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High-resolution mid-infrared single-photon upconversion ranging

Photonics Research 2024年第6期12卷 1294-1302页

作者： SHUHONG JIANG KUN HUANG TINGTING YU JIANAN FANG BEN SUN YAN LIANG QIANG HAO E.WU MING YAN heping zeng State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing 401121China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China School of Optical Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Research Center for Quantum Sciences Shanghai 201315China Guangyang Bay Laboratory Chongqing Institute for Brain and IntelligenceChongqing 400064China

Single-photon laser ranging has widespread applications in remote sensing and target ***,highly sensitive light detection and ranging(lidar)has long been restricted in the visible or near-infrared *** appealing quest is to extend the operation wavelength into the mid-infrared(MIR)region,which calls for an infrared photon-counting system at high detection sensitivity and precise temporal ***,we devise and demonstrate an MIR upconversion lidar based on nonlinear asynchronous optical ***,the infrared probe is interrogated in a nonlinear crystal by a train of pump pulses at a slightly different repetition rate,which favors temporal optical scanning at a picosecond timing resolution and a kilohertz refreshing rate ***,the cross-correlation upconversion trace is temporally stretched by a factor of 2×10^(4),which can thus be recorded by a low-bandwidth silicon *** combination with the time-correlated photon-counting technique,the achieved effective resolution is about two orders of magnitude better than the timing jitter of the detector itself,which facilitates a ranging precision of 4μm under a low detected flux of 8×10^(−5) photons per *** presented MIR time-of-flight range finder is featured with single-photon sensitivity and high positioning resolution,which would be particularly useful in infrared sensing and imaging in photon-starved scenarios.

关键词： resolution lidar repetition

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On the generation of high-quality Nyquist pulses in mode-locked fiber lasers

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Chinese Physics B 2024年第3期33卷 424-427页

作者：任俞宣葛锦蔓李小军彭俊松曾和平 State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China National Key Laboratory of Science and Technology on Space Microwave China Aerospace Science and TechnologyXi'an 710100China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing 401120China Jinan Institute of Quantum Technology Jinan 250101China

Nyquist pulses have wide applications in many areas,from electronics to ***-locked lasers are ideal platforms to generate such ***,how to generate high-quality Nyquist pulses in mode-locked lasers remains *** address this problem by managing different physical effects in mode-locked fiber lasers through extensive numerical *** find that net dispersion,linear loss,gain and filter shaping can affect the quality of Nyquist pulses *** also demonstrate that Nyquist pulses experience similariton shaping due to the nonlinear attractor effect in the gain *** work may contribute to the design of Nyquist pulse sources and enrich the understanding of pulse shaping dynamics in mode-locked lasers.

关键词： mode locking laser soliton fiber pulse

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Dissipative soliton resonance within different dispersion regimes in a single mode-locked laser

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Chinese Physics B 2024年第7期33卷 368-372页

作者：赵哲韬舒沁珂解梓怡任俞宣张颖袁博赵春勃彭俊松曾和平 State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China China Academy of Space Technology Xi'an 710100China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing 401120China Chongqing Institute for Brain and Intelligence Guangyang Bay LaboratoryChongqing 400064China

Dissipative soliton resonance(DSR) was previously studied in separated mode-locked fiber lasers within different dispersion regimes including anomalous, near-zero and normal dispersion. Here we propose a method to study DSR in a single mode-locked laser in these different dispersion regimes. This is achieved by virtue of a waveshaper which can control the laser dispersion readily using software, avoiding the usual tedious cutback method. We find that dispersion has a negligible effect on DSR since the pulse duration keeps constant while dispersion is varied. Moreover, we examine the dynamics of DSR on the parameters of the SA including modulation depth and saturation power, and find that the pulse duration can be changed in a large range when the saturation power is decreased. Our numerical simulations could be important to guide relative experimental studies.

关键词： mode locking laser fiber pulse

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Single-photon detection and its applications

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Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1218-1232页

作者： LIANG Yan zeng heping Shanghai Key Laboratory of Modern Optical System Engineering Research Center of Optical Instrument and System Ministry of Education School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology State Key Laboratory of Precision Spectroscopy East China Normal University

A single-photon detector is an extremely sensitive device capable of registering photons,offering essential technical support for optics quantum information *** review herein our recent experimental progress in the development and application of single-photon detection *** based on advanced self-differencing,low-pass filtering,frequency up-conversion and photon-number-resolving are introduced for attaining high-speed,high-efficiency,low-noise single-photon detection at infrared *** advantages of high-speed single-photon detection are discussed in some applications,such as the laser ranging and quantum key *** photon-number-resolving detection is shown to support efficient quantum random number generation.

关键词： quantum optics photodetection avalanche photodiode frequency up-conversion

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Squeezed Vibrational States in a Quantized Trap

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Chinese Physics Letters 1995年第4期12卷 203-206页

作者： zeng heping LIN Fucheng Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

The quantized center of mass(c.m.)motion of a single two-level atom or ion confined in a one-dimensional harmonic potential and interacting with a single-mode classical traveling laser field,is *** show that both quadrature and amplitude squared squeezed vibrational states can be generated in this simple trap model when *** is initially in a certain coherent trap state.

关键词： initially traveling coherent

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Nonclassical Bose-Einstein Condensate

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Chinese Physics Letters 1995年第10期12卷 593-596页

作者： zeng heping LIN Fucheng Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

A scheme for the generation of a nonclassical Bose-Einstein condensate is proposed in a J_(g)=1→J_(e)=0 system where ultracold atoms are populated in one ground-state sublevel|g_〉and form a Bose-Einstein *** coupling the condensate to copropagating classical(σ^(-))and quantum(σ^(+))non-resonant travelling-wave laser fields,effective two-photon excitations between two ground-state sublevels|g_〉and|g+〉create a new condensate in|g+〉.For an appropriate selection of the interaction time and atom-field coupling strengths,the quantum features of the quantized laser field,which may be prepared in a certain nonclassical state,can be exchanged with those of the quantum density field of the generated condensate.

关键词： Einstein quantum coupling

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分形激光精密控制研究综述

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计测技术 2024年第3期44卷 3-20页

作者：曾和平吴修齐彭俊松华东师范大学精密光谱科学与技术国家重点实验室华东师范大学重庆研究院上海量子科学研究中心重庆脑与智能科学中心

介绍了单通光纤中的孤子分形、矢量孤子碰撞中的分形、自旋波孤子中的分形、呼吸子激光中的分形等激光器中存在的典型分形结构及相关调控方法，阐述了锁模激光器中分形激光频谱密度高、调谐精度高、能够实现高分辨力飞秒光纤光梳等特点... 详细信息

介绍了单通光纤中的孤子分形、矢量孤子碰撞中的分形、自旋波孤子中的分形、呼吸子激光中的分形等激光器中存在的典型分形结构及相关调控方法，阐述了锁模激光器中分形激光频谱密度高、调谐精度高、能够实现高分辨力飞秒光纤光梳等特点。探讨了提升飞秒光纤光梳分辨力的问题，指出利用呼吸子激光中的魔鬼阶梯和法里树分形结构，结合智能调谐手段可提升飞秒光纤光梳的探测分辨力。展望了呼吸子分形光梳在分子光谱、任意光波合成等领域的发展方向，指出未来通过发展光频域高精度锁定技术、时频相位全息跟踪探测技术、分形频谱关联与相噪分析技术，并优化理论模型，有望进一步抑制光梳的噪声，并突破谱密度极限。

关键词：分形呼吸子智能控制非线性动力学光纤激光器

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Low-noise InGaAs/InP single-photon detector with widely tunable repetition rates

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Photonics Research 2019年第3期7卷 I0001-I0006页

作者： YAN LIANG QILAI FEI ZHIHE LIU KUN HUANG heping zeng Shanghai Key Laboratory of Modern Optical Systems Engineering Research Center of Optical Instruments and Systems Ministry of EducationSchool of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology State Key Laboratory of Precision Spectroscopy East China Normal University

InGaAs/InP avalanche photodiodes typically work in the gated Geiger mode to achieve near-infrared singlephoton detection. By using ultrashort gates and combining with the robust spike-canceling technique that consists of the capacitance-balancing and low-pass filtering technique, we demonstrate an InGaAs/InP single-photon detector(SPD) with widely tunable repetition rates in this paper. The operation frequency could be tuned conveniently from 100 MHz to 1.25 GHz with the SPD's performance measured to maintain good performance, making it quite suitable for quantum key distribution, laser ranging, and optical time domain reflectometry. Furthermore,the SPD exhibited extremely low-noise characteristics. The detection efficiency of this SPD could reach 20% with the dark count rate of 2.5 × 10^(-6)∕gate and after-pulse probability of 4.1% at 1 GHz.

关键词： InGaAs/InP single-photon detector achieve near-infrared singlephoton detection robust spike-canceling technique

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Quantum key distribution in 50-km optic fibers

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Science China(Physics,Mechanics & Astronomy) 2004年第2期47卷 182-188页

作者： ZHOU Chunyuan WU Guang CHEN Xiuliang LI Hexiang zeng heping Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China

In this paper, we report our recent experiment of long-distance fiber-optic plug and play quantum cryptography system wherein a Faraday-Mirror was used to compensate for the polarization mode dispersion and phase drifts. The pulse-biased coincident gate single-photon detection technique was used to effectively reduce the noises from the detrimental Rayleigh backscattering. We have achieved a quantum key distribution system with the working distance of 50 km, which was tested to be stable in more than 6 hours continuous work. And we also demonstrated the practical quantum communication in a local area network using the TCP protocol.

关键词： quantum cryptography, single-photon interference, polarization mode dispersion, phase- modula.

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Morphology-controlled Electrodeposition of Copper Nanospheres onto FTO for Enhanced Photocatalytic Hydrogen Production

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Chinese Journal of Chemistry 2018年第1期36卷 31-36页

作者： Jieyun He Heshan Feng Ting Wang Tingting Wang heping zeng Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou Guangdong 510641 China

Using CuSO4 as the copper source, nanostructured copper with four different morphologies was obtained by electrodeposition method on FTO substrates. The as-synthesized Cu/FTO samples were characterized by X-ray diffraction （XRD）, diffuse reflectance spectroscopy （DRS）, Raman, X-ray photoelectron spectroscopy （XPS）, scanning electron microscopy （SEM）, energy-dispersive X-ray spectroscopy （EDS）, and transmission electron micros- copy （TEM）. The effects of electrodeposition potential and electrodeposition time on the Cu/FTO samples and the photocatalytic performance were investigated systematically. The results showed that the Cu/FTO samples were well-crystallized and the morphologies could be changed from nanoslices to nanodendrites structure with the negative shift of the depositing potential. The electrodeposition potential and time have a significant effect on the amount of Hz evolution. The obtained Cu nanospheres which were prepared at the potential of-0.65 V for 600 s showed the best photocatalytic behavior. The mechanisms for the photocatalytic activities were also discussed.

关键词： nano-structured Cu surface plasmon resonance hydrogen production

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