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Effects of Metal Absorber Thermal Conductivity on Clear Plastic Laser Transmission Welding

Chinese Physics Letters 2018年第10期35卷 44-48页

作者： Min-Qiu Liu De-Qin Ouyang Chun-Bo Li Hui-Bin Sun Shuang-Chen Ruan Shenzhen Key Laboratory of Laser Engineering Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education InstitutesCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060 College of Physics Science and Technology Shenzhen UniversityShenzhen 518060 Sino-German College of Intelligent Manufacturing Shenzhen Technology UniversityShenzhen 518118

In our previous study, metals have been used as absorbers in the clear plastic laser transmission welding. The effects of metal thermal conductivity on the welding quality are investigated in the present work. Four metals with distinctly different thermal conductivities, i.e., titanium, nickel, molybdenum, and copper, are selected as light absorbers. The lap welding is conducted with an 808 nm diode laser and simulation experiments are also conducted. Nickel electroplating test is carried out to minimize the side-effects from different light absorptivities of different metals. The results show that the welding with an absorber of higher thermal conductivity can accommodate higher laser input power before smoking, which produces a wider and stronger welding *** positive role of the higher thermal conductivity can be attributed to the fact that a desirable thermal field distribution for the molecular diffusion and entanglement is produced from the case with a high thermal conductivity.

关键词： ab Effects of Metal Absorber Thermal Conductivity on Clear Plastic Laser Transmission Welding

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Large aperture phase-coded diffractive lens for achromatic and 16°field-of-view imaging with high efficiency

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Chinese Physics B 2022年第7期31卷 349-360页

作者： Gu Ma Peng-Lei Zheng Zheng-Wen Hu Suo-Dong Ma Feng Xu Dong-Lin Pu Qin-Hua Wang School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215006China Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Laboratory of Modern Optical Technologies of Education Ministry of China Soochow UniversitySuzhou 215006China CAS Key Laboratory of Space Precision Measurement Technology Xi’an 710119China

Diffractive lenses(DLs)can realize high-resolution imaging with light weight and compact *** DLs suffer large chromatic and off-axis aberrations,which significantly limits their practical *** many achromatic methods have been proposed,most of them are used for designing small aperture DLs,which have low diffraction *** the designing of diffractive achromatic lenses,increasing the aperture and improving the diffraction efficiency have become two of the most important design ***,a novel phase-coded diffractive lens(PCDL)for achromatic imaging with a large aperture and high efficiency is proposed and demonstrated experimentally,and it also possesses wide field-of-view(FOV)imaging at the same *** phase distribution of the conventional phase-type diffractive lens(DL)is coded with a cubic function to expand both the working bandwidth and the FOV of conventional *** proposed phase-type DL is fabricated by using the laser direct writing of grey-scale patterns for a PCDL of a diameter of 10 mm,a focal length of 100 mm,and a cubic phase coding parameter of 30π.Experimental results show that the working bandwidth and the FOV of the PCDL respectively reach 50 nm and 16°with over 8%focusing efficiency,which are in significant contrast to the counterparts of conventional DL and in good agreement with the theoretical *** work provides a novel way for implementing the achromatic,wide FOV,and high-efficiency imaging with large aperture DL.

关键词： achromatic imaging diffractive lens phase coding large aperture high efficiency

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Null compensator testing convex freeform surface mirror with CGH technology

Null compensator testing convex freeform surface mirror with...

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2012 International Conference on Future optical Materials and Circuit Design, FOMCD 2012

作者： Zhang, Zhong-Yu Zhang, Bin-Zhi Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics CAS Changchun 130033 China

ISBN: (纸本)9783037856413

The Computer Generated Hologram (CGH) technique is the main method for optical testing the free form *** testing a convex free form surface mirror, a CGH element with the surface testing, interferometer and free form mirror precise position function was designed by use of appropriative software, the testing precision was less than 0.011λ(λ=632.8nm) in RMS value by this means. © (2013) Trans Tech Publications, Switzerland.

关键词： Computer generated holography

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Thermal management for thermoset automated fiber placement based on infrared heater structure arrangement

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Chinese Journal of Aeronautics 2022年第1期35卷 173-183页

作者： Han WANG Weiwei WANG Haijin WANG Huiyue DONG Yinglin KE A State Key Laboratory of Fluid Power and Mechatronic System School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

Layup temperature is a vital factor that affects the production quality of automated fiber placement for thermoset *** high quality production,this paper proposes a new prediction model of layup temperature by considering the structure of infrared heater of automatic fiber placement *** model was first verified by comparing with the temperature results of layup *** a prediction on the effects of heater structure arrangement on layup temperature was conducted in the *** research shows that the length of infrared tube and the radian of reflective-film have significant influences,rather than other *** to this investigation,a heater structure-based heating strategy was presented in the paper to efficiently achieve constant temperature control in variable speed layup process.

关键词： Automated fiber placement Heating strategy optimization Infrared heater structure Thermal management Variable speed

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pH-driven interfacial bond dynamics enable high-efficiency low-damage polishing of fused silica with CeO 2 based slurries

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Journal of Materials Processing technology 2025年 341卷

作者： Fukun Li Yang Bai HaiXiang Hu Guanbo Qiao Lingzhong Li Feng Zhang Xuejun Zhang Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Advanced Manufacturing for Optical System Changchun Jilin 130033 China

Achieving atomic-level surface integrity while maintaining a high material removal rate (MRR) remains a fundamental challenge in the polishing of fused silica due to its high hardness and brittleness. This study establishes a novel mechanistic framework for understanding how pH-driven interfacial bond dynamics govern chemo-mechanical polishing processes. By integrating multiscale experimental characterization (XPS, FTIR, Raman spectroscopy) with ReaxFF molecular dynamics simulations, we demonstrate for the first time that the dynamic equilibrium between the formation and rupture of Ce–O–Si interfacial bonds directly control removal efficiency and surface quality. Alkaline conditions enhance OH – activity, facilitating Si–O bond hydrolysis and stable Ce–O–Si linkage formation, resulting in the highest MRR (397.6 nm/min). Acidic environments promote citrate-mediated Ce 3 + complexation and nanocluster dispersion, enabling a rolling mechanism that achieves ultra-smooth surfaces (Sq = 0.086 nm). In contrast, neutral pH conditions suffer from PEG adsorption blocking active sites, leading to a 62 % reduction in MRR relative to alkaline systems. A 12.2-fold increase in MRR compared to SiO 2 abrasives (32.67 nm/min) confirms that chemical interfacial dynamics, rather than mechanical abrasion alone, are critical to material removal. This fundamental advancement provides a broadly generalizable theoretical basis for designing efficient, low-damage precision polishing processes across oxide-based optical materials and beyond.

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Effects of the gap slope on the distribution of removal rate in Belt-MRF

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Optics Express 2017年第22期25卷 26600-26614页

作者： Wang, Dekang Hu, Haixiang Li, Longxiang Bai, Yang Luo, Xiao Xue, Donglin Zhang, Xuejun Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences ChangchunJilin130033 China University of Chinese Academy of Sciences Beijing100049 China

Belt magnetorheological finishing (Belt-MRF) is a promising tool for large-optics processing. However, before using a spot, its shape should be designed and controlled by the polishing gap. Previous research revealed a remarkably nonlinear relationship between the removal function and normal pressure distribution. The pressure is nonlinearly related to the gap geometry, precluding prediction of the removal function given the polishing gap. Here, we used the concepts of gap slope and virtual ribbon to develop a model of removal profiles in Belt-MRF. Between the belt and the workpiece in the main polishing area, a gap which changes linearly along the flow direction was created using a flat-bottom magnet box. The pressure distribution and removal function were calculated. Simulations were consistent with experiments. Different removal functions, consistent with theoretical calculations, were obtained by adjusting the gap slope. This approach allows to predict removal functions in Belt-MRF. © 2017 optical Society of America.

关键词： Pressure distribution

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An optimum design method for nonlinear system using an improved neural network

An optimum design method for nonlinear system using an impro...

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International Conference on Computer Science and Software Engineering, CSSE 2008

作者： Cai, Miao Yang, Dao-Guo Chen, Wenbin Li, Quan-Yong Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology Guilin University of Electronic Technology Guilin 541004 China

ISBN: (纸本)9780769533360

The optimization design for a complex nonlinear system is difficult to be achieved by using the traditional methods. This paper presents an optimization design method for nonlinear system by using an improved neural network. The proposed approach is a combination of Error Back-Propagation Neural Network (BPNN), Principal Component Analysis (PCA) and Genetic Algorithms (GAs). PCA is employed to reduce the dimension and de-noise for the learning matrix of BPNN model. A combination of GAs and the BPNN model is used to find the most appropriate linking weight with its global search feature. As a demonstration example, the optimization method for selecting the material and dimension parameters for a QFN package is explored. Firstly, in order to search for the optimal parameter combination, the well-trained network model, which includes a nonlinear function of the input parameters and corresponding outputs, is considered as an observation tool to select optimal parameter size as to reduce the J-integral value of interface cracking in the packaging device. Secondly, the optimal parameter combinations are selected for the device after verification. The results from the optimization design show that the well-trained PCA-GA-BPNN model using the proposed approach can be used in the optimization design of the microelectronics packaging device to reduce the interface delamination problems. © 2008 IEEE.

关键词： Principal component analysis

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Simultaneous Measurement of One Dimensional Bending and Temperature Based on Mach-Zehnder Interferometer

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Photonic Sensors 2015年第4期5卷 376-384页

作者： Yongqin YU College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China Shenzhen Key Laboratory of Laser Engineering Shenzhen 518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen University Shenzhen 518060 China

A simple and compact optical fiber directional bending vector sensor with simultaneous measurement of temperature based on the Mach-Zehnder interferometer （MZI） is proposed and experimentally demonstrated. The device consists of a piece of photonic crystal fiber （PCF） sandwiched between two single mode fibers （SMFs） with a lateral offset splicing. It shows the capacity for recognizing positive and negative directions. Within a curvature range of-7.13m-1 to 7.13 m-1, the bending sensitivities of two resonant dips with opposite fiber orientations are obtained to be 0.484 nm/m-1 and 0.246 nm/m-1, respectively. This simple MZI is formed by invoking interference between LP01 and LP21 core modes, which leads to that the sensor is not sensitive to ambient refractive index （ARI）. The temperature sensitivity has also been investigated. Two dips have obviously different sensitivities on the temperature and bending, so two parameters of both curvature and temperature can be distinguished and measured simultaneously by constructing a matrix and using one simple model interferometer.

关键词： Fiber optics sensors microstructured fiber temperature sensor curvature sensor

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Effect of gap and overlap on mode Ⅱ interlaminar fracture toughness of automated fiber placement prepreg laminates

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Chinese Journal of Aeronautics 2023年第6期36卷 390-401页

作者： Fan ZHANG Xin LIU Yaoyao YE Qisen CHEN Qiang XU Yunbo BI China State Key Laboratory of Fluid Power and Mechatronic System School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

Automated Fiber Placement(AFP)technology facilitates the manufacturing process of composite structures with complex geometry owing to its high efficiency and *** unavoidable imperfections induced by the automated layup method bring challenges to the stability of the final mechanical properties of *** influence of AFP-induced gaps and overlaps on the modeⅡinterlaminar fracture process of oven-cured laminates is experimentally investigated and explicitly ***-Notched Flexure(ENF)tests were performed to measure the interlaminar fracture toughness of unidirectional laminates under three different defect configurations,namely"Gap""Overlap"and"Gap&Overlap".A marginal decline(about-1.2%in non-precracked tests,-5.1%in precracked tests)and an obvious increase(about 15.2%in nonprecracked tests,5.2%in precracked tests)in fracture toughness were observed for the"Gap"group and the"Overlap"group,*** studies which involve the metallographic observation and Scanning Electron Microscopy(SEM)observation revealed that the increases in fracture area and crack length helped improve the fracture toughness of the Overlap"***,the resin-rich area with high porosity induced by gaps was detrimental to the delamination *** capture the interlaminar stress distribution local to imperfections,a three-dimensional numerical model was *** defects facilitate the local delamination process,and the overlap defect postpones the damage onset and the propagation.

关键词： Automated Fiber Placement(AFP) Defects Delamination Fracture toughness Laminates

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Natural van der Waals canalization lens for non-destructive nanoelectronic circuit imaging and inspection

arXiv

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arXiv 2025年

作者： Ou, Qingdong Xue, Shuwen Ma, Weiliang Yang, Jiong Si, Guangyuan Liu, Lu Zhong, Gang Liu, Jingying Xie, Zongyuan Xiao, Ying Kalantar-Zadeh, Kourosh Qi, Xiang Li, Peining Dai, Zhigao Chen, Huanyang Bao, Qiaoliang Faculty of Innovation Engineering Macau University of Science and Technology Macao Taipa999078 China Department of Materials Science and Engineering Monash University ClaytonVIC3800 Australia Department of Physics Xiamen University Xiamen361005 China National Engineering Research Center of Electromagnetic Radiation Control Materials Key Laboratory of Multi-spectral Absorbing Materials and Structures Ministry of Education University of Electronic Science and Technology of China Chengdu610054 China School of Optoelectronic Science and Engineering Collaborative Innovation Center of Suzhou Nano Science and Technology Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province Key Lab of Modern Optical Technologies Education Ministry of China Soochow University Suzhou215006 China Melbourne Centre for Nanofabrication Victorian Node of The Australian National Fabrication Facility ClaytonVIC3168 Australia Engineering Research Center of Nano-Geomaterials Ministry of Education Faculty of Materials Science and Chemistry China University of Geosciences Wuhan430074 China School of Chemical and Biomolecular Engineering The University of Sydney SydneyNSW Australia Hunan Key Laboratory for Micro-Nano Energy Materials and Devices School of Physics and Optoelectronic Xiangtan University Hunan411105 China Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan430074 China Shenzhen Research Institute China University of Geosciences Shenzhen518063 China University of Shanghai for Science and Technology Shanghai200093 China Nanjing kLIGHT Laser Technology Co. Ltd. Jiangsu Nanjing210032 China

optical inspection has long served as a cornerstone non-destructive method in semiconductor wafer manufacturing, particularly for surface and defect analysis. However, conventional techniques such as bright-field and dark-field scattering optics face significant limitations, including insufficient resolution and the inability to penetrate and detect buried structures. Atomic force microscopy (AFM), while offering higher resolution and precise surface characterization, is constrained by slow speed, limited to surface-level imaging, and incapable of resolving subsurface features. Here, we propose an approach that integrates the strengths of dark-field scattering optics and AFM by leveraging a van der Waals (vdW) canalization lens based on natural biaxial α-MoO3 crystals. This method enables ultrahigh-resolution subwavelength imaging with the ability to visualize both surface and buried structures, achieving a spatial resolution of 15 nm and grating pitch detection down to 100 nm. The underlying mechanism relies on the unique anisotropic properties of α-MoO3, where its atomic-scale unit cells and biaxial symmetry facilitate the diffraction-free propagation of both evanescent and propagating waves via a flat-band canalization regime. Unlike metamaterial-based superlenses and hyperlenses, which suffer from high plasmonic losses, fabrication imperfections, and uniaxial constraints, α-MoO3 provides robust and aberration-free imaging in multiple directions. We successfully applied this approach to achieve high-resolution inspection of buried nanoscale electronic circuits, offering unprecedented capabilities essential for next-generation semiconductor manufacturing. © 2025, CC BY-NC-ND.

关键词： Van der Waals forces

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