2024
2024
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Record 313 of
Title:Spectral domain characteristics of partially coherent illumination on grating imaging system
Author Full Names:Jing, Xinyi(1); Hu, Xiaoying(1); Xu, Liang(2); Liu, Weiguo(1); Hanson, Steen G.(3); Takeda, Mitsuo(1,4); Wang, Wei(1,5)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:8th International Conference on Speckle Metrology, Speckle 2023Conference Date:October 18, 2023 - October 20, 2023Conference Location:Xi'an, ChinaConference Sponsor:Changchun Institute of Optics, Fine Mechanics, and Physics; Wuhan Red Star Yang Science and Technology Co., Ltd.; Xi'an Micromach Technology Co., Ltd.; Xi'an Startin Optronics Co., Ltd.Abstract:The grating imaging system has the advantages of high resolution, high sensitivity and strong anti-interference ability, and has been widely used in machine vision, biomedicine and imaging spectroscopy and other fields. The coherence and polarization properties of the light field have different effects on the grating imaging system. This paper studies the polarization system of the grating illuminated by partially coherent light based on the unified theory of polarization and coherence. The experiment is carried out using a sinusoidal amplitude grating of 20 lines per mm. The experimental results show that when the coherence is fixed, as the normalized intrinsic frequency of the grating increases, the second harmonic disappears, leaving only the direct current (DC) component and the first harmonic component, which is consistent with the theoretical result. ? COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.Affiliations:(1) School of Optoelectronic Engineering, Xi an Technological University, Shaanxi, Xi'an; 710032, China; (2) Xi an Institute of Optics and Precision Mechanics, Cas, Shaanxi, Xi'an; 710119, China; (3) Dtu Fotonik, Roskilde; Dk-4000, Denmark; (4) Center for Optical Research and Education (CORE), Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi; 321-8585, Japan; (5) School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh; EH14 4AS, United KingdomPublication Year:2024Volume:13070Article Number:1307002DOI Link:10.1117/12.3013409數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20241315797429 -
Record 314 of
Title:Robust internal model control based on a novel generalized extended state observer and its application on a two-inertia system
Author Full Names:Wang, Fan(1,2); Cheng, Tianji(3,4,5); Jing, Feng(1,2); Liu, Peng(1,2); Xie, Meilin(1,2); Cao, Yu(1,2); Guo, Min(1,2)Source Title:ISA TransactionsLanguage:EnglishDocument Type:Journal article (JA)Abstract:Disturbance observer (DOB) and extended state observer (ESO) are extensively utilized to handle external disturbances and model uncertainties in the control system. Nevertheless, the integration of these two methods to improve disturbance suppression remains an open question. In this research, the disturbance compensation mechanism of DOB is employed to compensate the disturbance estimation error of ESO, thereby achieving an effective integration of DOB and ESO. Additionally, a generalized ESO (GESO) is proposed to replace ESO. A robust internal mode control (RIMC) scheme is then developed by incorporating GESO into a two-degree-of-freedom internal mode control (TDF-IMC) framework. Moreover, the equivalence of RIMC and classical TDF-IMC is given by a rigorous derivation under the frequency domain description. Finally, the RIMC is applied to the control of a two-inertia system to verify its superiority in terms of robustness, disturbance rejection, and resonance suppression. ? 2024 ISAAffiliations:(1) Xi'an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Key Laboratory of Space Precision Measurement, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China; (4) University of Chinese Academy of Sciences, Beijing; 100149, China; (5) Key Laboratory of Science and Technology on Space Optoelectronic Precision Measurement, Chinese Academy of Sciences, Chengdu; 610209, ChinaPublication Year:2024Volume:152Start Page:439-452DOI Link:10.1016/j.isatra.2024.07.005數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20242816684078 -
Record 315 of
Title:Atomistic Evidence of Nucleation Mechanism for the Direct Graphite-to-Diamond Transformation
Author Full Names:Luo, Duan(1); Yang, Liuxiang(2); Xie, Hongxian(3); Srinivasan, Srilok(1); Tian, Jinshou(4); Sankaranarayanan, Subramanian(1); Arslan, Ilke(1); Yang, Wenge(2); Mao, Ho-Kwang(2,5); Wen, Jianguo(1)Source Title:SSRNLanguage:EnglishDocument Type:Preprint (PP)Abstract:The direct graphite-to-diamond transformation mechanism has been a subject of intense study and remains debated concerning the initial stages of the conversion, the intermediate phases, and their transformation pathways. Here, we successfully recover samples at the early conversion stage by tuning high-pressure/high-temperature conditions and reveal direct evidence supporting the nucleation-growth mechanism. Atomistic observations show that intermediate orthorhombic graphite phase mediates the growth of diamond nuclei. Furthermore, we observe that quenchable orthorhombic and rhombohedra graphite are stabilized in buckled graphite at lower temperatures. These intermediate phases are further converted into hexagonal and cubic diamond at higher temperatures following energetically favorable pathways in the order: graphite → orthorhombic graphite → hexagonal diamond, graphite → orthorhombic graphite → cubic diamond, graphite → rhombohedra graphite → cubic diamond. These results significantly improve our understanding of the transformation mechanism, enabling the synthesis of different high-quality forms of diamond from graphite. ? 2024, The Authors. All rights reserved.Affiliations:(1) Center for Nanoscale Materials, Argonne National Laboratory, Lemont; IL; 60439, United States; (2) Center for High Pressure Science and Technology Advanced Research, Beijing; 100094, China; (3) Hebei University of Technology, Tianjin; 300132, China; (4) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'An; 710119, China; (5) Geophysical Laboratory, Carnegie Institution of Washington, Washington; DC; 20015, United StatesPublication Year:2024DOI Link:10.2139/ssrn.4843694數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20240218941 -
Record 316 of
Title:Bulk Damage Growth Characteristics and Ultra-Fast Diagnosis of Fluoride-Containing Phosphate Glasses Induced by 355 Nm Laser
Author Full Names:Li, Shengwu(1,2); Jiang, Yong(3,4); Wan, Rui(1); Wang, Pengfei(1)Source Title:SSRNLanguage:EnglishDocument Type:Preprint (PP)Abstract:To comprehensively reveal the influence regularity of different glass melting temperatures on the UV laser-induced damage resistance of fluoride-containing phosphate glasses, the initial bulk damage, damaged growth, and dynamic behaviors of both the fundamental frequency (1ω) absorptive and the third harmonic frequency (3ω) transparent fluoride-containing phosphate glasses are explored utilizing the time-resolved pump-probe shadowgraph technique. It is found that the low-temperature (1000 °C) glass melting process resulted in increase of the absorption coefficient at 355 nm and decrease of the optical bandgap for 1ω absorptive glass, the produced 1ω absorptive glass was subjected to higher shock pressure and shock temperature on rear surface after single-pulse laser irradiation, and it had more serious filamentation damage accompanied by funnel-shape morphology. With subsequent multi-pulse irradiation, the initial bulk damage area increased exponentially with a growth coefficient of 4.57. The corresponding exponential growth coefficient for the counterpart 1ω absorptive glass melted at high-temperature (1200 °C) is only 1.72 due to its slight initial bulk damage. In contrast, for the 3ω transparent glass, the high-temperature (1200 °C) melting process corresponded to larger initial bulk damage area and largest exponential growth coefficient of 3.15, which is 1.5 times higher than that of 3ω transparent glass melted at low-temperature (1000 °C), and they showed wave-packed damaged morphologies extending from the rear surface into the glass body. Conclusively, the melting temperatures showed opposite influence regularity on these two investigated fluoride-containing phosphate glasses, i.e., the high-temperature (1200 °C) melting process favors the improvement of UV laser-induced damage resistance of 1ω absorptive glass evidenced by higher UV laser-induced damage threshold (LIDT) and lower damage growth coefficient, while the low-temperature (1000 °C) melting process exerts similar effect on the 3ω transparent glass. ? 2024, The Authors. All rights reserved.Affiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Shaanxi, Xi’an; 710119, China; (2) State Key Laboratory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology, Shanxi, Xi’an; 710024, China; (3) School of Science, Southwest University of Science and Technology, Mianyang; 621010, China; (4) Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang; 621010, ChinaPublication Year:2024DOI Link:10.2139/ssrn.4880563數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20240269780 -
Record 317 of
Title:Dielectric terahertz metasurface governed by symmetry-protected BIC for ultrasensitive sensing
Author Full Names:Yan, Hui(1,2,3); Fan, Wen-Hui(1,3,4); Jiang, Xiao-Qiang(1,3); Chen, Xu(1); Qin, Chong(1,3); Wu, Qi(1,3)Source Title:Physica ScriptaLanguage:EnglishDocument Type:Journal article (JA)Abstract:The non-radiative bound states in the continuum (BIC) have attracted much attention in achieving theoretically infinite quality (Q) factor. In this paper, a dielectric terahertz metasurface with C 4v symmetry is proposed, and a toroidal dipole resonance is easily obtained under incident plane wave. Moreover, by slightly tuning the asymmetry parameter δ to break the in-plane symmetry of the structure (side length perturbation), a magnetic dipole BIC mode radiates as quasi-BIC (QBIC) with extremely narrow linewidth and ultrahigh Q of 1.2 × 104 at δ = 0.4 μm. It shows significant performance in THz sensing with the sensitivity around 446 GHz/RIU and figure of merit (FoM) up to 2267. The designed metasurface in the case of symmetry-breaking by position perturbation also achieves ultrasensitive sensing. Additionally, the effects of geometric parameters on the resonance modes have been comprehensively investigated. Our work provides a route to design symmetry-protected BIC metasurface with simple structure, and the Q factor as well as resonant frequency can be controlled using a single geometric parameter, which may facilitate designing high-performance metasurface in sensing applications. ? 2024 IOP Publishing Ltd.Affiliations:(1) 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) School of Physics and Optoelectronic Engineering, Zhongyuan University of Technology, Zhengzhou Key Laboratory of Low-dimensional Quantum Materials and Devices, Zhengzhou; 450007, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, ChinaPublication Year:2024Volume:99Issue:8Article Number:085503DOI Link:10.1088/1402-4896/ad59da數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20242716654606 -
Record 318 of
Title:Research on Laser Spectrum of Large-aperture Antenna Subreflector Pose Measurement
Author Full Names:Xuan, Zhang(1); Shangmin, Lin(2,3,4); Hu, Wang(1,2,3,4,5); Ming, Gao(1); Zhen, Wang(2); Yu, Jin(2,3); Jiang, Qiao(2,3); Yunqiang, Lai(2,3); Wenlong, He(2,3); Yaoke, Xue(2,3,6,7)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:6th Conference on Frontiers in Optical Imaging and Technology: Imaging Detection and Target RecognitionConference Date:October 22, 2023 - October 24, 2023Conference Location:Nanjing, ChinaConference Sponsor:The Chinese Society for Optical EngineeringAbstract:When the large-aperture antenna pose is measured by the laser method, the subreflector has a strong energy due to the convergence of the antenna itself and the instability of the near-ground atmosphere, and then the laser signal is easily drowned out. Atmospheric attenuation and other factors will weaken the laser transmission in different spectral bands, which reduces the recognition accuracy of laser spots. Aiming at the research of measuring the laser spectrum of large-aperture antenna, this paper analyzes the influence of atmospheric attenuation on the signals of different laser spectrum bands under the fixed distance of subreflector measurement, and compares the solar radiation energy of different wavelengths in laser. Finally, the stray light simulation analysis and experiments are carried out on different laser working spectrum bands to verify the accuracy of the spectrum research used in antenna measurement. Experiments show that the 1064 nm wavelength spectrum, as the working spectral band of the antenna measurement, the spot information is more obvious, which can effectively realize the extraction and identification of the spot center and provide a strong guarantee for the antenna pose measurement. ? 2024 SPIE. All rights reserved.Affiliations:(1) Xi'an Technological University, No.2 Xuefuzhonglu Road, Shaanxi, Xi'an; 710021, China; (2) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Science, No.17 Xinxi Road, Shaanxi, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, No.1 Yanqihu East Rd, Huairou District, Beijing; 101408, China; (4) Xi’an Space Sensor Optical Technology Engineering Research Center, No.17 Xinxi Road, Shaanxi, Xi'an; 710119, China; (5) Key Laboratory of Space Precision Measurement Technology, Chinese Academy of Sciences, No.17 Xinxi Road, Shaanxi, Xi'an; 710119, China; (6) Beijing University of Aeronautics and Astronautics, Beijing; 100191, China; (7) Youth Innovation Promotion Association, Beijing; 10029, ChinaPublication Year:2024Volume:13156Article Number:131561NDOI Link:10.1117/12.3022954數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20242016093111 -
Record 319 of
Title:Retrieval of the Aerosol Scale Height over the Ocean Based on Near-Infrared Multiangle Polarization Measurements
Author Full Names:Pan, Tianfeng(1,2); He, Xianqiang(2,3); Bai, Yan(2,3); Shanmugam, Palanisamy(4); Liu, Jia(5); Gong, Fang(2); Wang, Difeng(2); Li, Teng(2)Source Title:IEEE Transactions on Geoscience and Remote SensingLanguage:EnglishDocument Type:Journal article (JA)Abstract:Multiangle polarization measurements in the near-infrared band from space were illustrated as suitable for the inversion of aerosol vertical distribution (AVD) information. In this study, we reported the interference of the AVD to linearly polarized radiances (ρQ) and ρU) ) and scalar radiance (rhoI) ) under different simulation configurations, and the sensitivity discrepancies of ρI) , ρQ) , and ρU) to the aerosol scale height were analyzed by theoretical calculation of Mie scattering theory. Furthermore, the high correlation between polarization measurements in the near-infrared band and AVD inspired to perform polarization measurement inversion of the aerosol layer height (ALH). The constructed model was based on nonlinear optimization and the total-Absorption ocean assumption. By fitting the linearly polarized radiances obtained by polarization observations in the near-infrared band, the AVD information were retrieved. The evaluation indicators showed that the root mean square error (RMSE) of the retrievals is less than 1 km for three typical sea areas, which demonstrates that polarization inversion is a valuable addition to light dectection and ranging (Lidar) data for AVD measurement. ? 1980-2012 IEEE.Affiliations:(1) Zhejiang University, Ocean College, Zhoushan; 316021, China; (2) Second Institute of Oceanography, Ministry of Natural Resources, State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou; 310012, China; (3) Donghai Laboratory, Zhoushan; 316021, China; (4) Indian Institute of Technology Madras, Ocean Optics and Imaging Laboratory, Department of Ocean Engineering, Chennai; 600036, India; (5) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Key Laboratory of Spectral Imaging Technology, Xi'an; 710119, ChinaPublication Year:2024Volume:62Article Number:4112716DOI Link:10.1109/TGRS.2024.3495036數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20244717396894 -
Record 320 of
Title:Error Correction for Cell Calibration of SO2 Ultraviolet Camera
Author Full Names:Zhang, Huiliang(1); Li, Faquan(2); Li, Juan(3); Wang, Houmao(4); Zhang, Zihao(1); Guo, Jianjun(1); Wu, Kuijun(1); He, Weiwei(1)Source Title:Guangxue Xuebao/Acta Optica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:Objective Industrial chimneys, ship exhaust, and volcanic eruption processes can emit large amounts of harmful SO2 into the atmosphere, causing serious pollution to the environment. The development of effective SO2 monitoring tools can provide a strong guarantee for atmospheric environmental management. In recent years, SO2 ultraviolet (UV) cameras have been rapidly developed and widely applied by virtue of their high spatio-temporal resolution, high detection sensitivity, and two-dimensional detection imaging capability. Due to the limitation of physical principles, the initial amount measured by the SO2 UV camera is the optical thickness of SO2 gas, which needs to be retrieved into a concentration image with the help of calibration curves, and the accuracy of calibration curves directly affects the accuracy of SO2 concentration results. Cell calibration and differential optical absorption spectroscopy (DOAS) calibration are two main methods for obtaining calibration curves. In terms of equipment cost, easy operation, and system stability, the cell method is significantly better than the DOAS method, but its calibration accuracy is seriously affected by the light dilution effect, reflections on the windows of the calibration cell and filter, and aerosol scattering factors. Additionally, with the rising detection distance, the above factors, especially the influence of the light dilution effect, become increasingly more serious. To improve the calibration accuracy of the cell method, we research the calibration error correction method to address the practical problem of inaccurate cell method calibration in remote SO2 monitoring. Methods In practice, since the factors affecting the accuracy of the cell method are mainly from the light dilution effect, window reflection, and the scattering of aerosols, it is necessary to correct each of these factors. The specific method is as follows. Firstly, the image correction method (ICM) is proposed for correcting the light dilution effect, and the extinction coefficient is obtained by fitting the intensity information of the measurement points at different distances in the UV camera images. Additionally, the optical thickness image of the cell at the measured distance is calculated by the extinction coefficient, and then the calibration curve with the correction of the light dilution effect is obtained. Then, based on the analysis of window reflection and aerosol scattering effect, the influence of the reflection effect and scattering characteristics on the calibration results are quantified. Finally, the calibration curves with the correction of light dilution effect and scattering characteristics are calculated by combining the above influencing factors. Results and Discussions Based on the Etna volcanic plume image data captured by Professor Jonas Gli? from the Norwegian Air Research Institute using a SO2 ultraviolet camera, the Etna volcanic plume SO2 concentration image is retrieved by calibration curves before and after the correction of the light dilution effect. The results are compared with the retrieval results of the DOAS calibration curve, and the results show that the correction of the light dilution effect can reduce the differences between the cell method and the DOAS method from 59.0% to 31.3%, which verifies the effectiveness of ICM in correcting light dilution effect. After correction for reflection and scattering effects, the difference between the cell method and the DOAS method is reduced to 7%. The cell method and DOAS method show good agreement in the time domain after correction, and the fitting curve slope of the primary function of the calibration results is 0.924, with a goodness-of-fit of 0.998. Conclusions The results show that the proposed error correction method for cell calibration of the SO2 UV camera can improve the calibration curve accuracy. The fitting accuracy of the extinction coefficient and the measurement accuracy of the filter reflectance and the quartz window directly affect the accuracy of the calibration curve. The error analysis results show that a 10% shift in the extinction coefficients ΕA and ΕB obtained from channels A and B fitting will cause an error of 8.44% and 13.57% for SO2 column density retrieval respectively, while a 10% shift in background light intensity will result in an error of 4.98% for SO2 column density retrieval. Additionally, a 10% error in the filter reflectance and the quartz window will result in a 6.26% and 1.95% shift in the SO2 column density respectively. Increasing the interval distance of sampling points and the number of sampling points can improve the fitting accuracy of the extinction coefficient. The high-resolution UV spectrometer ensures that the filter reflectance and the quartz window are accurately measured to control errors caused by the reflectance uncertainty. The proposed error correction method for calibration curves solves the limitation that the cell method cannot be applied to monitor the plumes at long distances and high carbon black concentrations, which is important for better applications of SO2 UV cameras in volcanoes, ships, and industrial chimneys. ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) School of Physics and Electronic Information, Yantai University, Shandong, Yantai; 264005, China; (2) Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Hubei, Wuhan; 430071, China; (3) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi'an; 710119, China; (4) National Space Science Center, Chinese Academy of Sciences, Beijing; 100190, ChinaPublication Year:2024Volume:44Issue:6Article Number:0601007DOI Link:10.3788/AOS230886數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20241215789360 -
Record 321 of
Title:Strengthened Residual Graph and Multiscale Gated Guided Convolutional Fusion Network for Hyperspectral Change Detection
Author Full Names:Xu, Shufang(1,2); Xia, Xiangfei(1); Li, Haiwei(3); Zhang, Yiyan(4); Sheng, Runhua(2); Gao, Hongmin(2); Zhang, Bing(5)Source Title:IEEE Transactions on Geoscience and Remote SensingLanguage:EnglishDocument Type:Journal article (JA)Abstract:Hyperspectral image (HSI) change detection (CD) focuses on identifying changes in the internal components of land cover and land use. Convolutional neural networks (CNNs) have made significant progress in HSI-CD. Concurrently, graph convolutional networks (GCNs) have gained considerable attention for their ability to utilize unlabeled data and explicitly exploit correlations between adjacent parcels. However, CNNs are constrained by fixed, small-size convolutional kernels, which severely limit their receptive field. On the other hand, GCNs use superpixels to reduce the number of nodes, which will lead to losing pixel-level features, resulting in partial feature representations from both networks. To leverage the strengths of both CNNs and GCNs, a model was proposed that incorporates two subnetworks: decomposed multiscale gated guided CNNs and strengthened residual graph convolution. The decomposed multiscale gated guided CNNs are designed to capture pixel-level features at various scales using different kernel sizes. A gated change information fusion (GCF) unit integrates these multiscale pixel-level features. Meanwhile, the strengthened residual graph convolution was used to aggregate change information, which can prevent node information from becoming homogeneous. Additionally, a feature fusion module (FFM) is employed to combine features from the two subnetworks. The proposed model effectively utilizes both multiscale convolution and graph features, facilitating the learning of multilevel contextual semantic features. The experimental results on three HSI datasets demonstrate that this model outperforms several state-of-the-art methods. The code is available at https://github.com/zhangyiyan001/srgmgn. ? 2024 IEEE.Affiliations:(1) Hohai University, College of Computer Science and Software Engineering, Nanjing; 211100, China; (2) Shaanxi Key Laboratory of Optical Remote Sensing and Intelligent Information Processing, Xi'an; 710119, China; (3) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Key Laboratory of Spectral Imaging Technology, CAS, Xi'an; 710119, China; (4) Hohai University, College of Information Science and Engineering, Changzhou; 213200, China; (5) Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing; 100094, ChinaPublication Year:2024Volume:62Article Number:5540014DOI Link:10.1109/TGRS.2024.3508063數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20244917488267 -
Record 322 of
Title:An enhanced gated MCP-PMT for neutron detection in laser fusion experiments
Author Full Names:Li, Kuinian(1,2,3); Chen, Ping(1,7); Liu, Hulin(1); Wei, Yonglin(1); He, Luanxuan(1,2,3); Su, Xiao(4,6); Yang, Yang(1); Gou, Yongsheng(1); Tian, Jinshou(1); Wu, Shengli(2); Yuan, Xiaohui(4,6); Zhang, Zhe(5); Zhang, Jie(4,5,6)Source Title:Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentLanguage:EnglishDocument Type:Journal article (JA)Abstract:The microchannel plate photomultiplier tube (MCP-PMT) is a photodetector that utilizes microchannel plates for signal amplification, offering rapid pulse response time of sub-nanosecond with a compact design and low dark current. A series of enhanced gated MCP-PMTs have been developed by incorporating a gating electrode between the photocathode and the MCPs, which have been employed in neutron detection during the double-cone ignition laser fusion experiment at the SGII Upgrade laser facilities. ? 2024Affiliations:(1) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100091, China; (4) Key Laboratory for Laser Plasmas, Ministry of Education and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai; 200240, China; (5) Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing; 100190, China; (6) Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai; 200240, China; (7) Collaborative lnnovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, ChinaPublication Year:2024Volume:1067Article Number:169726DOI Link:10.1016/j.nima.2024.169726數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20243416890221 -
Record 323 of
Title:Atomistic evidence of nucleation mechanism for the direct graphite-to-diamond transformation
Author Full Names:Luo, Duan(1); Yang, Liuxiang(2); Xie, Hongxian(3); Srinivasan, Srilok(1); Tian, Jinshou(4); Sankaranarayanan, Subramanian(1); Arslan, Ilke(1); Yang, Wenge(2); Mao, Ho-kwang(2,5); Wen, Jianguo(1)Source Title:CarbonLanguage:EnglishDocument Type:Journal article (JA)Abstract:The direct graphite-to-diamond transformation mechanism has been a subject of intense study and remains debated concerning the initial stages of the conversion, the intermediate phases, and their transformation pathways. Here, we successfully recover samples at the early conversion stage by tuning high-pressure/high-temperature conditions and reveal direct evidence supporting the nucleation-growth mechanism. Atomistic observations show that intermediate orthorhombic graphite phase mediates the growth of diamond nuclei. Furthermore, we observe that quenchable orthorhombic and rhombohedra graphite are stabilized in buckled graphite at lower temperatures. These intermediate phases are further converted into hexagonal and cubic diamond at higher temperatures following energetically favorable pathways in the order: graphite → orthorhombic graphite → hexagonal diamond, graphite → orthorhombic graphite → cubic diamond, graphite → rhombohedra graphite → cubic diamond. These results significantly improve our understanding of the transformation mechanism, enabling the synthesis of different high-quality forms of diamond from graphite. ? 2024 Elsevier LtdAffiliations:(1) Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL; 60439, United States; (2) Center for High Pressure Science and Technology Advanced Research, Beijing; 100094, China; (3) Hebei University of Technology, Tianjin; 300132, China; (4) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (5) Shanghai Key Laboratory MFree, Institute for Shanghai Advanced Research in Physical Sciences, Pudong, Shanghai; 201203, ChinaPublication Year:2024Volume:229Article Number:119538DOI Link:10.1016/j.carbon.2024.119538數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20243416906823 -
Record 324 of
Title:Generation of subcycle isolated attosecond pulses by pumping ionizing gating
Author Full Names:Wu, Zhaohui(1); Zeng, Xiaoming(1); Li, Zhaoli(1); Zhang, Zhimeng(1); Wang, Xiaodong(1); Wang, Xiao(1); Mu, Jie(1); Zuo, Yanlei(1); Su, Jingqin(1); Peng, Hao(2); Cao, Huabao(3); Fu, Yuxi(3); Riconda, C.(4); Weber, S.(5)Source Title:Physical Review ResearchLanguage:EnglishDocument Type:Journal article (JA)Abstract:We present an interesting approach named as pumping ionizing gating (PIG) for the generation of isolated attosecond pulses (IAPs). In this regime, a short laser is used to ionize a preexisting gas grating, creating a fast-extending plasma grating (FEPG) having an ionization front propagating with the velocity of light. A low-intensity long counterpropagating pump pulse is then reflected by a very narrow region of the ionization front, only where the Bragg conditions for resonant reflection is satisfied. Consequently, the pump reflection is confined within a subcycle region called PIG, and forms a wide-band coherent IAP in combination with the frequency up-conversion effect due to the plasma gradient. This approach results in a new scheme to generate IAPs from long picosecond pump pulses. Three-dimensional (3D) simulations show that a 1.6 ps, 1 μm pump pulse can be used to generate a 330 as laser pulse with a peak intensity approximately 33 times that of the pump and a conversion efficiency of around 0.1%. These results highlight the potential of the PIG method for generating IAPs with high conversion efficiency and peak intensity. ? 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) National Key Laboratory of Plasma Physics, Research Center of Laser Fusion, China Academy of Engineering Physics, Sichuan, Mianyang; 621900, China; (2) College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen; 518060, China; (3) Center for Attosecond Science and Technology, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi'an; 710119, China; (4) LULI, Sorbonne Université, CNRS, école Polytechnique, CEA, Paris; F-75005, France; (5) ELI Beamlines Facility, Extreme Light Infrastructure ERIC, Dolni Brezany; 25241, Czech RepublicPublication Year:2024Volume:6Issue:1Article Number:013126DOI Link:10.1103/PhysRevResearch.6.013126數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20240615527419