2024
2024
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Record 517 of
Title:Methodology and Modeling of UAV Push-Broom Hyperspectral BRDF Observation Considering Illumination Correction
Author Full Names:Wang, Zhuo(1,2); Li, Haiwei(1); Wang, Shuang(1,3); Song, Liyao(4); Chen, Junyu(1)Source Title:Remote SensingLanguage:EnglishDocument Type:Journal article (JA)Abstract:The Bidirectional Reflectance Distribution Function (BRDF) is a critical spatial distribution parameter in the quantitative research of remote sensing and has a wide range of applications in radiometric correction, elemental inversion, and surface feature estimation. As a new means of BRDF modeling, UAV push-broom hyperspectral imaging is limited by the push-broom imaging method, and the multi-angle information is often difficult to obtain. In addition, the random variation of solar illumination during UAV low-altitude flight makes the irradiance between different push-broom hyperspectral rows and different airstrips inconsistent, which significantly affects the radiometric consistency of BRDF modeling and results in the difficulty of accurately portraying the three-dimensional spatial reflectance distribution in the UAV model. These problems largely impede the application of outdoor BRDF. Based on this, this paper proposes a fast multi-angle information acquisition scheme with a high-accuracy BRDF modeling method considering illumination variations, which mainly involves a lightweight system for BRDF acquisition and three improved BRDF models considering illumination corrections. We adopt multi-rectangular nested flight paths for multi-gray level targets, use multi-mode equipment to acquire spatial illumination changes and multi-angle reflectivity information in real-time, and introduce the illumination correction factor K through data coupling to improve the kernel, Hapke, and RPV models, and, overall, the accuracy of the improved model is increased by 20.83%, 11.11%, and 31.48%, respectively. The results show that our proposed method can acquire multi-angle information quickly and accurately using push-broom hyperspectral imaging, and the improved model eliminates the negative effect of illumination on BRDF modeling. This work is vital for expanding the multi-angle information acquisition pathway and high-efficiency and high-precision outdoor BRDF modeling. ? 2024 by the authors.Affiliations:(1) Key Laboratory of Spectral Imaging Technology of CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Shaanxi Key Laboratory of Optical Remote Sensing and Intelligent Information Processing, Xi’an; 710100, China; (4) Institute of Artificial Intelligence and Data Science, Xi’an Technological University, Xi’an; 710021, ChinaPublication Year:2024Volume:16Issue:3Article Number:543DOI Link:10.3390/rs16030543數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20240715549174 -
Record 518 of
Title:Computational imaging-based single-lens imaging systems and performance evaluation
Author Full Names:Wei, Shijie(1); Cheng, Huachao(1,2); Xue, Ben(1,2); Yang, Xihang(1); Ma, Yinpeng(1,3); Wang, Yue(1); Xi, Teli(1,2); Shao, Xiaopeng(4)Source Title:Optics ExpressLanguage:EnglishDocument Type:Journal article (JA)Abstract:The minimalist optical system has a simple structure, small size, and lightweight, but the low optical complexity will produce optical aberration. Addressing the significant aberration degradation in minimalist systems, we propose a high-quality computational optical framework. This framework integrates a global point spread function (PSF) change imaging model with a transformer-based U-Net deep learning algorithm to achieve high-quality imaging in minimalist systems. Additionally, we introduce an imaging performance evaluation method based on the modulation transfer degree of resolution (MTR). We addressed severe chromatic and spherical aberrations in single-lens systems, a typical example of minimalist optical systems, by simulating the degradation process and reconstructing the imaging effects. This approach demonstrated significant improvements, thus validating the feasibility of our method. Specifically, our technique calculated the MTR values in real images captured with the GCL010109 single lens at 0.8085, and with the GCL010110 single lens at 0.8055. Our method enhanced the imaging performance of minimalist systems by 4 times, upgrading minimalist system capabilities from poor to good lens grade. This work can provide reference for wavefront coding, matelens, diffraction optical systems, and other computational imaging work. It can also promote the application of miniaturization of medical, aerospace, and head-mounted optical systems. ? 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.Affiliations:(1) Xi’an Key Laboratory of Computational Imaging, School of Optoelectronic Engineering, Xidian University, Xi’an; 710071, China; (2) Guangzhou Institute of Technology, Xidian University, Guangzhou; 510555, China; (3) Advanced Optoelectronic Imaging and Device Laboratory, Hangzhou Institute of Technology, Xidian University, Hangzhou; 311200, China; (4) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, No.17 Xinxi Road, Xi’an; 710119, ChinaPublication Year:2024Volume:32Issue:15Start Page:26107-26123DOI Link:10.1364/OE.527950數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20243016735186 -
Record 519 of
Title:A Survey on Vision-Based Anti Unmanned Aerial Vehicles Methods
Author Full Names:Wang, Bingshu(1,2); Li, Qiang(1); Mao, Qianchen(1); Wang, Jinbao(2); Chen, C. L. Philip(3,4); Shangguan, Aihong(5); Zhang, Haosu(5)Source Title:DronesLanguage:EnglishDocument Type:Journal article (JA)Abstract:The rapid development and widespread application of Unmanned Aerial Vehicles (UAV) have raised significant concerns about safety and privacy, thus requiring powerful anti-UAV systems. This survey provides an overview of anti-UAV detection and tracking methods in recent years. Firstly, we emphasize the key challenges of existing anti-UAV and delve into various detection and tracking methods. It is noteworthy that our study emphasizes the shift toward deep learning to enhance detection accuracy and tracking performance. Secondly, the survey organizes some public datasets, provides effective links, and discusses the characteristics and limitations of each dataset. Next, by analyzing current research trends, we have identified key areas of innovation, including the progress of deep learning techniques in real-time detection and tracking, multi-sensor fusion systems, and the automatic switching mechanisms that adapt to different conditions. Finally, this survey discusses the limitations and future research directions. This paper aims to deepen the understanding of innovations in anti-UAV detection and tracking methods. Hopefully our work can offer a valuable resource for researchers and practitioners involved in anti-UAV research. ? 2024 by the authors.Affiliations:(1) The School of Software, Northwestern Polytechnical University, Xi’an; 710129, China; (2) National Engineering Laboratory for Big Data System Computing Technology, Shenzhen University, Shenzhen; 518060, China; (3) The School of Computer Science and Engineering, South China University of Technology, Guangzhou; 510641, China; (4) Pazhou Lab, Guangzhou; 510335, China; (5) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, ChinaPublication Year:2024Volume:8Issue:9Article Number:518DOI Link:10.3390/drones8090518數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20244017127840 -
Record 520 of
Title:Optomechanical design analysis and development of space-based visible coded spectrometer based on curved prism dispersion
Author Full Names:Jia, Xinyin(1); Wang, Feicheng(1); Liu, Jia(1,2,3,4); Zhang, Zhanghui(1); Li, Siyuan(1); Yang, Ying(1); Hu, Bingliang(1); He, Xianqiang(2); Liu, Yupeng(3)Source Title:Journal of Optics (India)Language:EnglishDocument Type:Journal article (JA)Abstract:The coded spectrometer, a relatively new instrument, has the advantage of high signal-to-noise ratio, giving it great application potential. We report the optical design of a space-based visible coded spectrometer based on curved prism dispersion (SVCS-CPD) and further explore the design and analysis of its support structure. A static simulation and modal analysis, sinusoidal vibration mechanical analysis, and random vibration mechanical analysis were performed to demonstrate the excellent mechanical and thermal stability of the support structure. To realize rapid assembly and integration of the off-axis optical system, a point source microscope and three-coordinate measuring machines were employed. In addition, tests of optical design parameters and outdoor push-scan imaging were conducted to validate the high imaging performance of the SVCS-CPD. The results showed that the modulation transfer functions of the SVCS-CPD in the central and marginal fields of view were 0.61 at 31.25 line pairs/mm and 0.53 at 31.25 line pairs/mm, respectively. In addition, the spectral smile and spectral keystone were ? The Author(s), under exclusive licence to The Optical Society of India 2023.Affiliations:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China; (3) State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; (4) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024Volume:53Issue:4Start Page:3519-3533DOI Link:10.1007/s12596-023-01544-9數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20235215294376 -
Record 521 of
Title:Room-temperature MoTe2/InSb heterostructure large-area terahertz detector
Author Full Names:Wang, Jiatong(1); Zhang, Min(1,3); Zhou, Zhiwen(1); Li, Ling(1); Song, Qi(2); Yan, Peiguang(1)Source Title:Infrared Physics and TechnologyLanguage:EnglishDocument Type:Journal article (JA)Abstract:As a building block for terahertz system, terahertz detector is expected to achieve high-performance, room-temperature, low-cost and large-area detection available. However, the state-of-the-art technologies still suffer from various drawbacks. This paper presents a MoTe2/InSb heterostructure large-area terahertz detector. With the photoactive region of heterostructure, carriers are allowed to assemble within the interface due to the carrier mobility difference, resulting in detection sensitivity improvement. The structures and bonding of MoTe2/InSb heterostructure were characterized by Raman spectroscopy. Besides, large-scale interdigital electrodes with subwavelength spacing are employed at the bottom of photoactive region, which contrasts with normal electrodes coated on both sides of the active layer, endowing a large effective detection area of 2 mm × 6.65 mm with the detector. Subwavelength electrodes spacing not only facilitates the directional migration of carriers, but also induces electromagnetic induced well (EIW) effects to obtain extraordinary performance. As a result, the detector achieves a noise equivalent power (NEP) of 2.66 pW Hz-1/2 and a detectivity (D*) of 0.53 × 1012 cm Hz1/2 W?1 under 0.1 THz radiation at room temperature. The proposed high-performance terahertz detector exhibits remarkable prospects in varieties of applications. ? 2024 The Author(s)Affiliations:(1) Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, State Key Laboratory of Radio Frequency Heterogeneous Integration, Shenzhen University, Shenzhen; 518060, China; (2) School of Physics Science and Information Technology, Liaocheng University, Liaocheng; 252059, China; (3) The State Key Laboratory of Transient Optics and Photonics, Xi'an; 710119, ChinaPublication Year:2024Volume:137Article Number:105190DOI Link:10.1016/j.infrared.2024.105190數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20240615520725 -
Record 522 of
Title:Biomimetic Curved Artificial Compound Eyes: A Review
Author Full Names:Jiang, Heng(1,2); Tsoi, Chi Chung(1,2); Sun, Lanrui(1,2); Yu, Weixing(3); Fan, Hao(3); Ma, Mengchao(4); Jia, Yanwei(5); Zhang, Xuming(1,2)Source Title:Advanced Devices and InstrumentationLanguage:EnglishDocument Type:Journal article (JA)Abstract:Natural compound eyes (NCEs) are the most abundant and successful eye designs in the animal kingdom. An NCE consists of a number of ommatidia, which are distributed along a curved surface to receive light. This curved feature is critical to the functions of NCE, and it ensures that different ommatidia point to slightly different directions and thus enables panoramic vision, depth perception, and efficient motion tracking while minimizing aberration. Consequently, biomimetic curved artificial compound eyes (BCACEs) have garnered substantial research attention in replicating the anatomical configuration of their natural counterparts by distributing ommatidia across a curved surface. The reported BCACEs could be briefly categorized into 2 groups: fixed focal lengths and tunable focal lengths. The former could be further subcategorized into simplified BCACEs, BCACEs with photodetector arrays within curved surfaces, and BCACEs with light guides. The latter encompasses other tuning techniques such as fluidic pressure modulation, thermal effects, and pH adjustments. This work starts with a simple classification of NCEs and then provides a comprehensive review of main parameters, operational mechanisms, recent advancements, fabrication methodologies, and potential applications of BCACEs. Finally, discussions are provided on future research and development. Compared with other available review articles on artificial compound eyes, our work is distinctive since we focus especially on the "curved" ones, which are difficult to fabricate but closely resemble the architecture and functions of NCEs, and could potentially revolutionize the imaging systems in surveillance, machine vision, and unmanned vehicles. Copyright ? 2024 Heng Jiang et al.Affiliations:(1) Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong; (2) Photonics Research Institute, The Hong Kong Polytechnic University, Hong Kong; (3) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (4) Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology, Hefei, China; (5) State Key Laboratory of Analog and Mixed Signal VLSI, Institute of Microelectronics, University of Macau, ChinaPublication Year:2024Volume:5Article Number:0034DOI Link:10.34133/adi.0034數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20243016763510 -
Record 523 of
Title:Sensitivity Analysis of Greenhouse Gas Detection System Based on Array Fabry-Pérot Interferometer
Author Full Names:Yu, Miao(1,2); Fu, Di(1); Zhang, Qiang(1,2); Wang, Sufeng(1); Wen, Zhenqing(1,2); Liu, Changhai(3); Wang, Yungang(4); Li, Jing(4); Feng, Yutao(1)Source Title:Guangxue Xuebao/Acta Optica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:Objective In response to the urgent demand for high-precision global greenhouse gas (GHG) emissions monitoring, essential for carbon inventories and enforcement, achieving low-cost, high-resolution detection has become a key research focus. The array Fabry-Pérot (F-P) spectrometer, with its compact structure, lack of moving parts, and ability to account for both the sampling density and range of optical path differences, presents an effective solution for achieving accurate and cost-efficient GHG detection. The parameters of the array F-P interferometer are critical to the system’s optical performance and directly affect detection accuracy. To establish optimal detection parameters, we explore the effects of variables such as F-P interval thickness, interferometric cavity reflectivity, F-P quantity, and adjacent F-P optical path difference sampling interval on system sensitivity. By analyzing the variation in integral sensitivity with changes in GHG volume fraction, we determine the optimal parameters for spectrometer design, providing a theoretical foundation for further research on array F-P spectrometers for GHG detection. Methods Using the upwelling radiance spectra of GHGs at varying concentrations as input, we propose a simulation model for raw interferometric data from the array F-P spectrometer. The influence of spectrometer parameters on system detection sensitivity is analyzed using this model. To maximize integral sensitivity, the analysis focuses on how varying the thickness of the F-P intervals affects integral sensitivity and determines the optimal thickness of the F-P plates. To achieve maximum normalized sensitivity for the detection system, the relationship between signal-to-noise ratio (SNR), spectral resolution, detection sensitivity, and interferometric cavity reflectivity is analyzed, confirming the optimal reflectivity value. In addition, the effect of the number of F-P cavities and the adjacent F-P optical path difference sampling interval on integral sensitivity is evaluated. Results and Discussions This analysis quantitatively evaluates how integral sensitivity varies with F-P interval thickness, cavity reflectivity, F-P numbers, and the sampling interval of the adjacent F-P optical path difference. Specific parameters are confirmed for both carbon dioxide and methane detection systems. To thoroughly assess the influence of interferometric cavity reflectivity on SNR and detection sensitivity, the normalized sensitivity for various reflectivities is simulated (Fig. 12). For both the carbon dioxide and methane systems, normalized sensitivity exceeds 0.98 at reflectivities between 0.35 to 0.49 and 0.39 to 0.50, respectively, with optimal values observed around 0.42 and 0.47. The influence of F-P numbers on integral sensitivity is shown (Fig. 14). As the number of cavities increases, the sampling range of the optical path difference increases linearly, leading to a corresponding increase in integral sensitivity. The influence of the adjacent F-P optical path difference sampling interval on both the sampling range and integral sensitivity is simulated (Fig. 17). As the adjacent F-P optical path difference sampling interval decreases, the overall optical range decreases; however, both the sampling density of the interferometric signal and the integral sensitivity increase. When the adjacent F-P optical path difference sampling interval is reduced to λ/4 or less, further reductions have minimal effect on integral sensitivity. Conclusions In this paper, we introduce the fundamental principles of the array F-P spectrometer and its application in GHG detection. By analyzing the magnitude of the Fourier expansion term coefficients in relation to variations in the reflectivity of the interfering cavity, we confirm that the reflectivity of the F-P flat plate approximation for double-beam interferometry falls within the range of 0.3 to 0.7. A raw data simulation model for the array F-P interferometer is developed using the upwelling radiance spectra of greenhouse gases with varying concentrations as a system input. Based on this model, we conduct a simulation analysis to assess the effects of F-P spectrometer parameters on detection sensitivity, defining the guiding principle for parameter selection and determining their optimal values. The simulation results indicate that the interferometric cavity reflectivity for the carbon dioxide and methane systems are 0.42 and 0.47, respectively, at which point the system’s normalized sensitivity reaches its maximum. The integral sensitivity of the detection system is positively correlated with the number of F-P cavities. When the adjacent F-P optical path difference sampling interval is set to a quarter-wavelength, the system achieves high integral sensitivity and a broad optical path difference. ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanic, Chinese Academy of Sciences, Shaanxi, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Ｂeijing; 100049, China; (3) People’s Liberation Army of China, 63853 Troops, Shaanxi, Xi’an; 710200, China; (4) Key Laboratory of Space Weather, National Satellite Meteorological Center, National Center for Space Weather, China Meteorological Administration, Ｂeijing; 100081, ChinaPublication Year:2024Volume:44Issue:24Article Number:2412003DOI Link:10.3788/AOS240833數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20245217587831 -
Record 524 of
Title:Repetition rate tuning and locking of solitons in a microrod resonator
Author Full Names:Niu, Rui(1,2); Wan, Shuai(1,2); Sun, Shu-Man(1,2); Ma, Tai-Gao(1,2); Chen, Hao-Jing(1,2); Wang, Wei-Qiang(3,4); Lu, Zhizhou(3,4); Zhang, Wen-Fu(3,4); Guo, Guang-Can(1,2); Zou, Chang-Ling(1,2); Dong, Chun-Hua(1,2)Source Title:Optics LettersLanguage:EnglishDocument Type:Journal article (JA)Abstract:Recently, there has been significant interest in the generation of coherent temporal solitons in optical microresonators. In this Letter, we present a demonstration of dissipative Kerr soliton generation in a microrod resonator using an auxiliary-laser-assisted thermal response control method. In addition, we are able to control the repetition rate of the soliton over a range of 200 kHz while maintaining the pump laser frequency, by applying external stress tuning. Through the precise control of the PZT voltage, we achieve a stability level of 3.9 × 10?10 for residual fluctuation of the repetition rate when averaged 1 s. Our platform offers precise tuning and locking capabilities for the repetition frequency of coherent mode-locked combs in microresonators. This advancement holds great potential for applications in spectroscopy and precision measurements. ? 2024 Optica Publishing Group.Affiliations:(1) Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Anhui, Hefei; 230026, China; (2) CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Anhui, Hefei; 230026, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), CAS, Xi’an; 710119, China; (4) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024Volume:49Issue:3Start Page:570-573DOI Link:10.1364/OL.511339數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20240615521839 -
Record 525 of
Title:Attention Network with Outdoor Illumination Variation Prior for Spectral Reconstruction from RGB Images
Author Full Names:Song, Liyao(1); Li, Haiwei(2); Liu, Song(3); Chen, Junyu(2); Fan, Jiancun(4); Wang, Quan(2); Chanussot, Jocelyn(5)Source Title:Remote SensingLanguage:EnglishDocument Type:Journal article (JA)Abstract:Hyperspectral images (HSIs) are widely used to identify and characterize objects in scenes of interest, but they are associated with high acquisition costs and low spatial resolutions. With the development of deep learning, HSI reconstruction from low-cost and high-spatial-resolution RGB images has attracted widespread attention. It is an inexpensive way to obtain HSIs via the spectral reconstruction (SR) of RGB data. However, due to a lack of consideration of outdoor solar illumination variation in existing reconstruction methods, the accuracy of outdoor SR remains limited. In this paper, we present an attention neural network based on an adaptive weighted attention network (AWAN), which considers outdoor solar illumination variation by prior illumination information being introduced into the network through a basic 2D block. To verify our network, we conduct experiments on our Variational Illumination Hyperspectral (VIHS) dataset, which is composed of natural HSIs and corresponding RGB and illumination data. The raw HSIs are taken on a portable HS camera, and RGB images are resampled directly from the corresponding HSIs, which are not affected by illumination under CIE-1964 Standard Illuminant. Illumination data are acquired with an outdoor illumination measuring device (IMD). Compared to other methods and the reconstructed results not considering solar illumination variation, our reconstruction results have higher accuracy and perform well in similarity evaluations and classifications using supervised and unsupervised methods. ? 2023 by the authors.Affiliations:(1) Institute of Artificial Intelligence and Data Science, Xi’an Technological University, Xi’an; 710021, China; (2) Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an; 710119, China; (3) School of Measuring and Optical Engineering, Nanchang Hangkong University, Nanchang; 330063, China; (4) School of Information and Communications Engineering, Xi’an Jiaotong University, Xi’an; 710049, China; (5) GIPSA-Lab, CNRS, Grenoble INP, Université Grenoble Alpes, Grenoble; 38000, FrancePublication Year:2024Volume:16Issue:1Article Number:180DOI Link:10.3390/rs16010180數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20240315384638 -
Record 526 of
Title:Advanced Applications of Kerr Micro-combs
Author Full Names:Wu, Jiayang(1); Sun, Yang(1); Li, Yang(1); Tan, Mengxi(2); Xu, Xingyuan(3); Chu, Sai T.(4); Little, Brent E.(5); Morandotti, Roberto(6); Mitchell, Arnan(7); Moss, David J.(1)Source Title:Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024 in Proceedings 2024 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)Language:EnglishDocument Type:Conference article (CA)Conference Title:2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024Conference Date:August 4, 2024 - August 8, 2024Conference Location:Incheon, Korea, Republic ofAbstract:We review our work on advanced applications of optical Kerr frequency microcombs, including an optical convolutional accelerator operating at 11 Tera-OPS. ? 2024 The Author(s)Affiliations:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC, Australia; (2) School of Electronic and Information Engineering, Beihang University, Beijing; 100191, China; (3) State Key Lab. of Information Photonics and Optical Communications, Beijing U. of Posts and Telecommunications, Beijing; 100876, China; (4) Department of Physics, City University of Hong Kong, Hong Kong; (5) Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of CAS, Xi'an, China; (6) INRS-énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC, Canada; (7) School of Engineering, RMIT University, Melbourne; VIC, AustraliaPublication Year:2024數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20250517777095 -
Record 527 of
Title:Metastable patterns in one- and two-component dipolar Bose-Einstein condensates
Author Full Names:Zhang, Yong-Chang(1); Pohl, Thomas(2); Maucher, Fabian(3,4)Source Title:Physical Review ResearchLanguage:EnglishDocument Type:Journal article (JA)Abstract:In this paper we study metastable states in single- and two-component dipolar Bose-Einstein condensates. We show that this system supports a rich variety of states that are remarkably stable despite not being ground states. In a parameter region where striped phases are ground states, we find such metastable states that are energetically favorable compared to triangular and honeycomb lattices. Among these metastable states we report a peculiar ring-lattice state, which is led by the competition between triangular and honeycomb symmetries and rarely seen in other systems. In the case of dipolar mixtures we show that via tuning the miscibility these states can be stabilized in a broader domain by utilizing interspecies interactions. ? 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Affiliations:(1) MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Key Laboratory of Quantum Information and Quantum Optoelectronic Devices, School of Physics, Xi'An Jiaotong University, Xi'an; 710049, China; (2) Institute for Theoretical Physics, Vienna University of Technology (TU Wien), Vienna; 1040, Austria; (3) Faculty of Mechanical, Maritime and Materials Engineering, Department of Precision and Microsystems Engineering, Delft University of Technology, Delft; 2628 CD, Netherlands; (4) Departament de Física, Universitat de les Illes Balears and IAC-3, Campus UIB, Palma de Mallorca; E-07122, SpainPublication Year:2024Volume:6Issue:2Article Number:023023DOI Link:10.1103/PhysRevResearch.6.023023數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20241515881856 -
Record 528 of
Title:2.8 μm gain-switched erbium-doped fluoride fiber laser pumped at 1.7 μm
Author Full Names:Xiao, Yang(1,2); He, Yuxuan(3); Shen, Yewei(3); Yin, Tiantian(4); Liang, Wentao(1,2); Xiao, Xusheng(1,2); Guo, Haitao(1,2)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:2024 Applied Optics and Photonics China: Laser Technology and Applications, AOPC 2024Conference Date:July 23, 2024 - July 26, 2024Conference Location:Beijing, ChinaConference Sponsor:Chinese Society for Optical Engineering (CSOE)Abstract:Gain-switched mid-infrared 1 and 7 mol. % erbium-doped fluoride fiber lasers pumped at 1.7 μm were demonstrated. They delivered 2.8 μm pulsed laser with maximum average powers of 306 mW and 390 mW, respectively, corresponding to recorded laser efficiencies of 43.6% and 35.5%. This work exhibits the potential of the 1.7 μm pulsed pumping scheme for gain-switched 2.8 μm erbium-doped fluoride fiber lasers and this pumping scheme paves the way for high-efficient pulsed fiber lasers in the 3 μm region. ? 2024 SPIE.Affiliations:(1) The State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) Center for Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao; 266500, China; (4) Department of Mining and Materials Engineering, McGill University, Montreal; H3A 0C5, CanadaPublication Year:2024Volume:13492Article Number:1349212DOI Link:10.1117/12.3047826數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20250117638478