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A High Sensitivity Laser-Pumped Cesium Magnetometer

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Chinese Physics Letters 2012年第10期29卷 18-20页

作者： HUANG Kai-Kai LI Nan LU Xuan-Hui Institute of optics Department of PhysicsZhejiang UniversityHangzhou 310027

An atomic magnetometer based on optically detected magnetic resonance is investigated and demonstrated *** build an 894 nm external cavity diode laser which is frequency locked to the F=4→F'=3 transition of Cs D_(1) line with DAVLL *** the phase-locked loop,the frequency of the rf coils is actively locked to the Larmor frequency and the magnetometer tracks the magnetic field variations in a phase coherent *** ultimate sensitivity of 19 fT/Hz^(1/2) and an intrinsic sensitivity of 8.6 pT/Hz^(1/2) in the magnetic environment which is close to geomagnetic field have been achieved with the spatial resolution smaller than 2 cm.

关键词： magnetometer cavity coherent

Transient responses of transparency in a far-off resonant atomic system

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Chinese Physics B 2014年第5期23卷 292-295页

作者：胡正峰杜春光邓见辽王育竹 The Key Laboratory of Quantum optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences department of Physics Tsinghua University

Transient coherent oscillations in a closed A system under far-off resonant Raman fields were investigated theoreti- cally. It has been found that the coherent superposition of the ground states can be formed due to the absorption even for initial maximal mixed ground states. The absorption oscillates with a period depending on the two-photon detuning when the system is initially in a transparent state and the two-photon Raman detuning is suddenly changed. The amplitude of the absorption decays with the decay rate of the ground states, which is different from the case when the lasers are applied resonantly. These transient coherent oscillations can be used to measure the relaxation rate of the ground states.

关键词： laser atom interaction coherent population trapping transient coherent oscillation three-level sys-tem

Low-cost,large-coverage,and high-flexibility coherent PON for next-generation access networks:advances,challenges,and prospects[Invited]

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Chinese optics Letters 2024年第4期22卷 26-35页

作者：邢思哲张俊文申王伟颜安李国强孙奥龙周骥郭栋施剑阳李子薇沈超迟楠 Key Laboratory of EMW Information(MoE) Fudan UniversityShanghai 200433China department of Communication Science and Engineering Shanghai ERC of LEO Satellite Communication and ApplicationsShanghai CIC of LEO Satellite Communication TechnologyFudan UniversityShanghai 200433China department of Electronic Engineering Jinan UniversityGuangzhou 510632China School of Information and electronics Beijing Institute of TechnologyBeijing 100081China

Increasing bandwidth requirements have posed significant challenges for traditional access *** is difficult for intensity modulation/direct detection to meet the power budget and flexibility requirements of the next-generation passive optical network(PON)at 100G and beyond considering the new *** is driving researchers to develop novel optical access ***-cost,wide-coverage,and high-flexibility coherent PON is emerging as a strong contender in the *** this article,we will review technologies that reduce the complexity of coherent PON(CPON),enabling it to meet the commercial ***,advanced algorithms and architectures that can enhance system coverage and flexibility are also discussed.

关键词： access network coherent optics flexible data rate low complexity wide dynamic range

Dual-dressed four-wave mixing and dressed six-wave mixing in a five-level atomic system

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Chinese optics Letters 2008年第9期6卷 685-688页

作者：左翠翠杜贻刚姜彤聂志强张彦鹏郑淮斌甘琛利张伟峰卢克清 Key Laboratory for Physical electronics and Devices of the Ministry of Education Xi'an Jiaotong University department of Physics University of ArkansasFayettevilleArkansas 72701USA State Key Laboratory of Transient optics and Technology Xi'an Institute of Optics and Precision MechanicsChinese Academy of Sciences

We study the co-existing four-wave mixing （FWM） process with two dressing fields and the six-wave mixing （SWM） process with one dressing field in a five-level system with carefully arranged laser beams. We also show two kinds of doubly dressing mechanisms in the FWM process. FWM and SWM signals propagating along the same direction compete with each other. With the properly controlled dressing fields, the FWM signals can be suppressed, while the SWM signals have been enhanced.

关键词： Mixing Storm sewers

All-fiber ring-cavity based frequency swept laser source for frequency domain OCT

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Chinese optics Letters 2010年第2期8卷 202-205页

作者：陈明惠丁志华徐磊吴彤王川史国华张雨东 State Key Lab of Modern Optical Instrumentation Zhejiang University Institute of optics and electronics Chinese Academy of Sciences

We develop a high-speed tunable, quasi-continuous-wave laser source for frequency domain （FD） optical coherence tomography （OCT）. The laser resonance is realized within a unidirectional all-fiber ring cavity consisting of a fiber coupler, two fiber isolators, a semiconductor optical amplifier （SOA）, and a fiber Fabry- Perot tunable filter （FFP-TF） for frequency tuning. Light output from the coupler is further amplified and spectral shaped by a booster SOA terminated at both ends with two isolators. The developed laser source provides up to 8000 sweeps per second over a full-width wavelength tuning range of 120 nm at center wavelength of 1320 nm with an average power of 9 mW, yielding an axial resolution of 13.6μm in air and a maximum sensitivity of about 112 dB for OCT imaging. The instantaneous linewidth is about 0.08 nm, enabling OCT imaging over an axial range of 3.4 mm in air. For optimization consideration based on this custom-built swept laser, experimental study on imaging quality relevant parameters of the swept laser with sine and ramp driving waveforms to the FFP-TF is conducted, and investigation of the swept laser on the cavity length is done. Implementing the laser source in our established swept source based OCT （SS-OCT） system, real-time structural imaging of biological tissue is demonstrated.

关键词： coherent light Fiber optics Fibers Frequency domain analysis Light amplifiers Optoelectronic devices Tomography Tuning

Dressed Four-Wave Mixing Spectroscopy Modified by Polarization Interference and Atom-Wall Collision in Micrometric Thin Cells

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Chinese Physics Letters 2010年第4期27卷 118-121页

作者：李院院李莉白晋涛李昌彪张彦鹏侯洵 Institute of optics and electronics Department of Physics Xi'an University of Arts and Science Xi'an 710065 Institute of Photonics and Photonic Technology Key Laboratory of Photoelectronic Technology of Shaanxi Province Northwest University Xi'an 710069 Key Laboratory for Physical electronics and Devices of the Ministry of Education Xi'an Jiaotong University Xi'an 710049 State Key Laboratory of Transient optics and Technology Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710068

Dressed four-wave mixing （DFWM） spectroscopy is investigated theoretically in some micrometric thin cells. It is found that DFWM spectra can be modified by polarization interference of atoms and transient effects induced by atom-wall collision. This modification can lead to width-narrowing of DFWM lines and facilitates to implement experiment of high resolution DFWM spectroscopy in a confined atomic system.

关键词： Atomic and molecular physics optics quantum optics and lasers

Experimental Demonstration of Electromagnetic Induced Transparency and Dispersion Effects in Cs Atom Vapour

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Chinese Physics Letters 2001年第12期18卷 1586-1588页

作者： ZHANG Jun-Xiang DONG Rui-Fang CHANG Hong XIE Chang-De PENG Kun-Chi XIAO Min The Key Laboratory of Quantum optics of Ministry of Education and Institute of Opto-electronics Shanxi UniversityTaiyuan 030006 department of Physics University of ArkansasFayettevilleArkansas 72701USA

The effects of the electromagnetically induced transparency and dispersion of a A-type three-level atomic system are experimentally measured with a vapour cell of Cs atoms. The steep dispersion at low absorption is ob... 详细信息

关键词： curve dispersion Dispersion

Highly efficient fiber to Si waveguide free-form coupler for foundry-scale silicon photonics

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Photonics Research 2024年第5期12卷 1055-1066页

作者： LUIGI RANNO JIA Xu BRIAN SIA COSMIN POPESCU DREW WENINGER SAMUEL SERNA SHAOLIANG YU LIONEL C.KIMERLING ANURADHA AGARWAL TIAN GU JUEJUN HU department of Materials Science&Engineering Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA Centre for Micro-&Nano-electronics(CMNE) Nanyang Technological UniversitySingapore 639798Singapore department of Physics Photonics and Optical EngineeringBridgewater State UniversityBridgewaterMassachusetts 02324USA Zhejiang Laboratory Hangzhou 311100China Materials Research Laboratory Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA

As silicon photonics transitions from research to commercial deployment,packaging solutions that efficiently couple light into highly compact and functional sub-micrometer silicon waveguides are imperative but remain *** 220 nm silicon-on-insulator(SOI)platform,poised to enable large-scale integration,is the most widely adopted by foundries,resulting in established fabrication processes and extensive photonic component *** development of a highly efficient,scalable,and broadband coupling scheme for this platform is therefore of paramount *** two-photon polymerization(TPP)and a deterministic free-form micro-optics design methodology based on the Fermat’s principle,this work demonstrates an ultraefficient and broadband 3-D coupler interface between standard SMF-28 single-mode fibers and silicon waveguides on the 220 nm SOI *** coupler achieves a low coupling loss of 0.8 dB for the fundamental TE mode,along with 1 dB bandwidth exceeding 180 *** broadband operation enables diverse bandwidthdriven applications ranging from communications to ***,the 3-D free-form coupler also enables large tolerance to fiber misalignments and manufacturing variability,thereby relaxing packaging requirements toward cost reduction capitalizing on standard electronic packaging process flows.

关键词： fiber waveguide enable

Optical two-dimensional coherent spectroscopy of excitons in transition-metal dichalcogenides

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Frontiers of physics 2024年第2期19卷 141-148页

作者： YanZuo Chen ShaoGang Yu Tao Jiang XiaoJun Liu XinBin Cheng Di Huang State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China MOE Key Laboratory of Advanced Micro-Structured Materials Shanghai Frontiers Science Center of Digital OpticsInstitute of Precision Optical Engineeringand School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China

Exciton physics in atomically thin transition-metal dichalcogenides(TMDCs)holds paramount importance for fundamental physics research and prospective ***,the experimental exploration of exciton physics,including excitonic coherence dynamics,exciton many-body interactions,and their optical properties,faces challenges stemming from factors such as spatial heterogeneity and intricate many-body *** this perspective,we elaborate upon how optical two-dimensional coherent spectroscopy(2DCS)emerges as an effective tool to tackle the challenges,and outline potential directions for gaining deeper insights into exciton physics in forthcoming experiments with the advancements in 2DCS techniques and new materials.

关键词： monolayer transition-metal dichalcogenides two-dimensional coherent spectroscopy