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Journal of Laser Micro Nanoengineering最新文献

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Femtosecond Laser Ablation in Burst Mode as a Function of Pulse Fluence and Intra-Burst Repetition Rate 脉冲模式下飞秒激光消融与脉冲通量和脉冲内重复率的关系
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-12-01 DOI: 10.2961/jlmn.2020.03.2014
N. Hodgson, Hortense Allégre, Andrei Starodoumov
{"title":"Femtosecond Laser Ablation in Burst Mode as a Function of Pulse Fluence and Intra-Burst Repetition Rate","authors":"N. Hodgson, Hortense Allégre, Andrei Starodoumov","doi":"10.2961/jlmn.2020.03.2014","DOIUrl":"https://doi.org/10.2961/jlmn.2020.03.2014","url":null,"abstract":"Ablation rates were measured in burst mode operation for various materials (metals, semiconductors, dielectrics) as a function of pulse fluence, intra-burst repetition rate (60 MHz, 180 MHz, 360 MHz, 720 MHz, 1.44 GHz) and the number of pulses per burst (1-30), using a 40 µJ, 1035 nm Yb:Fiber MOPA with 300 fs pulse duration and repetition rates between 100 and 250 kHz. Burst mode operation allows operation near the optimum fluence for laser ablation, thus maximizing the ablation rate. Depending on the material, number of pulses in the burst, intra-burst repetition rate and the ablation geometry, the ablation efficiency can be equal, lower or multiple times higher compared to non-burst operation. For metals and large area ablation, burst mode operation enables ac-cess to the maximum ablation rate by using more than 5 pulses per burst. Intra-burst repetition rates higher than 180 MHz, or using less than 5 pulses usually leads to a decrease in ablation efficiency due to shielding by the ejected material/plasma. For materials with low thermal conductivity, like glasses or plastics, and for semiconductors materials, interaction between burst pulses can substan-tially increase the maximum ablation rate over the 1-pulse case, leading to more efficient ablation as the number of burst pulses and the intra-burst frequencies are increased.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43264366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Improved Efficiency of an Adaptive Beam-Shaping Technique Based on Phase Gratings and Spatial Frequency Filtering 基于相位光栅和空间频率滤波的自适应波束成形技术的改进效率
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-12-01 DOI: 10.2961/jlmn.2020.03.2013
Y. Nakata, Y. Hirakawa, Tsubasa Morizuka, Y. Kosaka, N. Miyanaga, Kazuhito Osawa
{"title":"Improved Efficiency of an Adaptive Beam-Shaping Technique Based on Phase Gratings and Spatial Frequency Filtering","authors":"Y. Nakata, Y. Hirakawa, Tsubasa Morizuka, Y. Kosaka, N. Miyanaga, Kazuhito Osawa","doi":"10.2961/jlmn.2020.03.2013","DOIUrl":"https://doi.org/10.2961/jlmn.2020.03.2013","url":null,"abstract":"Flattop beam shapes are in high demand for various laser applications, including ultra-high-power laser systems and surface processing, which includes interference laser processing and medical treatment. In this study, we report on the improvement of extraction efficiency in a beam shaping method using phase gratings and spatial frequency filtering. By organising the phase grating vector kkgg unparallel to the normal vectors kknn of the sides of an aimed polygonal beam shapes, which are square and hexagonal in this study, the high-spatial frequency component is maintained in the spatial frequency filtering process, and high-quality beam shaping with good flatness and edge steepness can be obtained. In addition, the extraction efficiency of polygon-shaped beams from a Gaussian beam or flattop circular beam is discussed.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46431139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Gradient and Core-Cladding Waveguides Fabrication in Porous Glass 多孔玻璃中梯度包芯波导的制备
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-12-01 DOI: 10.2961/jlmn.2020.03.2016
{"title":"Gradient and Core-Cladding Waveguides Fabrication in Porous Glass","authors":"","doi":"10.2961/jlmn.2020.03.2016","DOIUrl":"https://doi.org/10.2961/jlmn.2020.03.2016","url":null,"abstract":"","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46313339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Surface Modification of Forming Tools for Aluminum Sheet Metal Forming 铝板成形工具的表面改性
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-06-01 DOI: 10.2961/jlmn.2020.01.2009
Florian Kuisat, T. Abraham, T. Schmidt, M. Weber, M. Demmler, G. Bräuer, A. Lasagni
{"title":"Surface Modification of Forming Tools for Aluminum Sheet Metal Forming","authors":"Florian Kuisat, T. Abraham, T. Schmidt, M. Weber, M. Demmler, G. Bräuer, A. Lasagni","doi":"10.2961/jlmn.2020.01.2009","DOIUrl":"https://doi.org/10.2961/jlmn.2020.01.2009","url":null,"abstract":"It is known that surface patterns and coating systems can affect the flow behavior of forming tools. In this context, we report about the surface modification of forming tool steels for aluminum sheet metal forming process. Microstructures with variable spatial periods and depths are fabricated on tool steel samples using the direct laser interference patterning method. A picosecond-pulsed infrared laser source with a two-beam interference setup is applied for producing line-like structures. In addition, a diamond like carbon (DLC) coating system is deposited on the structured surfaces. To improve the adhesion tendency of the DLC coating, also different plasma nitriding parameters are examined. According to the results, a broad spectrum of different coating-structure combinations can be efficiently processed, which can optimize the tribological properties of the forming tool for aluminum forming applications.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46557745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","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 Scan Strategy on Mechanical Properties of AlSi12 Lattice Fabricated by Selective Laser Melting 扫描策略对选择性激光熔化AlSi12晶格力学性能的影响
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-06-01 DOI: 10.2961/jlmn.2020.01.2002
M. Sairaiji, H. Yoshizaki, H. Iwaoka, S. Hirosawa, S. Maruo
{"title":"Effect of Scan Strategy on Mechanical Properties of AlSi12 Lattice Fabricated by Selective Laser Melting","authors":"M. Sairaiji, H. Yoshizaki, H. Iwaoka, S. Hirosawa, S. Maruo","doi":"10.2961/jlmn.2020.01.2002","DOIUrl":"https://doi.org/10.2961/jlmn.2020.01.2002","url":null,"abstract":"In this study, the influence of scan strategies, such as scan order and scan patterns, on compressive load capacity was investigated for the aluminum alloy AlSi12-made lattice structures fabricated by selective laser melting. The scan order of concentric scan patterns affected compressive load capacity. Better mechanical properties were obtained when the scan order was set from the outside. Setting the scan order from the inside caused coarsening of the grains at the center of the strut, thus worsening the mechanical properties due to the reduced area fraction of the finegrained regions. The mechanism of such grain coarsening was explained based on the heat transfer direction. Furthermore, the scan pattern also affected the size and orientation of the grains in the lower zone of the strut as well as its geometrical accuracy. A stripe pattern with a rotation of 67° from layer to layer decreased the geometrical accuracy but increased the hardness of the strut owing to the smaller size and random orientation of the grains in the lower strut zone.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48713502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Ultra-Short Pulsed Laser Marking and Coloration of Metals with Segmented Pixel Parameter Transformation 基于分割像素参数变换的金属超短脉冲激光打标与着色
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-06-01 DOI: 10.2961/jlmn.2020.01.2001
Norbert Ackerl, P. Gugger, Maximilian Warhanek, J. Gysel, K. Wegener
{"title":"Ultra-Short Pulsed Laser Marking and Coloration of Metals with Segmented Pixel Parameter Transformation","authors":"Norbert Ackerl, P. Gugger, Maximilian Warhanek, J. Gysel, K. Wegener","doi":"10.2961/jlmn.2020.01.2001","DOIUrl":"https://doi.org/10.2961/jlmn.2020.01.2001","url":null,"abstract":"Ultra-short pulsed laser modification points to novel coloration possibilities on a broad range of materials using laser induced periodic surface structures, plasmonic nanoparticles, and thermal oxidation as principles. Here, a general parameter-dependent laser path calculation routine for marking and coloration of complex images is presented. The original image is imported, dependent on size and resolution, down sampled and dithering applied. The color map attained from a laser parameter study is registered and the computer-aided manufacturing routine maps the color space to nearest neighbors of the original image. Thereafter, the laser paths with the adjacent parameters are computed and the numerical code generated. A complex colored pixel graphic is transformed and high-contrast marked in black and grey-scale on a stainless steel plate. Moreover, to demonstrate the capabilities, a titanium alloy is ultra-short pulsed laser colored. A colorful image proves this approach with a pixel size of below 40 μm and no observable cross talk between the colors.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42644410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Research on Maskless Lithography System Based on Digital Oblique Scanning Strategy 基于数字斜扫描策略的无掩模光刻系统研究
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-06-01 DOI: 10.2961/jlmn.2020.01.2008
S. Huang, M. Li, L. Wang, Y. Su, F. Wang
{"title":"Research on Maskless Lithography System Based on Digital Oblique Scanning Strategy","authors":"S. Huang, M. Li, L. Wang, Y. Su, F. Wang","doi":"10.2961/jlmn.2020.01.2008","DOIUrl":"https://doi.org/10.2961/jlmn.2020.01.2008","url":null,"abstract":"In this paper, based on the scanning lithography imaging principle of digital micromirror devices (DMD), an oblique scanning lithography strategy was proposed, and successfully used in the maskless lithography system. During the design and construction of the system, ZEMAX optical lighting system design, non-sequential simulation optimization analysis, pulse width modulation and other methods were adopted comprehensively which can effectively improve the lithography quality. The experimental results showed that this lithography system can successfully fabricate large-area linear grating pattern with a resolution of 0.8 μm, which can effectively make up for the quantization error and other defects existing in the current maskless lithography system, and will have a broad application prospect in fabricating large-area, high-precision micro-nano structures.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47286511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
High-Precision Surface Profiling Using Multi-Hundred Watts Ultrashort Pulse Lasers and Ultrafast Polygon-Mirror Based Scanner 利用数百瓦超短脉冲激光器和基于超快多边形镜的扫描仪进行高精度表面轮廓分析
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-06-01 DOI: 10.2961/jlmn.2020.01.2004
S. Mauersberger, J. Schille, Kristian Kujawa, L. Schneider, C. Million, Konrad M. Hartung, K. Oehlert, U. Loeschner
{"title":"High-Precision Surface Profiling Using Multi-Hundred Watts Ultrashort Pulse Lasers and Ultrafast Polygon-Mirror Based Scanner","authors":"S. Mauersberger, J. Schille, Kristian Kujawa, L. Schneider, C. Million, Konrad M. Hartung, K. Oehlert, U. Loeschner","doi":"10.2961/jlmn.2020.01.2004","DOIUrl":"https://doi.org/10.2961/jlmn.2020.01.2004","url":null,"abstract":"High-precision surface profiling is studied by using ultrashort pulse lasers up to 450 W laser powers and 40 MHz maximum pulse repetition frequency. A polygon-mirror based scan system is applied for ultrafast and flexible laser beam raster scanning providing up to 560 m/s laser beam moving speeds. By investigating the high-average power picosecond and femtosecond laser systems in large-area processing, optimum parameter settings are derived with regard to machining quality, efficiency and throughput. In addition, the influence of the focus spot size on top width and tip angle of trapezoidal micro structures (Riblets) is evaluated. Inspired by bionic surface functionalities, the laser made Riblets are tested in a Goettingen-type wind tunnel to identify their effectiveness for aerodynamic drag reduction in turbulent flows. For the optimum Riblet geometries, a maximum total pressure loss reduction of 1.76% is achieved that is remarkable when comparing with literature data. The drag reducing effect of the Riblets is further confirmed by empirical-analytical and CFD analyses showing up to 6.4% skin friction reduction. By taking into account the effective processing time of 6.0 cm2/min with potential to be further scaled-up with higher laser powers, ultrafast laser-based Riblet profiling could be a key enabling technology to enhance the operational performance in the energy machinery sector.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47319907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Laser Powder Bed Fusion of Multilayer Thin-walled Structures Based on Data-driven Model 基于数据驱动模型的多层薄壁结构激光粉末床熔合
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-06-01 DOI: 10.2961/jlmn.2020.01.2007
An-Chen Lee, Ruei-Yu Huang, Trong Doan Nguyen, Chung-Wei Cheng, M. Tsai
{"title":"Laser Powder Bed Fusion of Multilayer Thin-walled Structures Based on Data-driven Model","authors":"An-Chen Lee, Ruei-Yu Huang, Trong Doan Nguyen, Chung-Wei Cheng, M. Tsai","doi":"10.2961/jlmn.2020.01.2007","DOIUrl":"https://doi.org/10.2961/jlmn.2020.01.2007","url":null,"abstract":"The laser powder bed fusion (LPBF) process has the advantage of directly building metal parts with complex geometries and lattice structures. The lattice structures are usually composed of different thin-walled structures. Therefore, precise control over the shape of structures on the LPBF fabricated lattice structures is important. In this study, a symbolic regression solution that describes the relationship between scan track width and process parameters (laser power and scanning velocity) is generated by empirical data. This regression model is then implemented into the control scheme that stabilizes the structure width for single-layer and multilayer thin-walled structures. The experiment results showed that the average errors for the single-layer track with desired width from 120 μm to 180 μm are all under 5%, and the average error for the ten-layered structures with desired width 180 μm is about 2.2%.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":"296 1","pages":"38-44"},"PeriodicalIF":1.1,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79588068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Femtosecond Laser Drilling of Copper: Modeling and Experiment Comparison 飞秒激光钻铜:建模与实验比较
IF 1.1 4区 材料科学
Journal of Laser Micro Nanoengineering Pub Date : 2020-06-01 DOI: 10.2961/jlmn.2020.01.2005
Yi Liu, Chung-Wei Cheng, J. Chen
{"title":"Femtosecond Laser Drilling of Copper: Modeling and Experiment Comparison","authors":"Yi Liu, Chung-Wei Cheng, J. Chen","doi":"10.2961/jlmn.2020.01.2005","DOIUrl":"https://doi.org/10.2961/jlmn.2020.01.2005","url":null,"abstract":"This study experimentally and theoretically investigated the ablation of copper by a femtosecond green laser pulse of wavelength 515 nm and pulse duration 300 fs. The copper was processed by a single laser pulse with fluences up to 789 J/cm2. A modified Drude-critical point (DCP) model that considers the temperature-dependent inter-band transition, a two-temperature model (TTM), two phase change models, and a phase explosion model were adopted to obtain the temperature-dependent properties and ablation depth. The simulated ablation depths by the proposed DCP-mod method were in better agreement with the experimental results than those by the conventional DCP model.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":"71 1","pages":"25-30"},"PeriodicalIF":1.1,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90950587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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