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Watt-level sub-100 fs third near-infrared window laser generated by self-seeded coherent Raman amplification based on erbium-ytterbium co-doped fiber

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High Power Laser Science and engineering 2024年第6期12卷 238-246页

作者： Jiaxuan Zhang Jintao Fan Minglie Hu Ultrafast Laser Laboratory Key Laboratory of Optoelectronic Information TechnologyMinistry of EducationSchool of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjinChina

In this paper, we prove that the third near-infrared(NIR-Ⅲ) window high-power laser with wavelength in the range of1600–1800 nm can be obtained by the coherent Raman fiber amplification technique through theoretical and experimental study. Detailed numerical simulation reveals that the nonlinear dynamics of the Raman fiber amplification in the polarization-maintaining double-clad erbium-ytterbium co-doped fiber is similar to that of the Mamyshev *** the spectral filtering effect induced by finite Raman gain, we can obtain a high-quality Raman pulse. According to the theoretical results, we design a simple Raman fiber amplification laser and finally obtain a high-quality watt-level NIR-Ⅲ window laser pulse in which the central wavelength is about 1650 nm and the pulse width can reach 85 fs. The experimental results correspond to the simulation results. Such nonlinear effect is universal in all kinds of fibers, and we think this technology can provide a great contribution to the development of ultrafast fiber lasers.

关键词： fiber amplifier nonlinear optics Raman scattering third near-infrared window ultrafast optics

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Parity-Time Symmetric Optoelectronic Oscillator Based on Four-Wave Mixing Effect in a Semiconductor Optical Amplifier 22

Parity-Time Symmetric Optoelectronic Oscillator Based on Fou...

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22nd International Conference on Optical Communications and Networks, ICOCN 2024

作者： Zhang, Jie Zhou, Jiaxin Duan, Shuonan Dai, Wentao Ge, Chunfeng Wang, Zhaoying School of Precision Instrument and Optoelectronics Engineering Tianjin University Tianjin China

Parity-time (PT) symmetric optoelectronic oscillator (OEO) based on the four-wave mixing (FWM) effect in a semiconductor optical amplifier (SOA) is proposed. A single-mode oscillating radio frequency (RF) signal at 9.... 详细信息

ISBN: (纸本)9798350367652

关键词： Four wave mixing

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A micro-nano optogenetic system based on probiotics for in situ host metabolism regulation

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Nano Research 2023年第2期16卷 2829-2839页

作者： Xinyu Zhang Ning Ma Wei Ling Gaoju Pang Tao Sun Jing Liu Huizhuo Pan Meihui Cui Chunli Han Chun Yang Jin Chang Xian Huang Hanjie Wang School of Life Sciences Tianjin UniversityTianjin 300072China School of Precision Instrument and Optoelectronics Engineering Tianjin UniversityTianjin 300072China School of Chemical Engineering&Technology Tianjin UniversityTianjin 300072China

Genetically engineered bacteria have aroused attention as micro-nano drug delivery systems in ***,conventional designs of engineered bacteria usually function constantly or autonomously,which might be non-specific or ***,designing and optimizing in situ control strategy are important methodological progress for therapeutic researches of intestinal engineered ***,a micro-nano optogenetic system based on probiotic was developed combining microelectronics,nanotechnology,and synthetic biology to achieve in situ controllable drug ***,optogenetic engineered Lactococcus lactis was orally administrated in the intestinal tract.A wearable optical device was designed to control optical signals ***,*** could be customized to secrete peptides according to optical *** an example,optogenetic *** system can be constructed to secrete glucagon-like peptide-1(GLP-1)under the control of the wearable optical device to regulate *** improve the half-life of GLP-1 in vivo,Fc-domain fused GLP-1 was optimally *** this strategy,blood glucose,weight,and other features were well controlled in rats and mice ***,upconversion microcapsules were introduced to increase the excitation wavelength of the optogenetic system for better *** strategy has biomedical potential to expand the toolbox for intestinal engineered bacteria.

关键词： synthetic biology optogenetics upconversion nanoparticles microelectronics diabetics

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Mechanically reconfigurable terahertz polarization converter by coupling-mediated metasurfaces

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Chinese Optics Letters 2024年第12期22卷 113-119页

作者： Zhibo Yao Zhaohua Xu Xiaoyuan Hao Jiajun He Yanfeng Zhao Xiangyu Liu Yanfeng Li Xueqian Zhang Quan Xu Su Xu Jiaguang Han Center for Terahertz Waves and State Key Laboratory of Precision Measurement Technology and Instruments College of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin 300072China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Guangxi Key Laboratory of Optoelectronic Information Processing School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin 541004China

Free manipulation of electromagnetic waves in the terahertz(THz)band based on metasurface functional devices has been the focus of research in recent *** these devices,active metasurfaces have generated extensive research interest due to their *** this work,we demonstrate a mechanically reconfigurable THz polarization converter that consists of two parallel transmissive metasurfaces with a tunable *** mechanically adjusting the coupling strength between the metasurfaces,the orthogonal polarization conversion of the incident linearly polarized THz waves can be ***,the device can be tuned from efficient dual-frequency orthogonal polarization conversion to efficient single-frequency orthogonal polarization *** a gradual decrease in efficiency,it is finally changed to a low transmission state as the gap distance increases from 150 to 800μ*** theoretically analyze the tuning process under different spacings and experimentally verify it using a vector network *** proposed design is straightforward and robust,with the potential to find wide applications in THz science and technology.

关键词： mechanically reconfigurable THz metasurface polarization converter tunable spacing vector network analyzer

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Pump quantum efficiency optimization of 3.5 μm Er-doped ZBLAN fiber laser for high-power operation

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Frontiers of optoelectronics 2023年第4期16卷 13-23页

作者： Lu Zhang Shijie Fu Quan Sheng Xuewen Luo Junxiang Zhang Wei Shi Jianquan Yao Institute of Laser and Optoelectronics School of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin 300072China Key Laboratory of Opto-Electronic Information Technology Ministry of EducationTianjin UniversityTianjin 300072China

976 nm+1976 nm dual-wavelength pumped Er-doped ZBLAN fiber lasers are generally accepted as the preferred solution for achieving 3.5μm ***,the 2μm band excited state absorption from the upper lasing level(^(4 )F_(9/2)→^(4)F_(7/2))depletes the Er ions population inversion,reducing the pump quantum efciency and limiting the power *** this work,we demonstrate that the pump quantum efciency can be efectively improved by using a long-wavelength pump with lower excited state absorption rate.A 3.5μm Er-doped ZBLAN fber laser was built and its performances at diferent pump wavelengths were experimentally investigated in detail.A maximum output power at 3.46μm of~7.2 W with slope efciency(with respect to absorbed 1990 nm pump power)of 41.2%was obtained with an optimized pump wavelength of 1990 nm,and the pump quantum efciency was increased to 0.957 compared with the 0.819 for the conventional 1976 nm pumping *** power scaling was only limited by the available 1990 nm pump power.A numerical simulation was implemented to evaluate the cross section of excited state absorption via a theoretical ftting of experimental *** potential of further power scaling was also discussed,based on the developed model.

关键词： Fiber laser Mid-infrared Er-doped ZBLAN fiber Dual-wavelength pumping

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Mid-Infrared Grating-Free All-Fiber Laser at 2.8 μm

Mid-Infrared Grating-Free All-Fiber Laser at 2.8 μm

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2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024

作者： Zhang, Junxiang Fu, Shijie Sheng, Quan Zhang, Lu Shi, Wei Yao, Jianquan Institute of Laser and Optoelectronics School of Precision Instrument and Optoelectronics Engineering Tianjin University Tianjin300072 China Tianjin University Tianjin300072 China

A mid-infrared 2.8 μm Er:ZBLAN fiber laser based on a grating-free all-fiber linear cavity is reported. Output power of 12.5 W and optical conversion efficiency of 22.1% were achieved. © 2024 The Author(s)

关键词： Fiber lasers

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A Polarization-Insensitive, Metamaterial-based Sensor for Permittivity Measurement of Liquids

A Polarization-Insensitive, Metamaterial-based Sensor for Pe...

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2024 IEEE International Conference on Computational Electromagnetics, ICCEM 2024

作者： Fang, Qirui Li, Kaiwen Zhang, Guozhen Yang, Jun School of Instrument Science and Optoelectronics Engineering Hefei University of Technology Anhui Province Key Laboratory of Measuring Theory and Precision Instrument Hefei230009 China

ISBN: (纸本)9798350383317

This paper proposes a reflective polarization-insensitive metamaterial-based sensor, comprising of an astroid-shaped resonance structure and a metal reflector, which can be used to detect the permittivity of liquid analytes. The resonance frequency of common edible oils such as canola oil, sunflower oil and olive oil are measured by the proposed sensor. In experiment, the resonance frequency are 128.3 GHz, 129.15 GHz and 130.5 GHz respectively, and their refractive indices being 1.54, 1.53, and 1.51, respectively. The sensitivity of the sensor is determined to be about 72.5 GHz/RIU, which makes it well-suited for the detection of analytes. © 2024 IEEE.

关键词： Metamaterials

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Dynamic uncertainty evaluation of dynamic time series based on mixture density network 11

Dynamic uncertainty evaluation of dynamic time series based ...

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11th International Symposium on precision Mechanical Measurements

作者： Wenshu, Jiang Hang, Liu Zhenying, Cheng Ruijun, Li Anhui Province Key Laboratory of Measuring Theory and Precision Instrument School of Instrument Science and Optoelectronics Engineering Hefei University of Technology Anhui Hefei230009 China

ISBN: (纸本)9781510680296

The dynamic measurement uncertainty is an important indicator to characterize dynamic measurement precision. A dynamic uncertainty evaluation method based on mixture density network (MDN) was proposed. The MDN is formed by combining the forward network which realizes the model parameters with the Gaussian mixture model. The dynamic measurement uncertainties were evaluated by taking a simulated stationary time series and the self-developed two-dimensional (2D) accelerometer as examples. A simulated stationary time series was input into the MDN model to verify the effectiveness of the proposed method. The predicted mean and standard deviation are basically consistent with the simulated mean and standard deviation. The mixed density network was also used to evaluate the dynamic mean and uncertainty of an accelerometer output signal. Time was used as the network input and the measured signal of the accelerometer was used as the network output to predict the change trend of the measured signal. Then,the dynamic measurement uncertainty model of the accelerometer was obtained. The mean values of the uncertainties for the X-axis and Y-axis are 0.0095 mm/s2 and 0.0038 mm/s2, respectively. The measured signals of X-axis and Y-axis are 97.6% and 98.4% within the envelope of uncertainty, respectively. The simulated results and the experimental results show that the proposed method for dynamic uncertainty evaluation can reliably evaluate the dynamic measurement uncertainty. © 2024 SPIE.

关键词： Accelerometers

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The Evolution of Spatial Coordinate Measurement Technology 4

The Evolution of Spatial Coordinate Measurement Technology

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4th IEEE International Conference on Power, Electronics and Computer Applications, ICPECA 2024

作者： Guo, Siyang Guo, Lei Yin, Shibin Xie, Hongbo Technology Company Limited Zhejiang Province Hangzhou China School of Precision Instrument and Optoelectronics Engineering Tianjin University Tianjin China

ISBN: (纸本)9798350359589

With continuous development of technology, the demand for spatial coordinate measurement has gradually increased. Based on the measurement characteristics, the coordinate measurement system is divided into the centralized measurement system and distributed measurement system and these systems are further classified. Some classical measurement systems are introduced in detail, including the measurement principle, the advantages and the shortcomings. At last this paper introduces the trends of the spatial coordinate measurement system and give a conclusion. © 2024 IEEE.

关键词： centralized measurement system distributed measurement system Spatial coordinate measurement technology

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The Research on a Tunable Self-oscillating Multicarrier Light Source 21

The Research on a Tunable Self-oscillating Multicarrier Ligh...

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21st International Conference on Optical Communications and Networks, ICOCN 2023

作者： Ban, Xinrui Zhou, Jiaxin Zhang, Jie Ge, Chunfeng Zhang, Hengkang Wang, Zhaoying Tianjin University School of Precision Instrument and Optoelectronics Engineering Tianjin China Beijing Institute of Control Engineering Beijing China

A tunable self-oscillating multicarrier source based on recirculating frequency shift loop and optoelectronic oscillator is proposed. 60 subcarriers with 2.48 dB flatness and tunable frequency intervals from 3.1 GHz t... 详细信息

ISBN: (纸本)9798350343502

关键词： Optoelectronic devices

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