Optics & Laser Technology最新文献_第10页

CW laser-assisted splitting of SiC wafer based on modified layer by picosecond laser 基于皮秒激光修饰层的 CW 激光辅助碳化硅晶片分裂

Optics & Laser Technology Pub Date : 2024-02-10 DOI: 10.1016/j.optlastec.2024.110700

Lu Jiang, Shusen Zhao, Shifei Han, Han Liang, Jiabao Du, Haijuan Yu, Xuechun Lin

{"title":"CW laser-assisted splitting of SiC wafer based on modified layer by picosecond laser","authors":"Lu Jiang, Shusen Zhao, Shifei Han, Han Liang, Jiabao Du, Haijuan Yu, Xuechun Lin","doi":"10.1016/j.optlastec.2024.110700","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110700","url":null,"abstract":"Silicon carbide (SiC), the third-generation semiconductor material, is important in developing electronic power devices. Compared to wire sawing technology, Laser splitting SiC is an efficient way to produce SiC wafers with reduced material loss. In this work, we propose a new method of continuous wave (CW) laser-assisted splitting of SiC wafer based on modified layer by picosecond laser. For the process of CW laser irradiation on the modified layer, thermal–mechanical numerical simulations were performed to calculate the temperature and stress fields during laser loading. The mechanism of CW laser-assisted SiC wafer splitting was analyzed to guide the selection of CW laser parameters. The microstructure, element distribution, and stress state of the split SiC wafer surface were investigated and analyzed. The results showed that laser processing did not affect the crystal structure and carrier concentration of SiC. Compressive stress was generated on the splitting surface. Polycrystalline carbon and single crystalline silicon appeared on the splitting surface with a 50-250 nm thickness. The layer with compressive stress and polycrystalline microstructures can be removed after grinding and polishing.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922507","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

All-optical compensation strategy for high-sensitive and precise rotating velocimetry of a multi-pose target 用于多目标高灵敏度和精确旋转测速的全光学补偿策略

Optics & Laser Technology Pub Date : 2024-02-10 DOI: 10.1016/j.optlastec.2024.110712

Yanxiang Zhang, Zijing Zhang, Qingfeng Wang, Yuan Zhao

{"title":"All-optical compensation strategy for high-sensitive and precise rotating velocimetry of a multi-pose target","authors":"Yanxiang Zhang, Zijing Zhang, Qingfeng Wang, Yuan Zhao","doi":"10.1016/j.optlastec.2024.110712","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110712","url":null,"abstract":"Rotational Doppler velocimetry holds immense potential for practical applications. However, the sensitivity and precision of existing systems are restricted by the broadening of rotational Doppler spectrum caused by the varied postures of a rotating target surface. Herein, we present and attest to an all-optical compensation scheme for the first time capable of overcoming this restriction, based upon the optical rotational Doppler effect and the eigenmode superposition and decomposition principle. It relies on the iterative compensations of broadening intramode phase differences between aligned and misaligned surfaces into the orbital-angular-momentum phase spectrum of emitted light field, correspondingly. In contrast to uncompensated situations, our demonstrated system can not only achieve the considerable improvement of signal-to-noise ratio up to roughly orders of magnitude and reduce the relative error below 1.5% under a certain offsets and rotating velocity range, which thus highlights the establishment of a high-sensitive and precise pathway for rotating velocimetry of a multi-pose target. The validated approach and findings may be applied in various real-world spinning scenarios, such as astronomical observations, industrial manufacturing and in-vivo biomedical engineering.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"139 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922508","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

Defect-initiated formation mechanism of 3D carbon tracks on flexible transparent substrates by laser irradiation 通过激光照射在柔性透明基底上形成三维碳轨道的缺陷引发机制

Optics & Laser Technology Pub Date : 2024-02-10 DOI: 10.1016/j.optlastec.2024.110686

Shuichiro Hayashi, Xiaohan Du, Marco Rupp, Kai A. Filsinger, Mitsuhiro Terakawa, Craig B. Arnold

{"title":"Defect-initiated formation mechanism of 3D carbon tracks on flexible transparent substrates by laser irradiation","authors":"Shuichiro Hayashi, Xiaohan Du, Marco Rupp, Kai A. Filsinger, Mitsuhiro Terakawa, Craig B. Arnold","doi":"10.1016/j.optlastec.2024.110686","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110686","url":null,"abstract":"Laser direct writing of 3D carbon structures onto flexible polymer substrates offers potential of rapid roll-to-roll manufacturing for a variety of key applications, including large area sensors, flexible electronics, robotics, energy storage/conversion, and other consumer applications. The specific formation mechanism of the carbon structures has been an issue of debate for many years with the prevailing notion of a simple photothermal conversion reaction that mainly depends on the total energy input. However, this view has been shown to be inconsistent with experimental observations of nonlinear changes in the resulting structures when multiple processing parameters are simultaneously changed. In this study, we propose a formation mechanism based on the nucleation and growth of laser-induced defects, which is experimentally validated by irradiating a continuous wave laser beam onto polydimethylsiloxane. The model is further validated by intentionally introducing controlled defects by femtosecond laser irradiation, and indicate the implications of a two-laser laser direct writing technique to go beyond the current processing limits. These results clarify the previously ambiguous mechanisms by which carbon structures form under laser irradiation and provide a deeper understanding of how to control photothermal processes for advanced material processing.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922715","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

Investigation on ablative process of CFRP laminates under laser irradiations 激光辐照下 CFRP 层压材料烧蚀过程的研究

Optics & Laser Technology Pub Date : 2024-02-10 DOI: 10.1016/j.optlastec.2024.110687

Qingfeng Chai, Yongkang Luo, Xuehai Qian, Yu Zhang, Lv Zhao

引用次数: 0

Optical behavior of glasses containing gold nanoparticles: A review 含有金纳米粒子的玻璃的光学特性：综述

Optics & Laser Technology Pub Date : 2024-02-10 DOI: 10.1016/j.optlastec.2024.110675

Shivani Singla, Basant Lal, Jatinder Kaur, Gopi Sharma

引用次数: 0

Surface defect detection from additive manufacturing components at elevated temperatures using laser-generated Rayleigh waves 利用激光产生的瑞利波检测高温下增材制造部件的表面缺陷

Optics & Laser Technology Pub Date : 2024-02-10 DOI: 10.1016/j.optlastec.2024.110690

Shuai Chen, Haitao Wang, Yi Jiang, Xiaoling Zhang, Kai Zheng, Shifeng Guo, Xianming Yang, Dehai Huang, Binding Hu

引用次数: 0

Fine optimization of aberration compensation for stealth dicing 隐形切割的像差补偿精细优化

Optics & Laser Technology Pub Date : 2024-02-10 DOI: 10.1016/j.optlastec.2024.110668

Shi Qiao, Jingpei Hu, Yinyin Wei, Aijun Zeng, Huijie Huang

引用次数: 0

Formation and suppression mechanism of wavy edge in oscillating laser-arc hybrid fillet welding of aluminum alloy 铝合金振荡激光-电弧混合角焊波状边缘的形成与抑制机理

Optics & Laser Technology Pub Date : 2024-02-09 DOI: 10.1016/j.optlastec.2024.110691

Laihege Jiang, Ling Cen, Suning Zhao, Dafeng Wang, Ming Gao

{"title":"Formation and suppression mechanism of wavy edge in oscillating laser-arc hybrid fillet welding of aluminum alloy","authors":"Laihege Jiang, Ling Cen, Suning Zhao, Dafeng Wang, Ming Gao","doi":"10.1016/j.optlastec.2024.110691","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110691","url":null,"abstract":"The weld surface characteristics of aluminum alloy fillet joints play a pivotal role in determining their performance. To enhance surface quality, oscillating laser-arc hybrid fillet welding was employed for aluminum alloy, along with a focus on the effect of beam oscillation on weld surface formation. Results revealed that a distinctive surface defect in aluminum alloy fillet welding manifested as a wavy edge on the main plate at oscillation frequencies () of 0 and 50 Hz. When ≥ 150 Hz, the wavy weld edge was effectively suppressed. As a result, the tensile fracture location in the defect-free joint transferred from the main plate to the rib plate. The corresponding ultimate tensile strength reached 282.3 MPa, signifying a substantial 160.1 % improvement. Analysis indicated that the high-speed vortex generated by laser oscillation was the decisive factor in suppressing the wavy edge. This effect eliminated the depressed edge of the molten pool and mitigated droplet impact. Ultimately, a comprehensive examination of the forces acting on the molten pool unveiled the formation and suppression mechanism of the wavy edge. These insightful findings carry significant implications for enhancing the aluminum alloy fillet welding process and deepening comprehension of weld surface formation.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"26 4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922510","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

Design of parabolic refractive index 2 mode-EDFA with ultra-low deviation in gain and noise figure across 2 × 16 channels for MDM-WDM system 为 MDM-WDM 系统设计抛物线折射率 2 模式EDFA，其 2 × 16 信道的增益和噪声系数偏差超低

Optics & Laser Technology Pub Date : 2024-02-09 DOI: 10.1016/j.optlastec.2024.110693

Suhail K. Naik, Ifrah Amin, Gausia Qazi

引用次数: 0

Influences of laser profiles on the weld quality of glass fiber reinforced PBT using laser transmission welding 使用激光透射焊接玻璃纤维增强型 PBT 时，激光轮廓对焊接质量的影响

Optics & Laser Technology Pub Date : 2024-02-09 DOI: 10.1016/j.optlastec.2024.110672

Yani Chen, Haiyu Qiao, Qian Li, Xiaodong Yu, Chuanyang Wang

{"title":"Influences of laser profiles on the weld quality of glass fiber reinforced PBT using laser transmission welding","authors":"Yani Chen, Haiyu Qiao, Qian Li, Xiaodong Yu, Chuanyang Wang","doi":"10.1016/j.optlastec.2024.110672","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110672","url":null,"abstract":"Laser transmission welding (LTW) plays an important role in plastic connection for fabricating large and complex products. The laser profile as a key parameter determines the spatial energy distribution, affecting the temperature gradient of the welding path and the quality of the weld seam. In this study, the effect of two laser profiles, the Gaussian and Flat-top beams on the temperature field and weld quality was studied through experiments and simulation. First, the transmission behavior of the laser beams is studied through the spectrometer and photosensitive paper, revealing the laser spot energy distribution and spatial changes after passing through the laser-transparent layer. Furthermore, the tensile force test demonstrated that the weld seam prepared by the Gaussian beam present higher tensile force, with a tensile force of 634.18 N at the line density of 11.2 J/mm, 24.23 % higher than that of the Flat-top beam. Moreover, the simulation result from the finite element model found that the maximum welding temperature of the Flat-top beam is 39.42 % higher than that of the Gaussian beam, consistent with the results of morphological and mechanical results. This study might present a potential way for selecting the laser profile in LTW, further improving weld quality through optimizing process windows.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922518","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