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Investigating the dynamic mechanical behaviors of polyurea through experimentation and modeling

Defence technology（防务技术） 2019年第6期15卷 875-884页

作者： Hao Wang Ximin Deng Haijun Wu Aiguo Pi Jinzhu Li Fenglei Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Wuhan Guide Infrared Co. LtdWuhan430000China

Polyurea is widely employed as a protective coating in many fields because of its superior ability to improve the anti-blast and anti-impact capability of *** this study,the mechanical properties of polyurea XS-350 were investigated via systematic experimentation over a wide range of strain rates(0.001-7000 s^-1)by using an MTS,Instron VHS,and split-Hopkinson *** stress-strain behavior of polyurea was obtained for various strain rates,and the effects of strain rate on the primary mechanical properties were ***,a modified rate-dependent constitutive model is proposed based on the nine-parameter Mooney-Rivlin *** results show that the stress-strain curves can be divided into three distinct regions:the linear-elastic stage,the highly elastic stage,and an approximate linear region terminating in *** mechanical properties of the polyurea material were found to be highly dependent on the strain ***,a comparison between model predictions and the experimental stress-strain curves demonstrated that the proposed model can characterize the mechanical properties of polyurea over a wide range of strain rates.

关键词： Polyurea Strain rate effect Dynamic mechanical properties Constitutive model

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Ultra-high-efficiency circularly polarized reflector based on the dislocated double rectangle arrays

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Optik 2025年 328卷

作者： Cheng, Bo Jiang, Botao Zou, Yuxiao Song, GuoFeng Postdoctoral Innovation Practice Base Chengdu Polytechnic 83 Tianyi Street Sichuan Chengdu610041 China Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing100049 China Kunming Institute of Physics Yunnan Kunming650223 China National Key Laboratory of Infrared Detection Technologies Kunming Institute of Physics Yunnan Kunming650223 China

The chiral lasers that can directly generate the circularly polarized light have important applications in a variety of fields, such as optical communications, biomedicine, materials processing, and optical measurements, and they are rapidly becoming an offshoot of the new generation of smart optoelectronic devices. However, the performance of current circularly polarized lasers is still limited by the effective design of chiral nanostructures, and their circular dichroism (CD) generally does not exceed 5 %. With the powerful optical modeling capability of the COMSOL Multiphysics platform, we innovatively introduce two dislocated rectangular blocks to break the spatial symmetry of the metasurface and obtain a huge chirality (CD > 95 %). This is then combined with a cylindrical array to form a Fabry–Pérot (FP) resonant cavity corresponding to a typical optical ternary system, which pushes the peak reflectivity of the cascaded metasurface to 99.6 %. Our designed chiral cascade metasurfaces simultaneously satisfy the demanding requirements of high reflectivity and large circular dichroism, and are expected to replace the conventional multilayer distributed bragg reflectors (DBRs) in VCSELs, contributing to the further development of miniaturized chiral lasers. © 2025 Elsevier GmbH

关键词： Circular polarization

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High Power Diode-Pumped Er:Y2O3 Ceramic Laser at 2.7 μm

High Power Diode-Pumped Er:Y2O3 Ceramic Laser at 2.7 μm

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Advanced Solid State Lasers, ASSL 2021 - Part of Laser Congress, LAC 2021

作者： Ding, Manman Li, Xuanxi Wang, Jun Tang, Dingyuan Shen, Deyuan Zhu, Heyuan Department of Optical Science and Engineering Fudan University Shanghai200433 China Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou221116 China Jiangsu Institute of Mid Infrared Laser Technology and Applications Xuzhou221000 China

We demonstrate an Er:Y2O3 ceramic laser at ~2.7 μm pumped with a 976 nm laser diode. 8.8 W of output power with a slope efficiency of 16.6% respect to the absorbed pump power was obtained. © 2021 The Author(s).

ISBN: (纸本)9781557528209

关键词： Pumping (laser)

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Nanostructured active fiber for mode-locked and Q-switched all-fiber laser systems

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Journal of Lightwave technology 2025年

作者： Wang, Yutian Buczynski, Ryszard Krupa, Katarzyna Barton, Ivo Aubrecht, Jan Kamradek, Michal Fu, Songnian Tang, Ming Franczyk, Marcin Stepanenko, Yuriy Klimczak, Mariusz Kasik, Ivan Peterka, Pavel Zhao, Luming Huazhong University of Science and Technology School of Optical and Electronic Information Wuhan National Laboratory for Optoelectronics Optics Valley Laboratory Wuhan430074 China University of Warsaw Faculty of Physics Warsaw02-093 Poland Lukasiewicz Research Network - Institute of Microelectronics and Photonics Department of Optical Fiber Technology Warsaw02-668 Poland Polish Academy of Sciences Institute of Physical Chemistry Warsaw01-224 Poland Institute of Photonics and Electronics of the Czech Academy of Sciences Prague182 51 Czech Republic Guangdong University of Technology Advanced Institute of Photonics Technology School of Information Engineering Guangdong Provincial Key Laboratory of Information Photonics Technology Guangzhou51006 China Jiangsu Institute of Mid Infrared Laser Technology & Applications Xuzhou221000 China

Mode-locked and Q-switched all-fiber lasers using nanostructured core silica fiber are demonstrated. A novel active fiber has been developed, consisting of a collection of discrete nanorods doped with ytterbium and erbium within an aluminosilicate matrix. The arrangement of nanorods within the fiber core dictates the spatial distribution of amplification and refractive index, enabling the tailored design of the fiber's modal characteristics and dispersion properties. We demonstrate that the employed pumping strategy, which involves stimulating Yb3+ ions situated in nanorods and leveraging a non-radiative energy transfer from Yb3+ to Er3+ ions in distinct nanorods, is effective. This approach facilitates efficient laser performance comparable to fibers with a continuous dispersion of active ions throughout the core. The femtosecond mode-locked pulse at wavelength of 1560 nm, featuring a bandwidth of 5.2 nm, a pulse duration of 860 femtoseconds, and an RF spectral purity with an extinction ratio of 80 dB has been successfully obtained. These results underscore the potential of the nanostructured core fiber concept as an active medium in ultrafast, all-fiber devices © 1983-2012 IEEE.

关键词： Nanorods

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High repetition rate, tunable mid-infrared vortex beam generation based on ZGP optical parametric oscillator

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Optics Communications 2025年 589卷

作者： Meng, Jun Wang, Fei Liu, Gaoyou Liu, Zhaojun School of Information Science and Engineering and Key Laboratory of Laser and Infrared System of Ministry of Education Shandong University Qingdao266237 China Shandong Provincial Key Laboratory of Laser Technology and Application Qingdao266237 China

We present a tunable, high-repetition-rate mid-infrared vortex laser based on ZnGeP2 (ZGP) optical parametric oscillator (OPO) with a singly resonant plane-parallel cavity which was pumped by a 2.1 μm vortex laser. The signal wavelength was tunable from 3.4 to 4.1 μm by rotating the ZGP crystal, while the corresponding idler output ranged from 4.2 to 5.3 μm. The signal vortex beam retained the same topological charge as the pump, while the idler beam exhibited a Gaussian intensity profile. At pulse repetition frequency of 10 kHz, the system achieved maximum output powers of 6.5 W for the signal (3.89 μm) and 5 W for the idler (4.55 μm), with pulse widths of 60.3 ns and 54.8 ns, respectively. This work demonstrates a highly efficient and flexible approach to generating vortex beams in the mid-infrared, advancing the potential for applications in high-resolution imaging, spectroscopy, and nonlinear optics. © 2025

关键词： Optical parametric oscillators

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Photoluminescence Mapping of Mid-Wave infrared Inas/Gasb Type Ii Superlattice: Influence of Materials and Processes on In-Plane Optoelectronic Uniformity

SSRN

引用

SSRN 2022年

作者： Shi, Zhangyong Yan, Dingyu Zhang, Yanchao Zhang, Fan Chen, Yimin Gu, Chenjie Chen, Xiren Shao, Jun Wang, Shumin Shen, Xiang Laboratory of Infrared Materials and Devices Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Research Institute of Advanced Technology Ningbo University Ningbo315211 China Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo315211 China Zhejiang Supermat Sen-Ray Optoelectronics Co. Ltd. Ningbo315400 China Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg41296 Sweden State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China

The imaging performance of infrared focal plane array (FPA) is largely limited by the non-uniformity of in-plane photoelectric response of InAs/GaSb type II superlattices (T2SL) consisting of a new hundred or more thin layers. Fundamentally, the non-uniformity results from the materials property variation as well as process fluctuations over the area of centimeter square. Thus, in order to improve the imaging performance of an FPA detector, it is necessary to accurately detect and evaluate the influence of materials and processes on the uniformity of internal photoelectric response. In this work, the spatially resolved photoluminescence (PL) was implemented to detect the micro-scale mesa pixels, and the effects of materials and processes on the photoelectric uniformity within the plane were studied for the first time. And the modulated PL-mapping technology based on step scanning Fourier transform infrared (ssFTIR) spectrometer is used to extract parameters from each test spectrum, such as PL peak energy, linewidth, integral intensity, and then they are analyzed in the form of two-dimensional spatial mapping. The result shows that the variation of T2SL material properties accounts for 29% of the non-uniformity, and the rest 71% results from the process fluctuation. Especially, the etching process has a great influence on the uniformity. It reveals that the non-uniformity of the integral intensity of the sample after etching is increased by 2.44 times compared with that before the etching. Thereafter, a layer of SiO2 film was deposited to passivate the surface, it shows that the non-uniformity returns to the level before the etching, which directly proves that the passivation process can improve the photoelectric response uniformity of the infrared FPA detector. © 2022, The Authors. All rights reserved.

关键词： Etching

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Minute-cadence observations on Galactic plane with Wide Field Survey Telescope (WFST): Overview, methodology and early results

arXiv

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arXiv 2024年

作者： Lin, Jie Wang, Tinggui Cai, Minxuan Wan, Zhen Li, Xuzhi Fan, Lulu Zhu, Qingfeng Jiang, Ji-An Jiang, Ning Kong, Xu Lin, Zheyu Zhu, Jiazheng Liu, Zhengyan Gao, Jie Li, Bin Li, Feng Liang, Ming Liu, Hao Liu, Wei Luo, Wentao Tang, Jinlong Wang, Hairen Wang, Jian Xue, Yongquan Yao, Dazhi Zhang, Hongfei Zhang, Xiaoling Zhao, Wen Zheng, Xianzhong Department of Astronomy University of Science and Technology of China Hefei230026 China School of Astronomy and Space Science University of Science and Technology of China Hefei230026 China Deep Space Exploration Laboratory Hefei230088 China School of Mathematics and Physics Anqing Normal University Anqing246133 China Institute of Astronomy and Astrophysics Anqing Normal University Anqing246133 China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China National Optical Astronomy Observatory NSF’s National Optical-Infrared Astronomy Research Laboratory 950 N Cherry Ave. TucsonAZ85726 United States Institute of Optics and Electronics Chinese Academy of Sciences Chengdu610209 China

As the time-domain survey telescope of the highest survey power in the northern hemisphere currently, Wide Field Survey Telescope (WFST) is scheduled to hourly/daily/semi-weekly scan northern sky up to ∼ 23 mag in four optical (ugri) bands. Unlike the observation cadences in the forthcoming regular survey missions, WFST performed "staring" observations toward Galactic plane in a cadence of ≈ 1 minute for a total on-source time of about 13 hours, during the commissioning and pilot observation phases. Such an observation cadence is well applied in producing densely sampling light curves and hunting for stars exhibiting fast stellar variabilities. Here we introduce the primary methodologies in detecting variability, periodicity, and stellar flares among a half million sources from the minute-cadence observations, and present the WFST g-/r-band light curves generated from periodic variable stars and flaring stars. Benefit from high photometric precisions and deep detection limits of WFST, the observations have captured several rare variable stars, such as a variable hot white dwarf (WD) and an ellipsoidal WD binary candidate. By surveying the almost unexplored parameter spaces for variables, WFST will lead to new opportunities in discovering unique variable stars in the northern sky. Copyright © 2024, The Authors. All rights reserved.

关键词： Surveying

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Reconfigurable terahertz optoelectronic logic through charge-density-wave phase engineering

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Nature Communications 2025年第1期16卷 1-10页

作者： Sun, Xin Xiao, Kening Wei, Yingdong Mo, Wenqi Zhang, Libo Tian, Shijian Pan, Xiaokai Yang, Yage Lan, Shiqi Zhang, Yichong Hu, Zhen Zhang, Kaixuan Han, Li Wang, Fang Chen, Xiaoshuang Wang, Lin Hu, Weida State Key Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai China School of Microelectronics Shanghai University Shanghai China College of Physics and Optoelectronic Engineering Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou China School of Physical Science and Technology ShanghaiTech University Shanghai China College of Optical and Electronic Technology China Jiliang University Hangzhou China

Charge density waves, manifestations of strongly correlated electronic states in low-dimensional materials, exhibit collective quantum phenomena that enable phase-coherent electronic manipulation. Conventional approaches face limitations in integrating sensing and computing functions, particularly at terahertz frequencies where traditional semiconductors struggle. We achieve deterministic switching between resistive and dissipationless states in 1T-TaS₂ through synergistic thermal, electrical, and optical modulation of metastable charge-density-wave configurations. The resulting photoconversion mechanism delivers 5.49 A/W responsivity with 1.7 μs response time at 0.29 THz. Resonant terahertz excitation couples to collective modes, triggering lattice distortion via nonlinear phononic interactions that collectively reduce phase transition barriers in pre-biased devices. Thermally mediated state retention enables reconfigurable integration of sensing, logic, and memory functions, while phase stability under multi-field control demonstrates the feasibility of a terahertz optoelectronic platform for secure communications and programmable computing with in-memory processing capabilities. © The Author(s) 2025.

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Hole-dominated Fowler–Nordheim tunneling in 2D heterojunctions for infrared imaging

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science Bulletin 2021年第2期66卷 139-146,M0004页

作者： Lei Tong Meng Peng Peisong Wu Xinyu Huang Zheng Li Zhuiri Peng Runfeng Lin Qiaodong Sun Yaxi Shen Xuefeng Zhu Peng Wang Jianbin Xu Lei Ye School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Department of Electronic Engineering Materials Science and Technology Research CenterThe Chinese University of Hong KongHong KongChina

Heterostructures based on diverse two-dimensional(2D)materials are effective for tailoring and further promoting device performance and exhibit considerable potential in ***,the problem of high-density thermionic carriers can be hardly overcome in most reported heterostructure devices based on type I and type II band alignment,which leads to an unacceptably small Iphoto/Idark and strong temperature dependence that limit the performance of ***,using the MoTe_(2)/h-BN/MoTe_(2)/h-BN heterostructure,we report the hole-dominated Fowler–Nordheim quantum tunneling transport in both on and off *** state-of-the-art device operating at room temperature shows high detectivity of>10^(8) Jones at a laser power density of<0.3 nW μm^(-2) from the visible to near infrared *** addition,the fast on–off switching and highly sensitive photodetection properties promise superior imaging *** tunneling mechanism,in combination with other unique properties of 2D materials,is significant for novel photodetection.

关键词： MoTe2 Fowler–Nordheim quantum tunneling Response speed Photodetection High detectivity

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Analysis of Internal Atmosphere of InGaAs detectors with Different Degassing Conditions

Analysis of Internal Atmosphere of InGaAs Detectors with Dif...

引用

System Reliability and Safety Engineering (SRSE), International Conference on

作者： Canxiong Lai Wen Sun Shaohua Yang Bin Zhou Science and Technology on Reliability Physics and Application of Electronic Component Laboratory CEPREI Guangzhou China Key Laboratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical Physics Shanghai China

ISBN: (纸本)9781665401616

the internal atmosphere composition of the cavity package of InGaAs detector has an important impact on its reliability. In this paper, the internal atmosphere contents of the detectors prepared at different degassing conditions are analyzed. The results show that vacuum baking at a relatively low temperature such as 45°C can reach an acceptable internal atmosphere level. Higher baking temperature °fif ((db further reduce the moisture content to about 1000ppmv, which would make the detector more reliable for long-term operation and thus be an ideal choice for degassing. Besides vacuum baking, the degassing effectiveness of nitrogen gas washing is also confirmed to be acceptable, although the moisture and oxygen contents are higher than those of vacuum baking.

关键词： Vacuum systems Atmosphere Moisture detectors Reliability engineering Indium gallium arsenide Temperature control

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