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Advanced Lasers, High-Power Lasers, and Applications XV 2024

作者： Li, Hetian Hu, Guoqing Liu, Zhiyi Qin, Ying Wang, Junbiao Liu, Huawei Chen, Guangwei Liao, Xiaochun Liu, Ya Yan, Pengyu Li, Huiyu Zhang, Zhiyong Wu, Tengfei Zhou, Zhehai Key Laboratory of Modern Optoelectronic Measurement Technology in Mechanical Industry Beijing Information Science and Technology University Beijing100192 China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instruments Beijing Information Science and Technology University Beijing100192 China Yunnan Key Laboratory of Opto-Electronic Information Technology School of Physics and Electronic Information Technology Yunnan Normal University Kunming650500 China Yunnan Key Laboratory of the Solar Physics and Space Science Kunming650216 China Changcheng Institute of Metrology & Measurement Beijing100095 China

ISBN: (纸本)9781510681927

We experimentally investigated the build-up dynamics of single-cavity dual-wavelength-comb pulses emitted from a ring fiber cavity with Lyot filter configuration. Dual-wavelength lasers are firstly observed by adjusting the polarization controller to control Lyot filter effect. When the pump powers of the bidirectional pumps are set as 57 mW and 49 mW respectively, dual-wavelength pulses with the center wavelengths of 1546.2 nm and 1563.6 nm and spectral bandwidths of 2 nm and 1.6 nm are obtained. Subsequently, time-stretched dispersive Fourier transform spectroscopy is adopted to monitor the build-up process of dual-wavelength pulses. When switching on the pump diode, the three-stage build-up process from background noise to stable dual-wavelength pulses is experimentally observed. The build-up time is at the level of hundreds of milliseconds. These results provide a deep understanding of single-cavity dual-wavelength-comb pulse generation and contribute to the design and control of the single-cavity dual-comb pulses. © 2024 SPIE.

关键词： Fiber lasers

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Observation of synchronous nanosecond and femtosecond pulse propagation in a low-repetition-rate Er-doped fiber laser 11

Observation of synchronous nanosecond and femtosecond pulse ...

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Quantum and Nonlinear Optics XI 2024

作者： Qin, Ying Hu, Guoqing Zhao, Yue Chen, Li Zhang, Xiang Li, Hetian Chen, Guangwei Liao, Xiaochun Chen, Peng Liu, Ya Li, Huiyu Zhang, Zhiyong Wu, Tengfei Zhou, Zhehai Han, Jibo Bai, Yu Key Laboratory of Modern Optoelectronic Measurement Technology in Mechanical Industry Beijing Information Science and Technology University Beijing100192 China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instruments Beijing Information Science and Technology University Beijing100192 China Yunnan Key Laboratory of Opto-Electronic Information Technology School of Physics and Electronic Information Technology Yunnan Normal University Kunming650500 China Yunnan Key Laboratory of the Solar physics and Space Science Kunming650216 China Changcheng Institute of Metrology & Measurement Beijing100095 China

ISBN: (纸本)9781510682207

Synchronous nanosecond and femtosecond pulses delivered from a low-repetition-rate Er-doped fiber laser mode-locked by nonlinear polarization evolution is experimentally proposed. Here, the repetition rate is set as ∼4.5 MHz by introducing sufficiently long fiber in a ring cavity. By fully exploiting long fiber and anti-saturation absorption characteristics, it is experimentally observed that dissipative-soliton-resonance pulse with the nanosecond-level pulsewidth and femtosecond soliton pulse synchronously propagate in the same cavity. Besides, the pulsewidth of dissipative-soliton-resonance pulse and laser output power could be tailored by finely configuring the bidirectional pump powers. These results provide deep understanding of low-repetition-rate pulse laser and an intriguing way to obtain tunable dual-scale synchronous pulses, indicating the high potential for multiple-pulse laser processing and so on. © 2024 SPIE. All rights reserved.

关键词： Pulse repetition rate

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Delayed optical feedback-regulated artificial soliton molecule in a femtosecond optical parametric oscillator

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PhotoniX 2024年第1期5卷 34-53页

作者： Yu Cai Jintao Fan Fanchao Meng Youjian Song Minglie Hu Ultrafast Laser Laboratory State Key Laboratory of Precision Measurement Technology and InstrumentsTianjin UniversityTianjin 300072China Ultrafast Laser Laboratory College of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin 300072China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

Soliton molecules(SMs)play a crucial role in nonlinear optical systems,enriching our understanding of nonlinear science through the study of their interaction *** passively mode-locked fiber lasers offer an efficient platform for generating diverse types of SMs,the complex internal dynamics of the laser often pose challenges in achieving predetermined temporal separations between ***,we implement a delayed optical feedback technique within a femtosecond optical parametric oscillator,enabling the generation of SMs with precise and controllable temporal separations.A theoretical model,which models the intracavity iterations of the signal with a simplified Ikeda map,is proposed to study the impact of parametric gain,intracavity feedback delay,and cavity length on the internal separations of the *** experimental results confirm that adjusting the cavity length allows for producing desired temporal separations within *** reveal the evolution dynamics of the SMs,we further develop a rigorous numerical model using the carrier-resolved Forward Maxwell Equation,which is capable of modeling ultra-broadband complex dynamics based on a single equation without relying on the slowly-varying envelope *** numerical model unveils the rich formation dynamics of the SMs at various separations,which confirms the critical role of the gain window provided by the *** work opens up new opportunities for the on-demand generation of SMs and provides valuable insights into the complex dynamics in femtosecond optical parametric oscillator systems with optical delayed feedback.

关键词： Soliton molecule Femtosecond Optical parametric oscillator Delayed optical feedback

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Wavelength-switchable dual-wavelength pulse emission from a practical-filter-free all-fiber ring cavity 11

Wavelength-switchable dual-wavelength pulse emission from a ...

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Quantum and Nonlinear Optics XI 2024

作者： Hu, Guoqing Liao, Xiaochun Chen, Xujie Li, Hetian Chen, Guangwei Liu, Ya Yan, Pengyu Liu, JunPeng Huang, Hongbo Li, Huiyu Zhang, Zhiyong Wu, Tengfei Qin, Ying Zhou, Zhehai Key Laboratory of Modern Optoelectronic Measurement Technology in Mechanical Industry Beijing Information Science and Technology University Beijing100192 China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instruments Beijing Information Science and Technology University Beijing100192 China Yunnan Key Laboratory of Opto-Electronic Information Technology School of Physics and Electronic Information Technology Yunnan Normal University Kunming650500 China Yunnan Key Laboratory of the Solar physics and Space Science Kunming650216 China Changcheng Institute of Metrology & Measurement Beijing100095 China

ISBN: (纸本)9781510682207

We proposed the emission of wavelength-switchable dual-wavelength-comb pulses in a practical-filter-free cavity. Based on the polarization dependent loss based gain profile tuning, lasings in triple independent gain subregions, i.e. ∼1530-, ∼1543- and ∼1555-nm gain subregions, of erbium-doped fiber, are experimentally observed. Mode-locked by hybrid mechanisms combining carbon nanotube and nonlinear polarization evolution, triple types of dual-wavelength pulses distributed in different dual gain subregions are experimentally obtained. They are distributed in above triple gain subregions and could be switched by adjusting the intracavity polarization controller. These results provide a simple yet effective route to obtain dual-wavelength-comb pulses without additional practical filter and show the high potential in the applications of single-cavity dual-comb metrology. © 2024 SPIE. All rights reserved.

关键词： Bandpass filters

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Absolute distance measurement with a large non-ambiguity range based on a stable polarization-multiplexed dual-comb fiber laser 11

Absolute distance measurement with a large non-ambiguity ran...

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Optical Metrology and Inspection for Industrial Applications XI 2024

作者： Qin, Ying Hu, Guoqing Chen, Guangwei Zheng, Size Li, Hetian Liao, Xiaochun Liu, Ya Li, Huiyu Zhang, Zhiyong Zhao, Yue Chen, Li Zhang, Xiang Chen, Peng Wu, Tengfei Zhou, Zhehai Han, Jibo Bai, Yu Key Laboratory of Modern Optoelectronic Measurement Technology in Mechanical Industry Beijing Information Science and Technology University Beijing100192 China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instruments Beijing Information Science and Technology University Beijing100192 China Yunnan Key Laboratory of Opto-Electronic Information Technology School of Physics and Electronic Information Technology Yunnan Normal University Kunming650500 China Yunnan Key Laboratory of the Solar Physics and Space Science Kunming650216 China Changcheng Institute of Metrology & Measurement Beijing100095 China

ISBN: (纸本)9781510682108

We proposed an absolute distance measurement method with a large non-ambiguity range based on a polarization-multiplexed dual-comb fiber laser. By fully exploiting the intracavity linear loss based gain profile tilting and residual birefringence, polarization-multiplexed dual-comb pulses with tunable repetition rate difference and overlapping spectra in the 1530-nm gain region are obtained. The repetition frequency difference could be continuously tuned from ~89 to ~194 Hz. The alternative sampling under different repetition rate difference is experimentally verified to be effective approach to extend the non-ambiguity range in the single-cavity dual-comb ranging. The non-ambiguity range could reach thousands of kilometer while the precision could reach at least on the order of hundreds of micrometers. These results indicate a simple and intriguing route with a free-running laser source to obtain ranging with large non-ambiguity range, showing high potential in the applications such as satellite formation flying, large-scale 3D surface morphology measurement and so on. © 2024 SPIE.

关键词： Fiber lasers

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In situ calibrated angle between the quantization axis and the propagating direction of the light field for trapping neutral atoms

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Chinese Physics B 2024年第2期33卷 318-323页

作者：郭瑞军何晓东盛诚王坤鹏许鹏刘敏王谨孙晓红曾勇詹明生 Henan Key Laboratory of Laser and Optoelectronic Information National Center for International Joint Research of Electronic Materials and SystemsSchool of Electrical and Information EngineeringZhengzhou UniversityZhengzhou 450001China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China

The recently developed magic-intensity trapping technique of neutral atoms efficiently mitigates the detrimental effect of light shifts on atomic qubits and substantially enhances the coherence time. This technique relies on applying a bias magnetic field precisely parallel to the wave vector of a circularly polarized trapping laser field. However, due to the presence of the vector light shift experienced by the trapped atoms, it is challenging to precisely define a parallel magnetic field, especially at a low bias magnetic field strength, for the magic-intensity trapping of85Rb qubits. In this work, we present a method to calibrate the angle between the bias magnetic field and the trapping laser field with the compensating magnetic fields in the other two directions orthogonal to the bias magnetic field direction. Experimentally, with a constantdepth trap and a fixed bias magnetic field, we measure the respective resonant frequencies of the atomic qubits in a linearly polarized trap and a circularly polarized one via the conventional microwave Rabi spectra with different compensating magnetic fields and obtain the corresponding total magnetic fields via the respective resonant frequencies using the Breit–Rabi formula. With known total magnetic fields, the angle is a function of the other two compensating magnetic ***, the projection value of the angle on either of the directions orthogonal to the bias magnetic field direction can be reduced to 0(4)° by applying specific compensating magnetic fields. The measurement error is mainly attributed to the fluctuation of atomic temperature. Moreover, it also demonstrates that, even for a small angle, the effect is strong enough to cause large decoherence of Rabi oscillation in a magic-intensity trap. Although the compensation method demonstrated here is explored for the magic-intensity trapping technique, it can be applied to a variety of similar precision measurements with trapped neutral atoms.

关键词： quantization axis trapping laser angle compensating magnetic fields

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Interaction Quantification of MTDC Systems Connected with Weak AC Grids

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 2088-2099页

作者： Wanning Zheng Jiabing Hu Li Chai Bing Liu Zixia Sang Engineering Research Center of Metallurgical Automation and Measurement Technology Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China State Grid Hubei Economic Research Institute Wuhan 430077China

The small-signal stability of multi-terminal high voltage direct current(HVDC)systems has become one of the vital issues in modern power *** among voltage source converters(VSCs)have a significant impact on the stability of the *** paper proposes an interaction quantification method based on the self-/en-stabilizing coefficients of the general N-terminal HVDC system with a weak AC network ***,we derive the explicit formulae of self-/en-stabilizing coefficients for any N-terminal HVDC system,which can quantify the interactions through different paths *** relation between the self-/en-stabilizing coefficients and the poles of the system can be used to evaluate the impact of the interactions on the system stability ***,we employ the obtained formulae to analyze the parameter sensitivity and explain how a parameter affects the stability of the system through different paths of ***,extensive examples are given to demonstrate the effectiveness of the proposed method.

关键词： Interactions multi-terminal HVDC self-/enstabilizing coefficients small-signal stability

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A high-efficient triboelectric-electromagnetic hybrid nanogenerator for vibration energy harvesting and wireless monitoring

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science China(Information sciences) 2022年第4期65卷 229-237页

作者： Jian HE Xueming FAN Dongyang ZHAO Min CUI Bing HAN Xiaojuan HOU Xiujian CHOU Science and Technology on Electronic Test and Measurement Laboratory North University of China College of Mechatronic Engineering North University of China Beijing Institute of Computer Application China North Industries Group Corporation Limited

Scavenging mechanical vibration energy by combining triboelectric nanogenerators(TENGs) and electromagnetic generators(EMGs) is a renewable and low-carbon way to generate electric power. In this paper, we fabricate a cylindrical structure hybrid nanogenerator based on spring structure to effectively scavenge vibration energy. The introduction of spring structure not only enhances the space utilization, but also supports the moving magnet. Owing to its innovative structure, the instantaneous output power of TENG and EMG are 0.88 mW at a load of 10 MΩ and 216.7 mW at a load of 60 Ω, respectively. With the aids of a power management circuit, the hybrid nanogenerator can provide continuous power for two hygrothermographs connected in series. In addition, a self-powered wireless acceleration sensing monitoring system(SWAM) is developed to measure the acceleration signals of vibration sources. This study provides a novel guideline for harvesting mechanical vibration energy.

关键词： mechanical vibration energy spring structure triboelectric electromagnetic wireless monitoring system

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Perpendicularly assembled oriented electrospinning nanofibers based piezoresistive pressure sensor with wide measurement range

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Nano Research 2024年第7期17卷 6493-6501页

作者： Xiaoxue Bi Zhigang Duan Xiaojuan Hou Shuo Qian Mengjiao Yuan Jiajun Hu Jie Zhang Yuchen Lu Yanli Liu Jian He Zhiling Peng Xiujian Chou School of Mechanical and Electrical Engineering North University of ChinaTaiyuan 030051China Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China School of Software North University of ChinaTaiyuan 030051China School of Information and Communication Engineering North University of ChinaTaiyuan 030051China

With the rapid development of wearable electronics,flexible pressure sensors have attracted wide attention in human–computer interaction and intelligent ***,it is a challenge to achieve a sensor with high sensitivity,wide measurement range,and wearing ***,we develop an oriented electrospinning thermoplastic polyurethane/polyacrylonitrile(TPU/PAN)nanofibers(OETPN)based piezoresistive pressure sensor(PONPS)in which the active layer and the electrode are assembled *** interdigital electrode is fabricated by spraying silver nanowires(AgNWs)on the OETPN through a mask *** active layer is composed of OETPN coated with MXene,encapsulated on the electrode by polyurethane(PU)*** porous structure of nanofibers membrane broadens the measurement range of the *** oriented nanofibers as active layer can improve the sensitivity in low pressure,because oriented nanofibers without interweaving nanofibers are more compressible than disordered *** prepared using the spraying method creates nanoscale microstructure and increases *** perpendicular assembly has greater response between the active layer and the electrode than the parallel assembly to improve the *** sensor exhibits high sensitivity(6.71 kPa^(−1),0.02–2 kPa)and wide measurement range(0.02–700 kPa).The sensor can detect weak signals such as radial artery.A pressure array constructed precisely represents the distribution of *** intelligent throat is created by combining machine learning algorithms with the *** can detect and recognize subtle throat vibrations while speaking,achieving recognition accuracy up to 100%using support vector machine(SVM)for five words with different *** fabricated sensor shows promising prospects in personal healthcare and intelligent robots.

关键词： oriented nanofibers perpendicular assembly parallel assembly intelligent throat machine learning algorithms

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Research on a Method for Repairing Breakpoints in Temperature Data of Colorimetric Thermometers

Research on a Method for Repairing Breakpoints in Temperatur...

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2024 Applied Optics and Photonics China: Optoelectronics testing and measurement, AOPC 2024

作者： Xining, Wang Xiaojian, Hao Pan, Pei Wei, Wang Tong, Wei Shenxiang, Feng Chenyang, Xu Science and Technology on Electronic Test and Measurement Laboratory North University of China Shan’xi Province Taiyuan030051 China School of Instrument and Electronics North University of China Shanxi Taiyuan030051 China State Key Laboratory of Precision Measurement Technology and Instruments Tianjin University Tianjin300072 China MOEMS Education Ministry Key Laboratory Tianjin University Tianjin300072 China

ISBN: (数字)9781510687868

ISBN: (纸本)9781510687851

Due to its dynamic and non-invasive characteristics, it is difficult to obtain stable and accurate measurement results using contact thermocouple temperature measurement. The temperature measurement accuracy of infrared thermal imaging cameras in non-invasive temperature measurement is affected by factors such as flame emissivity and radiation path attenuation, and there is also a large temperature measurement error. Among them, the colorimetric thermometer can avoid the influence of the emissivity of the measured target, and has the advantages of high accuracy, strong anti-interference ability, and wide temperature measurement range. However, in engineering use, due to the energy zero points set by long-wave and short-wave radiation, the data calculated and output based on the principle of colorimetric thermometry has a "temperature breakpoint" phenomenon. Based on this kind of engineering situation, this paper proposes a temperature calibration method for colorimetric thermometers and a temperature data breakpoint repair method. The actual measurement and verification experiment of a high-temperature blackbody furnace has proven the effectiveness of this temperature data breakpoint repair method, providing more accurate temperature data values for experiments such as flame temperature testing. © 2024 SPIE.

关键词： Temperature measurement

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