Tan, Hanzhong Wu, Panpan Wang, Hao Yan , et al. · 2023

Clock noise is one of the dominant noises in the space-borne gravitational wave (GW) detection. To suppress this noise, the clock noise-calibrated time-delay-interferometry (TDI) technique is proposed. In this technique, an inter-spacecraf…

Arm locking in conjunction with time-delay interferometry Open

Panpan Wang, Wei‐Liang Qian, Hanzhong Wu, Yu-Jie Tan, Cheng-Gang Shao · 2022

A crucial challenge to the ongoing endeavor of spaceborne gravitational wave (GW) detection resides in the laser phase noise, typically 7 to 8 orders of magnitude above the inevitable noise. The arm locking technique was proposed to suppre…

Weak-Light Phase-Locking Time Delay Interferometry with Optical Frequency Combs Open

Mingyang Xu, Hanzhong Wu, Yurong Liang, Dan Luo, Panpan Wang , et al. · 2022

In the future space-borne gravitational wave (GW) detector, the optical transponder scheme, i.e., the phase-locking scheme, will be utilized so as to maintain the signal-to-noise ratio (SNR). In this case, the whole constellation will shar…

Geometric approach for the modified second generation time delay interferometry Open

Pan-Pan Wang, Wei‐Liang Qian, Yu-Jie Tan, Hanzhong Wu, Cheng-Gang Shao · 2022

The time delay interferometry (TDI) is an algorithm proposed to suppress the\nlaser frequency noise in space-borne gravitational wave detectors. As a\npost-processing technique, it is implemented by constructing a virtual equal\narm interf…

Arm locking using laser frequency comb Open

Hanzhong Wu, Jun Ke, Panpan Wang, Yu-Jie Tan, Dianhong Wang , et al. · 2022

The space-borne gravitational wave (GW) detectors, e.g., LISA, TaiJi, and TianQin, will open the window in the low-frequency regime (0.1 mHz to 1 Hz) to study the highly energetic cosmic events, such as coalescences and mergers of binary b…

Rapid absolute distance measurement by dynamic chirped pulse interferometry Open

Xinyang Xu, Haihan Zhao, Zhiwen Qian, Chao Liu, Jingsheng Zhai , et al. · 2021

Frequency combs have given rise to revolutionary progress in a variety of applications. The absolute distance measurement by using frequency comb has been developing rapidly in recent years. In this paper, a method of rapid ranging via the…

Three-Dimensional Imaging by Frequency-Comb Spectral Interferometry Open

Haihan Zhao, Zi-qiang Zhang, Xinyang Xu, Haoyun Zhang, Jingsheng Zhai , et al. · 2020

In this paper, we demonstrate a three-dimensional imaging system based on the laser frequency comb. We develop a compact, all-fiber mode-locked laser at 1 μm, whose repetition frequency can be tightly synchronized to the external frequency…

Long distance measurement by dynamic optical frequency comb Open

Xinyang Xu, Zi-qiang Zhang, Haoyun Zhang, Haihan Zhao, Wenze Xia , et al. · 2020

In this paper, we propose a method aiming to measure the absolute distance via the slope of the inter-mode beat phase by sweeping the repetition frequency of the frequency comb. The presented approach breaks the inertial thinking of the ex…

A High-Resolution Ultrasonic Ranging System Using Laser Sensing and a Cross-Correlation Method Open

Lecheng Jia, Bin Xue, Shili Chen, Hanzhong Wu, Xiaoxia Yang , et al. · 2019

Ultrasound has been proven to be a valid tool for ranging, especially in water. In this paper, we design a high-resolution ultrasonic ranging system that uses a thin laser beam as an ultrasonic sensor. The laser sensing provides a nonconta…

Underwater distance measurement using frequency comb laser Open

Xiaoyu Zhai, Zhaopeng Meng, Haoyun Zhang, Xinyang Xu, Zhiwen Qian , et al. · 2019

In this paper, we theoretically and experimentally analyze the frequency-comb interferometry at 518 nm in the underwater environment, which we use to measure the underwater distance with high accuracy and precision. In the time domain, we …

Focusing of scattering light by combining polarization phase shifting and digital optical phase conjugation Open

Kai Zhang, Bin Xue, Zhiyang Wang, Hanzhong Wu · 2019

散射介质对光的随机散射作用是制约其光学聚焦和成像的重要因素，光学相位共轭技术能够通过对散射光场共轭还原实现透过散射介质的光学聚焦和成像，其中散射光场相位的获取是共轭还原的核心。阐述了偏振相移的基本原理，将偏振相移与相位共轭技术相结合，设计了新的基于偏振相移的数字光学相位共轭系统。采用633 nm的HeNe激光器作为系统光源，毛玻璃作为散射介质开展散射光聚焦实验研究。实验结果表明：该装置能够成功实现透过散射介质的光学聚焦，其中聚焦点与背景光强的比值可达约400倍。

Direct measurement of the sound velocity in seawater based on the pulsed acousto-optic effect between the frequency comb and the ultrasonic pulse Open

Bin Xue, Zhiyang Wang, Kai Zhang, Haoyun Zhang, Yang Chen , et al. · 2018

We present a new method to measure the velocity of sound in pure water and seawater using the Raman-Nath diffraction caused by acousto-optic effect between the optical frequency comb and the ultrasonic pulse. In the Mach-Zehnder interferom…

Absolute Measurement of the Refractive Index of Water by a Mode-Locked Laser at 518 nm Open

Zhaopeng Meng, Xiaoyu Zhai, Jianguo Wei, Zhiyang Wang, Hanzhong Wu · 2018

In this paper, we demonstrate a method using a frequency comb, which can precisely measure the refractive index of water. We have developed a simple system, in which a Michelson interferometer is placed into a quartz-glass container with a…

Absolute distance measurement with correction of air refractive index by using two-color dispersive interferometry Open

Hanzhong Wu, Fumin Zhang, Tingyang Liu, Jianshuang Li, Xinghua Qu · 2016

Two-color interferometry is powerful for the correction of the air refractive index especially in the turbulent air over long distance, since the empirical equations could introduce considerable measurement uncertainty if the environmental…

Absolute distance ranging by means of chirped pulse interferometry Open

Tingyang Liu, Fumin Zhang, Hanzhong Wu, Li Jian-Shuang, Shi Yong-Qiang , et al. · 2016

Large-range and high-accuracy absolute distance measurement plays an important role in many practical applications, such as industrial production, aerospace and scientific research, etc. In this paper, a method is proposed for absolute dis…

Absolute distance measurement by chirped pulse interferometry using a femtosecond pulse laser Open

Hanzhong Wu, Fumin Zhang, Tingyang Liu, Fei Meng, Jianshuang Li , et al. · 2015

We propose here a method for absolute distance measurement by chirped pulse interferometry using frequency comb. The principle is introduced, and the distance can be measured via the shift of the widest fringe. The experimental results sho…

Absolute distance measurement in a combined-dispersive interferometer using a femtosecond pulse laser Open

Hanzhong Wu, Fumin Zhang, Fei Meng, Tingyang Liu, Jianshuang Li , et al. · 2015

In this paper, a ranging system using dispersive interferometry is developed with a femtosecond pulse laser, aiming to eliminate the measurement dead zones by using a greatly unbalanced Mach–Zehnder interferometer. The distance can be meas…

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