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Erbium-ytterbium co-doped lithium niobate single-mode microdisk laser with an ultralow threshold of 1μW

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Chinese Optics Letters 2024年第4期22卷 48-52页

作者：李明慧高仁宏黎春桃管江林张海粟林锦添赵光辉乔迁汪旻乔玲玲邓莉程亚 Chinese Academy of Sciences(CAS)Shanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China XXL—The Extreme Optoelectromechanics Laboratory School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China School of Physical Science and Technology Shanghai Tech UniversityShanghai 200031China Shanghai Research Center for Quantum Sciences Shanghai 201315China Hefei National Laboratory Hefei 230088China

We demonstrate single-mode microdisk lasers in the telecom band with ultralow thresholds on erbium-ytterbium co-doped thin-film lithium niobate(TFLN).The active microdisk was fabricated with high-Q factors by photolithography-assisted chemomechanical *** to the erbium-ytterbium co-doping providing high optical gain,the ultralow loss nanostructuring,and the excitation of high-Q coherent polygon modes,which suppresses multimode lasing and allows high spatial mode overlap between pump and lasing modes,single-mode laser emission operating at 1530 nm wavelength was observed with an ultralow threshold,under a 980-nm-band optical *** threshold was measured as low as 1μW,which is one order of magnitude smaller than the best results previously reported in single-mode active TFLN *** conversion efficiency reaches 4.06×10^(-3),which is also the highest value reported in single-mode active TFLN microlasers.

关键词： lithium niobate microcavities microdisk lasers

Response characteristics of sonar receiver under intense sound pulse

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Journal of Systems Engineering and Electronics 2012年第6期23卷 843-848页

作者： Kaizhuo Lei Qunfei Zhang Ziliang qiao lingling Zhang Qiang Huang Shiqing Wang College of Marine Engineering Northwestern Polytechnical University Xi' an 710072 P. R. China

For anti-jamming and anti-countermeasure techniques of the sonar receiver, the response characteristics of the automatic gain control （AGC） circuit and the survivability of the prime circuit under strong interference are analyzed by simulations and experiments. An AGC simulation model based on the voltage control amplifier VCA810 prototype is proposed. Then static and dynamic simulations are realized with single frequency signal and linear frequency modulated （LFM） signal commonly used in the active sonar. Based on intense sound pulse （ISP） interference experiments, the real-time response characteristics of each module of the receiver are studied to verify the correctness of the model as well as the simulation results. Simulation and experiment results show that, under 252 dB/20 μs ISP interference, the specific sonar receiver will produce sustained cut top oscillation above 30 ms, which may affect the receiver and block the regular sonar signal.

关键词： sonar receiver response characteristic simulationand experiment strong interference intense sound pulse (ISP),automatic gain control (AGC).

Second harmonic generation in a high-Q lithium niobate microresonator fabricated by femtosecond laser micromachining

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Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 50-54页

作者： LIN JinTian XU YingXin FANG ZhiWei WANG Min WANG NengWen qiao lingling FANG Wei CHENG Ya State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University School of Physical Science and Technology Shanghai Tech University University of Chinese Academy of Sciences

We report on second harmonic generation(SHG) in on-chip high-Q(>105) lithium niobate(Li Nb O3, LN) microresonators fabricated by femtosecond laser micromachining. We examine the efficiency of SHG with either a continuous-wave(CW) or an ultrashort pulsed pump laser. The normalized conversion efficiencies of SHG obtained with the CW and pulsed pump lasers are measured to be 1.35×10?5 m W?1 and 2.30×10?6 m W?1, respectively.

关键词： second harmonic generation femtosecond laser micromachining lithium niobate microresonator

Pool bio-oxidation and fitting analysis of low-grade arsenic-containing refractory gold ore

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Green Chemical Engineering 2024年第4期5卷 511-518页

作者： Jiafeng Li Linlin Tong Haijun Zhang qiao Chen Hongying Yang lingling Shen Yiqin Zhai Rongfan Yao School of Mines China University of Mining and Technology School of Metallurgy Northeastern University School of Chemical Engineering Technology China University of Mining and Technology School of Materials Science and Engineering Lanzhou University of Technology School of Intelligent Manufacturing Jiangsu Vocational Institute of Architectural Technology

To overcome the limitations of geography, climate, and ore characteristics on the ore beneficiation process, biooxidation studies on low-grade arsenic-bearing refractory gold ore by pool leaching were carried out, as well as process fitting analysis. The gold particles are encapsulated by pyrite and arsenopyrite. After 60 days of biooxidation, the oxidation rates of arsenic, sulfur, and gold were 39%～69%, 24%～41%, and 49%～83%, respectively. The inoculated Acidithiobacillus ferrooxidans, Ferroplasma acidiphilum, and Leptospirillum ferrodiazotrophum could all mediate the initial pyrite/arsenopyrite oxidation and the Fe2+oxidation reaction, but only the former could mediate the subsequent sulfur compound oxidation. When compared to daily bacterial circulation and bacterial replacement every ten days, aeration improved the gold leaching rate by 14%～22%. The Boltzmann model could fit both the arsenic and sulfur bio-oxidation, with model fit variances greater than 0.98. Based on the experimental and fitting results, the bio-oxidation cycle was determined to be 60 days, and the bio-oxidation mechanisms are summarized. This study has significant practical implications for the rational utilization of gold resources and provides theoretical and practical guidance for similar gold ores.

关键词： Refractory gold ore Bio-oxidation Pool leaching Boltzmann model

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基于整形飞秒激光脉冲的三维微纳制备

光学学报 2019年第1期39卷 200-209页

作者：乔玲玲储蔚王哲程亚中国科学院上海光学精密机械研究所强场激光物理国家重点实验室上海201800 华东师范大学物理与材料科学学院极端光机电实验室上海200241 上海科技大学物质科学与技术学院上海200031

飞秒激光脉冲加工具有热效应小、加工精度突破衍射极限、三维内部加工能力等特性,在微纳制备领域独具优势。综述了利用飞秒激光脉冲整形技术结合飞秒激光三维直写进行透明介质中微纳制备的最新进展,这些技术有望在新型集成光学和微纳光... 详细信息

飞秒激光脉冲加工具有热效应小、加工精度突破衍射极限、三维内部加工能力等特性,在微纳制备领域独具优势。综述了利用飞秒激光脉冲整形技术结合飞秒激光三维直写进行透明介质中微纳制备的最新进展,这些技术有望在新型集成光学和微纳光学中发挥重要的作用。

关键词：物理光学光学器件飞秒激光脉冲整形微加工

A visible-light-assisted Pd/TiO_(2)gas sensor with carbon nanotubes electrodes for trace formaldehyde detection

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Rare Metals 2024年第1期43卷 257-266页

作者： Can Liu qiao-qiao Zou Bin Liu Yong Zhang School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Hunan Institute of Advanced Sensing and Information Technology Xiangtan UniversityXiangtan 411105China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China

Owing to the ppb-level detection standard toward the toxic and harmful gas,the detection of trace gases has become an important subject in the field of indoor environment ***,the traditional resistive gas sensors hardly meet the requirement due to the weak signal generated by trace gas molecules that are difficult to ***,a visible-light-assisted Pd/TiO_(2)gas sensor is proposed to endow the effective detection of trace formaldehyde(HCHO)gas without heating *** from the enhanced photocatalytic properties of TiO_(2)by Pd decoration,the visible-light-assisted Pd/TiO_(2)gas sensor can detect the HCHO gas as low as80×10^(–9)at room *** successful preparation of nanoscale TiO_(2)sensing layer is facilitated by the ultrathin carbon nanotube interdigital electrode in the gas sensor,which avoids the discontinuity of the sensing layer caused by the excessive thickness of the traditional metal *** addition,the whole preparation process of the Pd/TiO_(2)gas sensor with carbon nanotube electrodes is compatible with mainstream CMOS fabrication technology,which is expected to realize the batch fabrication and micro-integrated application of gas *** is expected that our work can provide a new strategy for the batch preparation of high-performance trace HCHO gas sensors and their future applications in portable electronic devices such as smartphones.

关键词： Visible-light-assisted gas sensor Pd/TiO_(2) Trace HCHO detection Carbon nanotubes electrodes

ROS-responsive hydrogels with spatiotemporally sequential delivery of antibacterial and anti-inflammatory drugs for the repair of MRSA-infected wounds

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Regenerative Biomaterials 2024年第1期3卷 119-131页

作者： Bowen qiao Jiaxin Wang Lipeng qiao Aziz Maleki Yongping Liang Baolin Guo Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Mechanical Behavior of Materials Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Zanjan Pharmaceutical Nanotechnology Research Center(ZPNRC) Zanjan 45139-56184Iran Department of Orthopaedics The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061People’s Republic of China

For the treatment of MRSA-infected wounds,the spatiotemporally sequential delivery of antibacterial and anti-inflammatory drugs is a promising *** this study,ROS-responsive HA-PBA/PVA(HPA)hydrogel was prepared by phenylborate ester bond cross-linking between hyaluronic acid-grafted 3-amino phenylboronic acid(HA-PBA)and polyvinyl alcohol(PVA)to achieve spatiotemporally controlled release of two kinds of drug to treat MRSA-infected *** hydrophilic antibiotic moxifloxacin(M)was directly loaded in the *** hydrophobic curcumin(Cur)with anti-inflammatory function was first mixed with Pluronic F127(PF)to form Cur-encapsulated PF micelles(Cur-PF),and then loaded into the HPA *** to the different hydrophilic and hydrophobic nature of moxifloxacin and Cur and their different existing forms in the HPA hydrogel,the final HPA/M&Cur-PF hydrogel can achieve different spatiotemporally sequential delivery of the two *** addition,the swelling,degradation,self-healing,antibacterial,anti-inflammatory,antioxidant property,and biocompatibility of hydrogels were ***,in the MRSA-infected mouse skin wound,the hydrogel-treated group showed faster wound closure,less inflammation and more collagen *** experiments further confirmed that the hydrogel promoted better repair by reducing inflammation(TNF-a)and promoting vascular(VEGF)*** conclusion,this HPA/M&CurPF hydrogel that can spatiotemporally sequential deliver antibacterial and anti-inflammatory drugs showed great potential for the repair of MRSA-infected skin wounds.

关键词： MRSA-infected wounds spatiotemporally sequential delivery antibacterial anti-inflammatory

Data-Driven Direct Adaptive Risk-Sensitive Control of Stochastic Systems

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Journal of Systems Science & Complexity 2024年第4期37卷 1446-1469页

作者： qiao Nan LI Tao School of Mathematical Sciences East China Normal UniversityShanghai 200241China Shanghai Key Laboratory of Pure Mathematics and Mathematical Practice School of Mathematical SciencesEast China Normal UniversityShanghai 200241China

The authors propose a data-driven direct adaptive control law based on the adaptive dynamic programming(ADP) algorithm for continuous-time stochastic linear systems with partially unknown system dynamics and infinite horizon quadratic risk-sensitive *** authors use online data of the system to iteratively solve the generalized algebraic Riccati equation(GARE) and to learn the optimal control law *** the case with measurable system noises,the authors show that the adaptive control law approximates the optimal control law as time goes *** the case with unmeasurable system noises,the authors use the least-square solution calculated only from the measurable data instead of the real solution of the regression equation to iteratively solve the *** authors also study the influences of the intensity of the system noises,the intensity of the exploration noises,the initial iterative matrix,and the sampling period on the convergence of the ADP ***,the authors present two numerical simulation examples to demonstrate the effectiveness of the proposed algorithms.

关键词： Adaptive dynamic programming direct adaptive control generalized algebraic Riccati equation risk-sensitive control

Electro-optic tuning of a single-frequencyultranarrow linewidth microdisk laser

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Advanced Photonics 2022年第3期4卷 105-113页

作者： Jintian Lin Saeed Farajollahi Zhiwei Fang Ni Yao Renhong Gao Jianglin Guan Li Deng Tao Lu Min Wang Haisu Zhang Wei Fang lingling qiao Ya Cheng Chinese Academy of Sciences(CAS) Shanghai Institute of Optics and Fine Mechanics(SIOM)State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-Intense Laser ScienceShanghaiChina University of Chinese Academy of Sciences Center of Materials Science and Optoelectronics EngineeringBeijingChina University of Victoria Department of Electrical and Computer EngineeringVictoriaBritish ColumbiaCanada East China Normal University School of Physics and Electronic ScienceXXL—The Extreme Optoelectromechanics LaboratoryShanghaiChina Research Center for Intelligent Sensing Zhejiang LabHangzhouChina Zhejiang University College of Optical Science and EngineeringThe Interdisciplinary Center for Quantum InformationState Key Laboratory of Modern Optical InstrumentationHangzhouChina East China Normal University State Key Laboratory of Precision SpectroscopyShanghaiChina Jiaxing Institute of Zhejiang University Intelligent Optics&Photonics Research CenterJiaxingChina Shanxi University Collaborative Innovation Center of Extreme OpticsTaiyuanChina Shandong Normal University Collaborative Innovation Center of Light Manipulations and ApplicationsJinanChina Shanghai Research Center for Quantum Sciences Shang

Single-frequency ultranarrow linewidth on-chip microlasers with a fast wavelength tunability play a game-changing role in a broad spectrum of applications ranging from coherent communication,light detection and ranging,to metrology and *** and fabrication of such light sources remain a challenge due to the difficulties in making a laser cavity that has an ultrahigh optical quality(Q)factor and supports only a single lasing frequency ***,we demonstrate a unique single-frequency ultranarrow linewidth lasing mechanism on an erbium ion-doped lithium niobate(LN)microdisk through simultaneous excitation of high-Q polygon modes at both pump and laser *** the polygon modes are sparse within the optical gain bandwidth compared with the whispering gallery mode counterpart,while their Q factors(above 10 million)are even higher due to the significantly reduced scattering on their propagation paths,single-frequency lasing with a linewidth as narrow as 322 Hz is *** measured linewidth is three orders of magnitude narrower than the previous record in on-chip LN ***,enabled by the strong linear electro-optic effect of LN,real-time electro-optical tuning of the microlaser with a high tuning efficiency of∼50 pm∕100 V is demonstrated.

关键词： lasers lithium niobate microcavities integrated opti