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A Yb optical clock with a lattice power enhancement cavity

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Chinese Physics B 2024年第3期33卷 70-74页

作者：王春云姚远师浩森于洪浮马龙生蒋燕义 State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

We construct a power enhancement cavity to form an optical lattice in an ytterbium optical *** is demonstrated that the intra-cavity lattice power can be increased by about 45 times,and the trap depth can be as large as 1400Er when laser light with a power of only 0.6 W incident to the lattice *** high trap depths are the key to accurate evaluation of the lattice-induced light shift with an uncertainty down to~1×*** probing the ytterbium atoms trapped in the power-enhanced optical lattice,we obtain a 4.3 Hz-linewidth Rabi spectrum,which is then used to feedback to the clock laser for the close loop operation of the optical lattice *** evaluate the density shift of the Yb optical lattice clock based on interleaving measurements,which is-0.46(62)*** result is smaller compared to the density shift of our first Yb optical clock without lattice power enhancement cavity mainly due to a larger lattice diameter of 344μm.

关键词： optical atomic clock optical lattice optical cavity Stark shift

面向TDI技术地面验证的激光干涉仪本底噪声分析

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量子电子学报 2024年第4期41卷 649-658页

作者：左凌云师浩森姚远蒋燕义马龙生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

在空间引力波探测中,由于星间激光干涉臂不等,导致激光频率噪声不能共模消除,从而使微弱的引力波信号被激光频率噪声淹没。时间延迟干涉(TDI)技术通过将激光相位数据在时间上延迟,构成虚拟等臂干涉,从而能减小激光频率噪声对引力波信号... 详细信息

在空间引力波探测中,由于星间激光干涉臂不等,导致激光频率噪声不能共模消除,从而使微弱的引力波信号被激光频率噪声淹没。时间延迟干涉(TDI)技术通过将激光相位数据在时间上延迟,构成虚拟等臂干涉,从而能减小激光频率噪声对引力波信号探测的影响。为了在地面验证TDI技术能够将激光频率噪声对引力波探测的影响降低至3×10^(-7) Hz/√Hz(傅里叶频率1 mHz处),需要分析TDI地面验证系统本底噪声的主要来源。通过实验测量和计算分析,提出了面向TDI技术地面验证的激光干涉仪的重要参数设计要求,包括激光干涉臂的臂长差、激光频率稳定度、气压稳定度、激光功率稳定度以及各部件温度稳定度等。

关键词：激光技术空间引力波探测激光干涉仪噪声分析时间延迟干涉激光频率噪声

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魔方型智能仓储系统多AGV任务调度及优化

物流科技 2024年第11期47卷 174-178页

作者：杨春霞陈航慧师浩森太原科技大学车辆与交通工程学院山西太原030024

为探究针对魔方型仓储系统的多AGV调度问题,建立考虑倒箱因素的多AGV调度优化数学模型,设计改进的多层编码的遗传算法,有助于算法跳出局部最优并改善其局部搜索能力。通过设计不同算例,对比优化前后的AGV调度方案,验证改进算法的有效性... 详细信息

为探究针对魔方型仓储系统的多AGV调度问题,建立考虑倒箱因素的多AGV调度优化数学模型,设计改进的多层编码的遗传算法,有助于算法跳出局部最优并改善其局部搜索能力。通过设计不同算例,对比优化前后的AGV调度方案,验证改进算法的有效性和可行性,同时,对不同任务规模、AGV规模、仓储填充率、仓储立体规模和仓储平面规模五方面的工况进行探究分析,为魔方型仓储系统运行状况研究提供理论基础。

关键词：魔方型仓储 AGV任务分配改进遗传算法

Automatic,long-term frequency-stabilized lasers with sub-hertz linewidth and 10-16 frequency instability

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Chinese Optics Letters 2022年第7期20卷 1-6页

作者： Chengzhi Yan haosen shi Yuan Yao Hongfu Yu Yanyi Jiang Longsheng Ma State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

We report two ultra-stable laser systems automatically frequency-stabilized to two high-finesse optical *** employing analog-digital hybrid proportional integral derivative(PID)controllers,we keep the merits of wide servo bandwidth and servo accuracy by using analog circuits for the PID controller,and,at the same time,we realize automatic laser frequency locking by introducing digital logic into the PID *** lasers can be automatically frequency-stabilized to their reference cavities,and it can be relocked in 0.3 s when interruption happens,i.e.,blocking and unblocking the laser *** automatic frequency-stabilized lasers are measured to have a frequency instability of 6×10^(-16)at 1 s averaging time and a most probable linewidth of 0.3 *** laser systems were tested for continuous operation over 11 *** ultrastable laser systems in long-term robust operation will be beneficial to the applications of optical atomic clocks and precision measurement based on frequency-stabilized lasers.

关键词： narrow-linewidth laser automatic frequency stabilization optical atomic clock gravitational wave detection

Frequency control of a lattice laser at 759 nm by referencing to Yb clock transition at 578 nm

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Chinese Optics Letters 2022年第12期20卷 1-5页

作者： Yaqin Hao Yuan Yao haosen shi Hongfu Yu Yanyi Jiang Longsheng Ma State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

We present the frequency control of a 759 nm laser as a lattice laser for an ytterbium(Yb)optical *** frequency stability and accuracy are transferred from the Yb optical clock via an optical frequency *** the comb is frequency-stabilized on a rubidium microwave clock,the frequency instability of the 759 nm laser is evaluated at the 10^(-15) level at 1 s averaging *** frequency of the 759 nm laser is controlled with an uncertainty within 1 Hz by referencing to the Yb clock *** a frequency-controlled 759 nm laser is suitable for Yb optical clocks as the lattice *** technique of laser frequency control can be applied to other lasers in optical clocks.

关键词： optical clock optical frequency comb laser frequency stabilization

Long-term frequency-stabilized optical frequency comb based on a turnkey Ti:sapphire mode-locked laser

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Chinese Optics Letters 2021年第12期19卷 51-56页

作者： Guang Yang haosen shi Yuan Yao Hongfu Yu Yanyi Jiang Albrecht Bartels Longsheng Ma State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China Novanta Europe GmbH Garching 85748Germany

We report a long-term frequency-stabilized optical frequency comb at 530–1100 nm based on a turnkey Ti:sapphire modelocked *** the help of a digital controller,turnkey operation is realized for the Ti:sapphire mode-locked *** optimized design of the laser cavity,the laser can be mode-locked over a month,limited by the observation *** combination of a fast piezo and a slow one inside the Ti:sapphire mode-locked laser allows us to adjust the cavity length with moderate bandwidth and tuning range,enabling robust locking of the repetition rate(f_(r)) to a hydrogen *** combining a fast analog feedback to pump current and a slow digital feedback to an intracavity wedge and the pump power of the Ti:sapphire mode-locked laser,the carrier envelope offset frequency(f_(ceo)) of the comb is *** extend the continuous frequency-stabilized time of the Ti:sapphire optical frequency comb to five *** residual jitters of f;and f;are 0.08 m Hz and 2.5 m Hz at 1 s averaging time,respectively,satisfying many applications demanding accuracy and short operation time for optical frequency combs.

关键词： optical frequency comb Ti:sapphire mode-locked laser phase lock optical atomic clock

Review of low timing jitter mode-locked fiber lasers and applications in dual-comb absolute distance measurement

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Nanotechnology and Precision Engineering 2018年第4期1卷 205-217页

作者： haosen shi Youjian Song Runmin Li Yuepeng Li Hui Cao Haochen Tian Bowen Liu Lu Chai Minglie Hu Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Technology Ministry of Education School of Precision Instruments and Opto-electronics Engineering Tianjin University

Passively mode-locked fiber lasers emit femtosecond pulse trains with excellent short-term stability. The quantum-limited timing jitter of a free running femtosecond erbium-doped fiber laser working at room temperature is considerably below one femtosecond at high Fourier frequency. The ultrashort pulse train with ultralow timing jitter enables absolute time-of-flight measurements based on a dual-comb implementation, which is typically composed of a pair of optical frequency combs generated by femtosecond lasers. Dead-zone-free absolute distance measurement with sub-micrometer precision and kHz update rate has been routinely achieved with a dual-comb configuration, which is promising for a number of precision manufacturing applications, from large step-structure measurements prevalent in microelectronic profilometry to three coordinate measurements in large-scale aerospace manufacturing and shipbuilding. In this paper, we first review the sub-femtosecond precision timing jitter characterization methods and approaches for ultralow timing jitter mode-locked fiber laser design. Then, we provide an overview of the state-of-the-art dual-comb absolute ranging technology in terms of working principles, experimental implementations, and measurement precisions. Finally, we discuss the impact of quantum-limited timing jitter on the dual-comb ranging precision at a high update rate. The route to highprecision dual-comb range finder design based on ultralow jitter femtosecond fiber lasers is proposed.

关键词： Timing jitter Mode-locked lasers Dual-comb Absolute distance measurement

Large-scale absolute distance measurement with dual free-running all-polarization-maintaining femtosecond fiber lasers

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Chinese Optics Letters 2019年第9期17卷 55-59页

作者： Yuepeng Li Yawen Cai Runmin Li haosen shi Haochen Tian Mingzhao He Youjian Song Minglie Hu Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Informa tion Science and Technology of Ministry of EducationSchool of Precision Instruments and Opto-electronics EngineeringTianjin UniversityTianjin 300072China Institute of Spacecraft System Engineering China Academy of Space TechnologyBeijing 100094China 'National Institute of MetrologyBeijing 100029China National Institute of Metrology Beijing 100029China

We demonstrate a robust femtosecond LIDAR setup by using two free-running environmentally stable allpolarization-maintaining nonlinear amplified loop mirror mode-locked fiber lasers. Based on the asynchronous optical sampling method, a ranging accuracy of ±2 μm within 65 m has been achieved, as tested in an 80-m-long underground optical tunnel. Through the Kalman filter in real-time data processing, the measurement accuracy can be maintained at a 200 Hz update rate. This setup provides a practical tool for various large-scale industrial and astronomical ranging applications.

关键词： distance measurement all-polarization-maintaining femtosecond fiber lasers

机器学习支持下的老年人步行环境满意度与适老环境改善策略研究

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西部人居环境学刊 2024年第2期39卷 35-40页

作者：杨林川唐祥龙杨皓森石亚灵西南交通大学建筑学院成都理工大学地理与规划学院

当前,我国正面临着严峻的人口老龄化挑战。鉴于步行的多重价值,营造适老社区步行环境已成为当务之急。本研究基于成都市1012名老年人对步行环境的满意度问卷调查数据,采用随机森林模型确定了各个步行环境指标的重要性,并进行了重要性—... 详细信息

当前,我国正面临着严峻的人口老龄化挑战。鉴于步行的多重价值,营造适老社区步行环境已成为当务之急。本研究基于成都市1012名老年人对步行环境的满意度问卷调查数据,采用随机森林模型确定了各个步行环境指标的重要性,并进行了重要性—绩效分析,明确了步行环境指标的改善优先级。研究结果显示,社区街景、生活服务设施可达性、步行道宽度和座椅可及性是影响老年人步行满意度最为显著的四个指标,而老年人对于十字路口间距和步行道连通性这两个指标的关注较为有限。座椅可及性、社区街景、商业中心可达性和休闲设施可达性需要优先改善。基于这些发现,提出了有针对性的社区适老步行环境改善策略,旨在为未来的政策设计和养老服务提供参考和借鉴。

关键词：人口老龄化随机森林重要性—绩效分析步行满意度老年友好步行环境老年友好城市