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European Frequency and Time Forum (EFTF)

作者： Jingming Chen Jie Miao Qiaohui Yang Tianyu Liu Zhendong Chen Duo Pan Jiqing Lian Jingbiao Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou China School of Mechano-Electronic Engineering Xidian University Xi'an China Hefei National Laboratory Hefei China

ISBN: (数字)9798350354270

ISBN: (纸本)9798350354287

In this paper, we investigate the modulation transfer spectroscopy (MTS) of 87Rb D1 line under noncycling transitions. The line shape of the MTS signal was determined, and the system's long-term stability was measured. Results showed that the system consistently performed at a short-term and long-term stability of E-14 level estimated from the residual error signal, indicating high performance of the compact optical frequency standard.

关键词： Laser theory Time-frequency analysis Spectroscopy Shape Atomic beams Shape measurement Laser stability Adaptive optics Standards Physics

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Multi-frequency terahertz Smith-Purcell radiation via momentum-mismatch-driven quasi-bound states in the continuum

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Photonics Research 2025年第3期13卷 593-603页

作者： ZI-WEN ZHANG JUAN-FENG ZHU FENG-YUAN HAN XIAO LIN CHAO-HAI DU Center for Carbon-based Electronics School of ElectronicsPeking UniversityBeijing 100871China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China Science Mathematicsand Technology(SMT)Singapore University of Technology and DesignSingapore 487372Singapore Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterCollege of Information Science&Electronic EngineeringZhejiang UniversityHangzhou 310027China International Joint Innovation Center The Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China

Bound states in the continuum(BICs)have gained considerable attention for their ability to strengthen light-matter interactions,enabling applications in lasing,sensing,and *** properties also show great promise for intensifying free-electron ***,researchers realized momentum-mismatch-driven quasi-BICs in compound grating *** category of quasi-BICs exhibits high Q factors over a broad frequency *** this paper,we explore the possibility of achieving multi-frequency terahertz Smith-Purcell radiation empowered by momentum-mismatch-driven quasi-BICs in silicon compound grating *** leveraging the low-loss properties of silicon in the terahertz range,quasi-BICs are achieved through guided-mode resonance,delivering exceptionally high Q factors over a broad frequency *** broadband nature of these quasi-BICs enables efficient energy extraction from electron beams across varying voltages,while their multimode characteristics support simultaneous interactions with multiple modes,further boosting radiation *** findings demonstrate significant enhancement of free-electron radiation at multiple frequencies,addressing the limitations of narrowband methods and high-loss metallic *** integrating broadband performance with the advantages of low-loss dielectric platforms,this work advances the development of compact,tunable terahertz free-electron radiation sources and provides valuable insights into optimizing quasi-BIC systems for practical applications.

关键词： multi frequency momentum mismatch compound grating waveguides terahertz smith purcell radiation compound grating waveguidesthis bound states continuum bics silicon

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Influence of thermal effects on atomic Bloch oscillation

arXiv

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arXiv 2024年

作者： Yin, Guoling Lai, Chi-Kin Chang, Nana Liang, Yi Mao, Dekai Zhou, Xiaoji State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University Taiyuan030006 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China Institute of Carbon-based Thin Film Electronics Peking University Taiyuan Shanxi030012 China

Advancements in the experimental toolbox of cold atoms have enabled the meticulous control of atomic Bloch oscillation within optical lattices, thereby enhancing the capabilities of gravity interferometers. This work delves into the impact of thermal effects on Bloch oscillation in 1D accelerated optical lattices aligned with gravity by varying the system’s initial temperature. Through the application of Raman cooling, we effectively reduce the longitudinal thermal effect, stabilizing the longitudinal coherence length over the timescale of its lifetime. The atomic losses over multiple Bloch oscillation is measured, which are primarily attributed to transverse excitation. Furthermore, we identify two distinct inverse scaling behaviors in the oscillation lifetime scaled by the corresponding density with respect to temperatures, implying diverse equilibrium processes within or outside the Bose-Einstein condensate regime. The competition between the system’s coherence and atomic density leads to a relatively smooth variation in the actual lifetime versus temperature. Our findings provide valuable insights into the interaction between thermal effects and Bloch oscillation, offering avenues for the refinement of quantum measurement technologies. © 2024, CC BY.

关键词： optical lattices

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Quantum noise of dark pulse microcombs

Quantum noise of dark pulse microcombs

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CLEO: QELS_Fundamental Science, QELS 2022

作者： Lao, Chenghao Jin, Xing Chang, Lin Xie, Weiqiang Shu, Haowen Wang, Xingjun Bowers, John E. Yang, Qi-Fan State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Frontiers Science Center for Nano-Optoelectronics School of Physics Peking University Beijing100871 China Department of Electrical and Computer Engineering University of California Santa BarbaraCA93106 United States State Key Laboratory of Advanced Optical Communications System and Networks Department of Electronics School of Electronics Engineering and Computer Science Peking University Beijing100871 China

We investigate the fundamental timing jitter of dark pulse microcombs generated in an AlGaAs microresonator, where the quantum-limited frequency noise of the 91-GHz repetition rate is measured to be 0.5 Hz2/Hz. ©... 详细信息

ISBN: (纸本)9781557528209

关键词： Aluminum gallium arsenide

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The influence of proton radiation on the performance of silicon Mach-Zehnder modulator

The influence of proton radiation on the performance of sili...

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2021 Asia communications and Photonics Conference, ACP 2021

作者： Han, Changhao Hu, Zhaoyi Tao, Yuansheng Fu, Engang Wang, Xingjun State Key Laboratory of Advanced Optical Communications System and Networks Department of Electronics School of Electronics Engineering and Computer Science Peking University Beijing100871 China State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China

The influence of proton radiation on silicon Mach-Zehnder modulator performance was studied for space environment. The modulator was sensitive to proton radiation while still demonstrated a certain working ability aft... 详细信息

ISBN: (纸本)9781957171005

关键词： Silicon

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Velocity-comb modulation transfer spectroscopy

arXiv

引用

arXiv 2025年

作者： Guan, Xiaolei Xiao, Zheng Liu, Zijie Wang, Zhiyang Zhang, Jia Gao, Xun Chang, Pengyuan Shi, Tiantian Chen, Jingbiao State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum Electronics School of Electronics Peking University Beijing100871 China Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing210003 China National Key Laboratory of Advanced Micro and Nano Manufacture Technology School of Integrated Circuits Peking University Beijing100871 China Hefei National Laboratory Hefei230088 China

Sub-Doppler laser spectroscopy is a crucial technique for laser frequency stabilization, playing a significant role in atomic physics, precision measurement, and quantum communication. However, recent efforts to improve frequency stability appear to have reached a bottleneck, as they primarily focus on external technical approaches while neglecting the fundamental issue of low atomic utilization ( Copyright © 2025, The Authors. All rights reserved.

关键词： Frequency stability

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Single-shot detection time-stretched interferometer with attosecond precision

Single-shot detection time-stretched interferometer with att...

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optical Fiber communication Conference, OFC 2020

作者： Xian, Tianhao Zhan, Li Zhang, Wenchao Zhang, Wenyan Gao, Lirun State Key Laboratory of Advanced Optical Communication System and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China

A single-shot time-stretched interferometer for femtosecond and picosecond time detection is proposed and demonstrated. The time precision is ~40 attosecond. This technique succeeds in charactering the motion of delay... 详细信息

ISBN: (纸本)9781943580712

关键词： Interferometers

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Sub-harmonic entrainment breather solitons in ultrafast lasers

Sub-harmonic entrainment breather solitons in ultrafast lase...

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2020 Frontiers in Optics Conference, FiO 2020

The breather period of breather soliton generated in mode-locked fiber laser tends to be integral folds of roundtrip time at the vicinity. This novel non-Hermitian degeneracy can enhance the stability of breather soli... 详细信息

ISBN: (纸本)9781943580804

关键词： Solitons

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Single-shot resolving soliton interaction

Single-shot resolving soliton interaction

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Frontiers in Optics + Laser Science 2021, FiO+LS 2021 - Part of Frontiers in Optics, FiO 2021

作者： Xian, Tianhao Wang, Wenchao Wu, Jian Zhan, Li State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China College of Advanced Interdisciplinary Studies National University of Defense Technology Changsha410073 China

The soliton interaction dynamics in harmonic mode-locked laser is experimentally revealed in time and phase domains for the first time. The mismatch evolutions of long-range inter-soliton time separation and relative ...

ISBN: (纸本)9781557528209

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High-Speed 2 $\mu \mathrm{m}$ Silicon Photonic Mach-Zehnder Modulator with 30 GHz Bandwidth

High-Speed 2 $\mu \mathrm{m}$ Silicon Photonic Mach-Zehnder ...

引用

Asia communications and Photonics Conference and Exhibition (ACP)

作者： Jianing Wang Xuelin Zhang Xi Wang Yanfu Yang Jiangbing Du Ke Xu Department of Integrated Circuits Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Harbin Institute of Technology Shenzhen China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China Department of Integrated Circuits Harbin Institute of Technology Shenzhen China

We proposed a high-speed $2-\mu \mathrm{m}$ Mach-Zehnder modulator with a record high bandwidth up to 30 GHz, which is able to modulate high-speed signals up to 34 Gb/s.

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

We proposed a high-speed $2-\mu \mathrm{m}$ Mach-Zehnder modulator with a record high bandwidth up to 30 GHz, which is able to modulate high-speed signals up to 34 Gb/s.

关键词： Mach-Zehnder interferometers Asia Modulation Bandwidth Silicon photonics optical fiber communication system-on-chip Next generation networking Signal to noise ratio

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