Optics & Laser Technology最新文献_第9页

Achieving high robust laser conduction welding and enhanced joint conductivity in pure copper foil stacks using a flat-top blue laser 使用平顶蓝激光器在纯铜箔堆中实现高强度激光传导焊接并增强接缝传导性

Optics & Laser Technology Pub Date : 2024-02-14 DOI: 10.1016/j.optlastec.2024.110701

Le Wan, Zijue Tang, Huihui Yang, Hua Sun, Qianglong Wei, Yi Wu, Haowei Wang, Hongze Wang

{"title":"Achieving high robust laser conduction welding and enhanced joint conductivity in pure copper foil stacks using a flat-top blue laser","authors":"Le Wan, Zijue Tang, Huihui Yang, Hua Sun, Qianglong Wei, Yi Wu, Haowei Wang, Hongze Wang","doi":"10.1016/j.optlastec.2024.110701","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110701","url":null,"abstract":"The innovation of energy storage battery manufacturing technology, particularly the welding process of current collector pure copper foil stacks, is crucial for the development of the e-Mobility industry. This work aims to achieve high robust blue laser conduction welding (B-LCW) and enhance the joint conductivity of pure copper foil stacks. The conventional keyhole mode is replaced by blue laser conduction mode with a flat-top uniform energy distribution. The parameter, molten pool characteristics, surface morphology, microstructure, and conductivity were analyzed, and the correlation factors were examined. The results demonstrate that the high robust laser conduction welding of high-reflectivity/high-thermally-sensitive pure copper foil stacks was achieved, by which obtaining superior foil fusion connection and surface morphology compared to conventional infrared laser keyhole welding. Moreover, benefit from the high absorptivity (53.1%) and flat-top energy distribution of the blue laser, a high-stability molten pool and smooth welding seam were obtained. Meanwhile, the microstructure of the welding seam changes from small block-α-phase crystals to coarse columnar crystals with preferred orientation in the welding direction. The conductivity of the welding seam exceeds that of the base foil stacks, exhibiting a strong correlation with surface morphology and microstructure. Therefore, the high robust B-LCW process has considerable advantages in the welding of specific high-reflectivity foil stacks, which can promote the development of the new energy e-Mobility industry.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Real-time monitoring of weld surface morphology with lightweight semantic segmentation model improved by attention mechanism during laser keyhole welding 利用轻量级语义分割模型实时监控激光锁孔焊接过程中的焊缝表面形态（通过注意力机制加以改进

Optics & Laser Technology Pub Date : 2024-02-13 DOI: 10.1016/j.optlastec.2024.110707

Wang Cai, LeShi Shu, ShaoNing Geng, Qi Zhou, LongChao Cao

{"title":"Real-time monitoring of weld surface morphology with lightweight semantic segmentation model improved by attention mechanism during laser keyhole welding","authors":"Wang Cai, LeShi Shu, ShaoNing Geng, Qi Zhou, LongChao Cao","doi":"10.1016/j.optlastec.2024.110707","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110707","url":null,"abstract":"During the welding process, the molten metal continuously solidifies along the trailing edge of the molten pool to form the weld seam, so the change in the weld surface morphology can be monitored by the molten pool profile characteristics. In this study, an innovative weld surface morphology diagnosis strategy based on a lightweight semantic segmentation model improved by an attention mechanism is proposed. Considering the characteristics of molten pool morphology change, a semantic segmentation label automatic generation method is proposed, and a large number of high-precision training labels are quickly obtained. The constructed lightweight semantic segmentation model runs more than four times faster than the classical Unet, PSPnet, and Deeplabv3+. The molten pool segmentation accuracy of the constructed model can reach 94.95 % on the new dataset obtained from the test weld. The weld surface morphology reconstruction method is proposed, and the weld morphology size failure defect monitoring is realized based on the molten pool contour features. The validation results show that the constructed model has strong resistance to optical noise interference and generalization ability, and the reconstructed weld surface morphology is consistent with the actual morphological changes.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"178 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Terahertz liquid crystal suspended core photonic crystal fiber polarization rotator 太赫兹液晶悬浮纤芯光子晶体光纤偏振旋转器

Optics & Laser Technology Pub Date : 2024-02-13 DOI: 10.1016/j.optlastec.2024.110680

Esam A.A. Hagras, Mohamed Farhat O. Hameed, S.S.A. Obayya

{"title":"Terahertz liquid crystal suspended core photonic crystal fiber polarization rotator","authors":"Esam A.A. Hagras, Mohamed Farhat O. Hameed, S.S.A. Obayya","doi":"10.1016/j.optlastec.2024.110680","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110680","url":null,"abstract":"Tunable suspended core photonic crystal fiber (SC-PCF) is designed and investigated as a polarization rotator (PR) in the Terahertz (THz) band. In the proposed THz-SC-PCF-PR device, the backgrounds used are the air and TOPAS polymer. In order to enhancing the modal hybridity of the two polarized modes, the nematic liquid crystal (NLC) is used to increase the polarization conversion ratio. So, the core is filled with NLC type E7 material in the proposed THz-SC-PCF-PR design. Furthermore, the conversion ratio of the polarization can be adjusted by applying an external voltage. The modal and propagation analysis of the THz-SC-PCF-PR is studied using full vectorial finite difference approach. To reduce the device length while maintaining low crosstalk, the geometrical parameters are studied. At a conversion length of 2023 µm and a frequency of 0.6 THz, high conversion ratio of 99 % is attained with a minimum crosstalk of −19.76 dB. Furthermore, crosstalk is still less than −10 dB at a 0.1 THz bandwidth around the working frequency. Further, the proposed THz-SC-PCF-PR has a good fabrication tolerance for the geometrical parameters and temperature, ensuring the described design's viability in the THz domain.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Short pulsed laser ablation of Z-A ceramic matrix composite under ancillary environments: A comparative study 辅助环境下 Z-A 陶瓷基复合材料的短脉冲激光烧蚀：比较研究

Optics & Laser Technology Pub Date : 2024-02-13 DOI: 10.1016/j.optlastec.2024.110703

Sweta Rout, Debasish Panigrahi, S.K. Patel

{"title":"Short pulsed laser ablation of Z-A ceramic matrix composite under ancillary environments: A comparative study","authors":"Sweta Rout, Debasish Panigrahi, S.K. Patel","doi":"10.1016/j.optlastec.2024.110703","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110703","url":null,"abstract":"Z-A, as a ceramic matrix composite, holds complexity in machining compared to monolithic ceramic due to its fundamental structure, which creates a synergy of properties that depend on the reinforcing material and matrix. When it comes to machining this material, laser machining has garnered a significant role compared to any conventional practices. Despite its advantages, some challenges are associated with laser machining while processing thicker substrates, mainly heat accumulation and energy loss after certain passes. In order to overcome these challenges, a unique laser stepping-down milling process has been adopted in this study to process thicker Z-A under ancillary environments like ambient, liquid, and solid. The current study has also focused on examining the impact of various laser processing variables on the effectiveness of the current approach by scrutinizing the responses, such as ablation rate, shape distortion, heat accumulation effect, and hardness property of the Z-A. The results showed that to minimize the heat accumulation effect, low-temperature environments such as liquid and solid environments have proven their potentiality over ambient environment by compromising the ablation rate under similar laser processing variables. However, when comparing the crystal structure, surface morphology, and crack behavior, it has been found that the fundamental structure is restored in a solid environment, unlike in liquid and ambient environments. Additionally, no significant polymorphic transformation has been seen during the laser-induced sub-surface analysis in liquid and solid environments.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Light field control and automatic identification experimental system for physical impairment of glass samples 玻璃样品物理损伤的光场控制和自动识别实验系统

Optics & Laser Technology Pub Date : 2024-02-13 DOI: 10.1016/j.optlastec.2024.110698

Chongqi Wei, Baiqiang Zhao, Hongjun Zheng, Xin Li, Chenglin Bai, Weisheng Hu

引用次数: 0

The effects of laser line energy on welding strength of PASF/PC using magnesium zinc alloy powders as absorbents in laser transmission welding 在激光透射焊接中使用镁锌合金粉末作为吸收剂，激光线能量对 PASF/PC 焊接强度的影响

Optics & Laser Technology Pub Date : 2024-02-12 DOI: 10.1016/j.optlastec.2024.110702

Xiaodong Yu, Chenyi Ni, Haiyu Qiao, Yani Chen, Yayun Liu, Chuanyang Wang

{"title":"The effects of laser line energy on welding strength of PASF/PC using magnesium zinc alloy powders as absorbents in laser transmission welding","authors":"Xiaodong Yu, Chenyi Ni, Haiyu Qiao, Yani Chen, Yayun Liu, Chuanyang Wang","doi":"10.1016/j.optlastec.2024.110702","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110702","url":null,"abstract":"The metal powder absorbents have the advantage of fabricating clean and high-strength joints in the process of laser transmission welding dissimilar transparent thermoplastics. However, the joining behavior between metal powders and thermoplastics is vague. Herein, polyarylsulfone (PASF) and polycarbonate (PC) are selected as model materials to investigate the joining behavior using magnesium zinc alloy (MZA) powders at different laser line energies. The shear force test was performed to reveal the effect of laser line energy on the welding. The µ-CT images reveal the evaluation of welding strength is attributed to the specific joint morphology. The multi-scale morphology characterization shows that the fractured surface height increases with increasing the laser line energy. The voids between MZA powders and resins increase the risks of interface failure, and the bubbles in the resins increase the risks of cohesion failure. The effects of laser line energy on the joint characteristics are elaborated based on the thermo-physical property test and transient temperature field analysis. The above results indicate the optimized welding temperature locates the melting temperature of PASF, because of the good fusion of PASF and less decomposition of PC. The study can provide a guideline for choosing proper process parameters when choosing metal powders as laser absorbents in welding dissimilar transparent thermoplastics.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tailoring the microstructure of Fe-2.9wt.%Si alloy in laser powder bed fusion using in-source beam shaping 在激光粉末床熔化中使用源内光束整形技术定制 Fe-2.9wt.%Si 合金的微观结构

Optics & Laser Technology Pub Date : 2024-02-12 DOI: 10.1016/j.optlastec.2024.110649

Francesco Galbusera, Leonardo Caprio, Barbara Previtali, Ali Gökhan Demir

引用次数: 0

Recoding double-phase holograms with the full convolutional neural network 用全卷积神经网络重新编码双相全息图

Optics & Laser Technology Pub Date : 2024-02-12 DOI: 10.1016/j.optlastec.2024.110667

Xingpeng Yan, Xinlei Liu, Jiaqi Li, Hairong Hu, Min Lin, Xi Wang

{"title":"Recoding double-phase holograms with the full convolutional neural network","authors":"Xingpeng Yan, Xinlei Liu, Jiaqi Li, Hairong Hu, Min Lin, Xi Wang","doi":"10.1016/j.optlastec.2024.110667","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110667","url":null,"abstract":"Herein, we proposed a method to recode double-phase holograms (DPHs) with a full convolutional neural network (FCN) for alleviating the fringes and spatial shifting noises in that. There are many fringes near the edge of the diffraction field due to the incomplete Fresnel zone plate, and the pixel-by-pixel encoding method of DPH will cause above fringes to appear in the reconstructed image of that as well. Besides, the spatial shifting noises generated during the conversion from complex-amplitude information to pure-phase information will also decrease the reconstruction quality and definition. Depending on the great nonlinear fitting ability of FCN, the proposed method can recode DPHs, alleviating the fringes and removing the spatial shifting noises effectively. Finally, the phase-only holograms with the resolution 2400 × 4096 have been generated in 0.06 s, which have a peak signal to noise ratio (PSNR) of 35.6 dB in the mean reconstruction quality. Optical results showed that compared with the conventional methods, the target images reconstructed by the proposed method have less noise and a higher display quality.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"179 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of processing parameters on formability of Ti6Al4V at constant volumetric energy density by laser powder bed fusion 加工参数对激光粉末床熔融技术恒定体积能量密度下 Ti6Al4V 成形性的影响

Optics & Laser Technology Pub Date : 2024-02-10 DOI: 10.1016/j.optlastec.2024.110683

Zhijun Zhang, Zhenhua Li, Bei Wang, Changyi Yang, Chengjian Wang, Ning Wang

{"title":"Effect of processing parameters on formability of Ti6Al4V at constant volumetric energy density by laser powder bed fusion","authors":"Zhijun Zhang, Zhenhua Li, Bei Wang, Changyi Yang, Chengjian Wang, Ning Wang","doi":"10.1016/j.optlastec.2024.110683","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110683","url":null,"abstract":"Volumetric energy density establishes connections among crucial process parameters, such as laser power, scanning speed, layer thickness, hatch spacing, etc., in laser powder bed fusion processing. The impact of laser power and scanning speed on the melt pool shape, surface morphology, porosity, and microstructure of the as-built samples was investigated while maintaining a constant volumetric energy density. At a constant VED, the depth of the melt pool progressively deepens with increasing laser power, while concurrently, the width of the melt pool tends to diminish. With a laser power of 170 W, the height of the melt pool approaches the layer thickness of 40.0 μm, providing adequate overlap between the two layers. Adequate melt pool height ensures the prevention of incomplete fusion holes and guarantees sample densification. The root width of the melt pool was 41.0 μm and 63.2 μm for laser powers of 100 W and 170 W, respectively. Insufficient overlap between melt pools leads to unfused holes, the primary cause of increased specimen porosity. Distinct processing parameters result in varying times and types of thermal cycles, significantly influencing the degree of refinement of α′-acicular martensite.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"2020 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coherent all-optical reservoir computing for nonlinear equalization in long-haul optical fiber communication systems 用于长途光纤通信系统非线性均衡的相干全光存储计算

Optics & Laser Technology Pub Date : 2024-02-10 DOI: 10.1016/j.optlastec.2024.110697

Guanju Peng, Yaping Liu, Zheng Li, Kunpeng Zhu, Zhiqun Yang, Jianping Li, Shigui Zhang, Zhanhua Huang, Lin Zhang

引用次数: 0