检索结果-内蒙古大学图书馆

Observing the collapse of super-Bloch oscillations in strong-driving photonic temporal lattices

Advanced Photonics 2024年第4期6卷 14-24页

作者： Xinyuan Hu Shulin Wang Chengzhi Qin Chenyu Liu Lange Zhao Yinglan Li Han Ye Weiwei Liu Stefano Longhi Peixiang Lu Bing Wang Huazhong University of Science and Technology School of PhysicsWuhan National Laboratory for OptoelectronicsWuhanChina Wuhan Institute of Technology Hubei Key Laboratory of Optical Information and Pattern RecognitionWuhanChina Politecnico di Milano Dipartimento di FisicaMilanoItaly IFISC(UIB-CSIC) Instituto de Fisica Interdisciplinary Sistemas ComplejosPalma de MallorcaSpain

Super-Bloch oscillations(SBOs)are amplified versions of direct current(dc)-driving Bloch oscillations realized under the detuned dc-and alternating current(ac)-driving electric fields.A unique feature of SBOs is the coherent oscillation inhibition via the ac-driving renormalization effect,which is dubbed as the collapse of ***,previous experimental studies on SBOs have only been limited to the weak ac-driving regime,and the collapse of SBOs has not been ***,by harnessing a synthetic temporal lattice in fiber-loop systems,we push the ac-field into a strong-driving regime and observe the collapse of SBOs,which manifests as the oscillation-trajectory localization at specific ac-driving amplitudes and oscillation-direction flip by crossing collapse *** adopting arbitrary-wave ac-driving fields,we also realize generalized SBOs with engineered collapse ***,we exploit the oscillation-direction flip features to design tunable temporal beam routers and *** initiate and demonstrate the collapse of SBOs,which may feature applications in coherent wave localization control for optical communications and signal processing.

关键词： super-Bloch oscillations band collapse ac-driving renormalization effect photonic temporal lattices strong-driving regime

来源：评论

学校读者我要写书评

暂无评论

Numerical Insights into noise amplification of high-energy mid-infrared supercontinuum generation in normal dispersion multimode fibers

arXiv

引用

arXiv 2024年

作者： Yang, Chaofan Duan, Dian Zou, Fan Liu, Kuo Jin, Ruibo Liu, Zechuan Wu, Haoyu Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China

We report on the noise properties of high-energy mid-infrared supercontinuum (MIR-SC) generation in normal dispersion multimode fibers from the numerical perspective. Noise amplification in multi-modes is primarily due to the stimulated Raman scattering (SRS) effect. This leads to the emergence of "incoherent cloud formation" and "incoherent optical wave breaking", similar to those observed in single-mode fibers. Increasing the pump technical noise from 0.1 % to 1 % significantly shortens the lumped coherence length LC and exacerbates the influence of incoherent broadening dynamics competing with coherent dynamics, resulting in MIR-SC being a strong consistency in the collapse evolution of amplitude noise and phase coherence. To minimize this noise amplification and achieve high-energy low-noise MIR-SC in practical applications, it is essential to use short-pulse pumping with low amplitude noise, ensuring that LC>>LOWB (where LOWB denotes the optical wave breaking length). Copyright © 2024, The Authors. All rights reserved.

关键词： Supercontinuum generation

来源：评论

学校读者我要写书评

暂无评论

Automatic Docking Design of Flange Pipe Based on Spatial information

Automatic Docking Design of Flange Pipe Based on Spatial Inf...

引用

International Conference on information Science and Control Engineering (ICISCE)

作者： Xingxun Li Xiuhua Zhang Jinmeng Wu Jian Huang Pianpian Chen Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan China Hubei Engineering Research Center of Video Image and HD Projection Wuhan Institute of Technology Wuhan China

With the development of ship industry, pipeline system has been more and more widely used. However, the pipeline site space is narrow. Mechanical and electrical equipments are of all kinds. The pipeline cable is densely distributed. All problems mentioned above seriously affects the pipeline construction. In order to solve the problem of pipeline docking, the method of making model and comprehensive lofting is usually adopted. However, this method is technically backward. The operation is inconvenient due to the narrow onsite space. The required period is long. With low information utilization and accuracy, the method of making model and comprehensive lofting has a great influence on the development cycle and design quality. In order to solve these problems, this paper presents a design method and system of flange pipe docking. A binocular camera is used to obtain the image of the pipe joint. The center position of the flange surface and array holes on the flange surface are extracted from the image, which is bias of subsequent work. First, the path of the intermediate connecting pipe is calculated. Then, according to the pipe standards of intermediate connection pipe and production specification of enterprise, the model of intermediate connecting pipe is automatically generated by using secondary development technology of CAD. In this paper, the binocular vision technology is combined with pipeline docking design, which significantly improves the utilization rate of field space information and design efficiency, and solves the problems of inconvenient operation and safety risk of traditional profiling method.

关键词： Industries Solid modeling Design methodology Pipelines Production Flanges Feature extraction

来源：评论

学校读者我要写书评

暂无评论

Research on Laser Measurement of 3D curved Glass Contour based on computer Vision

Research on Laser Measurement of 3D curved Glass Contour bas...

引用

International Conference on information Science and Control Engineering (ICISCE)

作者： Peng Wang Jinmeng Wu Guilin Yan Shuo Bian Hubei Key Laboratory of Optical Information and Pattern Recognition Hubei Research Centre of Video Image and High Definition Projection Wuhan Institute of Technology Wuhan China School of Mechanical and Electrical Engineering School of Electrical and Information Engineering

In the mobile phone glass industry, curved glass is widely used. Whether the curved glass is measured with high efficiency and precision and whether the curved edge profile error can be evaluated directly affects the quality and service cycle of glass products. In view of the difficulty of accurate measurement and evaluation of 3D mobile phones curved glass profile, a visual measurement method of 3D mobile phones curved glass profile error based on laser scanning and shape template matching is proposed in this paper. Accurate measurement of mobile phone curved glass greatly improves the fit between curved glass and mobile phone and the efficiency of production. Therefore, this paper proposes a method for evaluating the contour degree of curved glass on mobile phones based on Open Cascade and OpenCV. This method uses the lasers and camera equipment to extract the profile outline of the curved glass, then extract the profile outline of the mobile phone curved glass model that has been drawn in 3D software. The extracted contour lines are matched by methods such as translation and rotation, and finally the distance between the corresponding points is calculated as the contour error. Experimental results show that the method is able to accurately measure the profile error and greatly reduce the measurement instability and have good robustness.

关键词： Computer vision Three-dimensional displays Shape Shape measurement Measurement uncertainty Measurement by laser beam Glass

来源：评论

学校读者我要写书评

暂无评论

Identification and Extraction of Circular Markers in 3D Reconstruction

Identification and Extraction of Circular Markers in 3D Reco...

引用

International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Yunfei Wang Hanyu Hong Jinmeng Wu Guangya Wang Shiyang Li Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan China Hubei Engineering Research Center of Video Image and HD Projection Wuhan China School of Electrical and Information Engineering Wuhan Institute of Technology Wuhan China

ISBN: (数字)9781728172361

ISBN: (纸本)9781728172378

This paper presents a method for the identification and location of circular markers in 3D reconstruction. The input image is processed with gray scale and gaussian filter to remove noise interference and improve the accuracy of edge detection. The size and direction of the gradient of the image were calculated to obtain the edge features of the circular marker, and the circle degree of the closed edge was judged, and the center of the marker was obtained by fitting the edge features with the ellipse of the least square method. Hu moment similarity of each marker was obtained, and the non-marker was deleted and the real marker was retained by similarity judgment. Experiments show that the algorithm has good robustness, high precision, can effectively reduce the probability of false detection, and has high accuracy in complex environments.

关键词： Image edge detection Transforms Three-dimensional displays Fitting Feature extraction Cameras Least mean squares methods

来源：评论

学校读者我要写书评

暂无评论

Comparison of multi-mode Hong-Ou-Mandel interference and multi-slit interference

arXiv

引用

arXiv 2023年

作者： Guo, Yan Yang, Zi-Xiang Zeng, Zi-Qi Ding, Chunling Shimizu, Ryosuke Jin, Rui-Bo Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China The University of Electro-Communications 1-5-1 Chofugaoka Chofu Tokyo Japan

Hong-Ou-Mandel (HOM) interference of multi-mode frequency entangled states plays a crucial role in quantum metrology. However, as the number of modes increases, the HOM interference pattern becomes increasingly complex, making it challenging to comprehend intuitively. To overcome this problem, we present the theory and simulation of multi-mode-HOM interference (MM-HOMI) and compare it to multi-slit interference (MSI). We find that these two interferences have a strong mapping relationship and are determined by two factors: the envelope factor and the details factor. The envelope factor is contributed by the single-mode HOM interference (single-slit diffraction) for MM-HOMI (MSI). The details factor is given by sin(Nx)/sin(x) ([sin(Nv)/sin(v)]2) for MM-HOMI (MSI), where N is the mode (slit) number and x(v) is the phase spacing of two adjacent spectral modes (slits). As a potential application, we demonstrate that the square root of the maximal Fisher information in MM-HOMI increases linearly with the number of modes, indicating that MM-HOMI is a powerful tool for enhancing precision in time estimation. We also discuss multi-mode Mach-Zehnder interference, multi-mode NOON-state interference, and the extended Wiener-Khinchin theorem. This work may provide an intuitive understanding of MM-HOMI patterns and promote the application of MM-HOMI in quantum metrology. © 2023, CC BY.

关键词： Quantum entanglement

来源：评论

学校读者我要写书评

暂无评论

A Novel Slight-Tilt Measure Method Based on Dynamic Vernier Effect Using Dual Fabry-Perot Interferometers on Vertical Cantilever Beam

SSRN

引用

SSRN 2022年

作者： Zhang, Songyang Wang, Shun Niu, Panting Cao, Jiyin Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China School of Mechanical and Electrical Engineering Wuhan Institute of Technology Wuhan430205 China

In this work, a new method for measuring slight tilt based on the dynamic Vernier effect is proposed and verified. A pair of the Fabry-Perot interferometers (FPIs) are fixed on the surfaces of a cantilever beam horizontally, and a mass block at the tail end of the beam supplies longitudinal strain on the surfaces, resulting in opposite variations in the cavity lengths (CLs) of FPIs. According to the principle of dynamic Vernier effect at the superposition of reflected light, the shift of the Vernier envelope would be proportional to the tilt angle of the entire structure. The experimental results revealed a strain sensitivity of as high as 6.733 nm/μΕ with a magnification factor of 41. Furthermore, the theoretical simulated results show that the maximum sensitivity would achieve from 204.408 nm/° to 613.25 nm/° within the tilt range from 0 to 15°. In addition, the merits of the proposed tilt sensor such as simple in structure, low cost, and temperature insensitivity in normal environments, all of which promise great application prospects in monitoring suddenly major structural deformation such as mountains and buildings © 2022, The Authors. All rights reserved.

关键词： Fabry-Perot interferometers

来源：评论

学校读者我要写书评

暂无评论

Adaptive iteration filter for suppression of impulse noise in color images

Adaptive iteration filter for suppression of impulse noise i...

引用

2012 International Conference on Mechatronic Systems and Automation Systems, MSAS 2012

作者： Wang, Gaihua Li, Dehua Zhao, Tongzhou Institute for pattern recognition and Artificial Intelligence Huazhong University of Science and Technology Wuhan 430074 China The College of Physics and Information Science of Xinjiang Normal University Urumqi 830053 China Hubei Province Key Laboratory of Intelligent Robot Wuhan Institute of Technology Wuhan 430073 China

ISBN: (纸本)9783037854921

New impulse detection and filtering algorithm is proposed in color images. Based on fast peer group filter, the proposed filtering algorithm uses different iteration times to complete filter according to different impulse noise density. The extensive experimental results show that the proposed scheme provides better performance than many of the existing vector filters. Meanwhile, the proposed approach is simple and practical for real-time application. © (2012) Trans Tech Publications, Switzerland.

关键词： Impulse noise

来源：评论

学校读者我要写书评

暂无评论

Determination of Electron Band Structure using Temporal Interferometry

引用

Physical Review Letters 2020年第15期124卷 157403-157403页

作者： Liang Li Pengfei Lan Lixin He Wei Cao Qingbin Zhang Peixiang Lu Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China CAS Center for Excellence in Ultraintense Laser Science Shanghai 201800 China

We propose an all-optical method to directly reconstruct the band structure of semiconductors. Our scheme is based on the temporal Young’s interferometer realized by high harmonic generation with a few-cycle laser pulse. As a time-energy domain interferometer, temporal interference encodes the band structure into the fringe in the energy domain. The relation between the band structure and the emitted harmonic frequencies is established. This enables us to retrieve the band structure from the spectrum of high harmonic generation with a single-shot measurement. Our scheme paves the way to study matters under ambient conditions and to track the ultrafast modification of band structures.

关键词： Band gap Electronic structure Nonlinear optics Ultrafast phenomena Semiconductors Band structure methods optical absorption spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Complete spectral characterization of biphotons by simultaneously determining their frequency sum and difference in a single quantum interferometer

引用

Physical Review A 2023年第2期108卷 023713-023713页

作者： Baihong Li (李百宏) Changhua Chen (陈昌花) Xiao Xiang (项晓) Runai Quan (权润爱) Ruifang Dong (董瑞芳) Shougang Zhang (张首刚) Xiangying Hao (郝向英) Rui-Bo Jin (金锐博) Department of Physics Shaanxi University of Science and Technology Xi'an 710021 China Key Laboratory of Time and Frequency Primary Standards National Time Service Center Chinese Academy of Sciences Xi'an 710600 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China

We propose theoretically a quantum interferometer in which the NOON state interferometer is combined with the Hong-Ou-Mandel interferometer. With this interferometer, the temporal interference patterns associated with biphoton frequency sum and difference can be shown in different parts of a single interferogram. It is thus possible to simultaneously obtain the spectral correlation information of biphotons in both frequency sum and difference by taking the Fourier transform from such an interferogram. This provides a method for complete spectral characterization of an arbitrary two-photon state with exchange symmetry and might be useful in quantum Fourier-transform spectroscopy where direct spectral measurement is difficult. Furthermore, as it can realize the measurement of time intervals on three scales at the same time, we expect that it can provide a method in quantum metrology. Finally, we discuss another potential application of such an interferometer in the generation and characterization of high-dimensional and phase-controlled frequency entanglement.

关键词： Photon pairs & parametric down-conversion Quantum foundations Quantum metrology

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：