Explanipedia

First GNSS-deployed optical clock for local time scale upgrade Open

Yang Yuan, Jian Cao, Jinbo Yuan, Dehao Wang, Pengfei Fang , et al. · 2025

Precise time scale is the universal base for all measurements. Here we report the deployment of a compact and transportable optical clock to a timekeeping institution and steering an active hydrogen maser to generate an optical time scale,…

Generation of sub-three-cycle pulses via double-stage all-fiber nonlinear compression from a thulium-doped fiber laser Open

Yan Wu, Yu Cai, Guoqing Zhou, Jintao Fan, Youjian Song , et al. · 2025

The research of 369.5 nm laser stabilizing method and its influence on ytterbium ion optical clock Open

Shaoyang Dai, Chaowei Wang, Shiying Cao, Yani Zuo, Kun Liu , et al. · 2025

The 369.5 nm laser serves as the cooling laser for ytterbium-ion optical clocks, and its frequency instability directly affects the intensity of ion fluorescence. This paper compares two stabilization methods for a 369.5 nm frequency-tripl…

Fiber Sensor for Liquid Level Detection Based on Micro‐Arc Air Cavity Structure Open

Shiying Cao, Beibei Mao, Weihao Cheng, Mingzhu Yang, Jingfei Ye , et al. · 2025

A novel liquid level sensor is devised, leveraging the principle of Fabry‐Perot interferometry (FPI). The sensor amalgamates micro‐arc and air cavity structures. The micro‐arc is fabricated through flame pyrolysis, while the air cavity is …

Dual-frequency optical-microwave atomic clocks based on cesium atoms Open

Tiantian Shi, Qiang Wei, Xiaomin Qin, Zhongfan Liu, Kunkun Chen , et al. · 2024

$^{133}$Cs, which is the only stable cesium (Cs) isotope, is one of the most investigated elements in atomic spectroscopy and was used to realize the atomic clock in 1955. Among all atomic clocks, the cesium atomic clock has a special plac…

Realization of frequency calibration for 532 nm wavelength laser based on spectral enhancement technology Open

Han-Yu Zhao, Shiying Cao, Shaoyang Dai, Tao Yang, Yani Zuo , et al. · 2024

The iodine frequency stabilized 532 nm Nd:YAG laser plays an important role in realizing the reproduction unit of length “meter (m)”, absolute gravity measurement, gravitational waves detection, precision spectroscopy, distance metrology, …

Absolute frequency measurements with a robust, transportable <sup>40</sup>Ca<sup>+</sup> optical clock Open

Huaqing Zhang, Yao Huang, Baolin Zhang, Yanmei Hao, Mengyan Zeng , et al. · 2023

We constructed a transportable 40 Ca + optical clock (with an estimated minimum systematic shift uncertainty of and a stability of ) that can operate outside the laboratory. We transported it from the Innovation Aca…

Absolute frequency measurements with a robust, transportable ^{40}Ca^{+} optical clock Open

Huaqing Zhang, Yao Huang, Baolin Zhang, Yanmei Hao, Mengyan Zeng , et al. · 2023

We constructed a transportable 40Ca+ optical clock (with an estimated minimum systematic shift uncertainty of 1.3*10^(-17) and a stability of 5*10^(-15)/sqrt{tau} ) that can operate outside the laboratory. We transported it from the Innova…

Development and Evaluation of a Narrow Linewidth Laser System for 171Yb+ E2 Transition Open

Yani Zuo, Shiying Cao, Shaoyang Dai, Yige Lin, Tao Yang , et al. · 2023

We report the construction and characterization of a narrow-linewidth laser system to interrogate the E2 clock transitions at 436 nm of ytterbium ions trapped in end-cap traps. The 871 nm seed laser at the fundamental frequency is referenc…

Influence of the Interferometric Spectral Bandwidth on the Precision of Large-Scale Dual-Comb Ranging Open

Zhiqi Xie, Yang Liu, Jianshuang Li, Ruixue Zhang, Mingzhao He , et al. · 2023

Environment-stable sub-100 fs Er: fiber laser with a 3 dB bandwidth of 78 nm Open

Yi Han, Haochen Tian, Fei Meng, Kai Wang, Shiying Cao · 2022

A robust all polarization-maintaining (PM) passively mode-locked Er-doped fiber laser is demonstrated based on the biased nonlinear amplifier loop mirror (NALM). With a π/2 nonreciprocal free-space phase shifter, stable single pulse mode l…

A compact, transportable optical clock with 1×10−17 uncertainty and its absolute frequency measurement Open

Jian Cao, Jinbo Yuan, Shaomao Wang, Ping Zhang, Yi Yuan , et al. · 2022

We report a robust, compact, and transportable optical clock (TOC-729-2) based on a trapped single 40Ca+ ion with a systematic uncertainty of 1.1×10−17, which is limited by the black-body radiation shift uncertainty at room temperature. By…

Narrow-Linewidth Frequency Transfer from 698 Nm to 1542 Nm Based on Er-Doped Fiber Optical Frequency Comb Open

Shiying Cao, Baike Lin, Yi Han, Zhanjun Fang · 2022

Low-noise microwave generation based on optical-microwave synchronization Open

Kai Wang, Baike Lin, Youjian Song, Fei Meng, Yige Lin , et al. · 2022

Low-noise microwave signals are of vital importance in fields such as cold atomic optical clocks, photon radars, and remote synchronization at large facilities. Here, we report a compact all-optical-fiber method to generate a low noise mic…

Method of adjusting carrier-envelope offset frequency based on electro-optic-crystal Mach-Zehnder interferometer Open

Yong-Jin Ding, Shiying Cao, Bai-Ke Lin, Qiang Wang, Yi Han , et al. · 2022

Electro-optic-modulator (EOM) based Mach-Zehnder (M-Z) interferometer is a novel method of controlling the carrier envelope offset frequency (f₀). It is achieved by adjusting the envelop of the pulse, while keeping the ca…

Fiber-delay-line-referenced optical frequency combs: three stabilization schemes Open

Kai Wang, Haochen Tian, Fei Meng, Baike Lin, Shiying Cao , et al. · 2021

We demonstrate the stabilization of an optical frequency comb (OFC) using a segment of fiber delay line as a reference. A mode-locked Er-doped fiber laser is phase locked to a kilometer-long fiber delay line using three different schemes. …

Numerical analyses of key parameters of nonlinear asynchronous optical sampling using dual-comb system Open

Wenze Xia, Yang Liu, Mingzhao He, Shiying Cao, Weilei Yang , et al. · 2021

Absolute distance measurement based on the asynchronous optical sampling with using a dual-comb system has the characteristics of large range, fast measurement speed, and high accuracy, which has wide application prospects in the field of …

Influence of electro-optic modulator on Er-doped fiber femtosecond laser Open

Shiying Cao, Bai-Ke Lin, Xiao-Di Yuan, Yong-Jin Ding, Fei Meng , et al. · 2020

Narrow-linewidth femtosecond optical frequency comb plays an important role in the fields, such as optical clock comparison, time frequency transfer, ultrastable microwave generation, absolute distance measurement, high precision spectrosc…

Narrow-linewidth optical frequency comb reference to a fiber delay line Open

Haochen Tian, Fei Meng, Baike Lin, Shiying Cao, Zhanjun Fang , et al. · 2020

In this letter, we derive a fully-stabilized narrow-linewidth optical frequency comb (OFC) reference to a kilometer-long fiber delay line for the first time, to the best of our knowledge. The 1537-nm comb modes and 1566-nm comb modes in th…

The optically generated microwave oscillator with long-term stability locked at hydrogen maser Open

Shaoyang Dai, Fang Fang, Kun Liu, Weiliang Chen, Nianfeng Liu , et al. · 2020

We present an oscillator of optically generated microwaves (OGMs) based on an optical frequency comb (OFC) and an ultrastable laser (USL). The USL provides short-term stability, and the OFC transfers the short-term stability to radio frequ…

Saturable absorber based on a single mode fiber – graded index fiber – single mode fiber structure with inner micro-cavity Open

Fan Yang, D. N. Wang, Zhaokun Wang, Liujiang Li, Chunliu Zhao , et al. · 2018

An Er-doped mode-locked fiber laser with a saturable absorber based on single mode - graded index multimode - single mode fiber (SMF-GIMF-SMF) with inner micro-cavity is demonstrated. The modulation depth of the saturable absorber was meas…

Dual-Comb Absolute Distance Measurement Based on a Dual-Wavelength Passively Mode-Locked Laser Open

Baike Lin, Xin Zhao, Mingzhao He, Yingling Pan, Jie Chen , et al. · 2017

A new absolute distance measurement system is demonstrated in this paper, which is based on a dual-wavelength passive mode-locked fiber laser. By controlling the intracavity loss and spectral filtering, the cavity mode-locked by a single-w…

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