Статті в журналах: "Laser manufacturing"

1

SOZON, Tsopanos. "Laser Additive Manufacturing (LAM)." JOURNAL OF THE JAPAN WELDING SOCIETY 83, no. 4 (2014): 266–69. http://dx.doi.org/10.2207/jjws.83.266.

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2

Kuriyagawa, Tsunemoto, and Masayoshi Mizutani. "Special Issue on Laser-Based/Assisted Manufacturing." International Journal of Automation Technology 14, no. 4 (July 5, 2020): 533. http://dx.doi.org/10.20965/ijat.2020.p0533.

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Анотація:

The “process chain” concept for the integration of multiple manufacturing processes has been attracting attention in the field of manufacturing in recent years. In a number of specialized fields, laser-based processes in particular are actively being studied, as their high flexibility allows them to be used not only as individual manufacturing processes but also in combination to develop new ones. Most of the practical laser technologies involve heat, which can be used for thermal processing to change surface properties or for removal processing. In recent years, lasers have also been used as a heat source for additive manufacturing, as well as ultra-short-pulsed lasers being applied to non-thermal processes. This special issue features various studies and reports that present the latest advances as well as current challenges in laser-based/assisted manufacturing. It includes nine related papers that indicate the possibilities and future of new laser processing technologies. We deeply appreciate all the authors and reviewers for their efforts and contributions, and we also hope this special issue will encourage further research on laser-based/assisted manufacturing.

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3

Kaligar, Atiq Basha, Hemnath Anandan Kumar, Asghar Ali, Wael Abuzaid, Mehmet Egilmez, Maen Alkhader, Farid Abed, and Ali Sami Alnaser. "Femtosecond Laser-Based Additive Manufacturing: Current Status and Perspectives." Quantum Beam Science 6, no. 1 (January 18, 2022): 5. http://dx.doi.org/10.3390/qubs6010005.

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The ever-growing interest in additive manufacturing (AM) is evidenced by its extensive utilisation to manufacture a broad spectrum of products across a range of industries such as defence, medical, aerospace, automotive, and electronics. Today, most laser-based AM is carried out by employing continuous-wave (CW) and long-pulsed lasers. The CW and long-pulsed lasers have the downside in that the thermal energy imparted by the laser diffuses around the irradiated spot and often leads to the creation of heat-affected zones (HAZs). Heat-affected zones may degrade the material strength by producing micro-cracks, porous structures and residual stresses. To address these issues, currently, attempts are being made to employ ultrafast laser sources, such as femtosecond (fs) lasers, in AM processes. Femtosecond lasers with pulse durations in the order of 10−15 s limit the destructive laser–material interaction and, thus, minimise the probability of the HAZs. This review summarises the current advancements in the field of femtosecond laser-based AM of metals and alloys. It also reports on the comparison of CW laser, nanosecond (ns)/picosecond (ps) lasers with fs laser-based AM in the context of heat-affected zones, substrate damage, microstructural changes and thermomechanical properties. To shed light on the principal mechanisms ruling the manufacturing processes, numerical predictions are discussed and compared with the experimental results. To the best of the authors’ knowledge, this review is the first of its kind to encompass the current status, challenges and opportunities of employing fs lasers in additive manufacturing.

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4

Bogue, Robert. "Lasers in manufacturing: a review of technologies and applications." Assembly Automation 35, no. 2 (April 7, 2015): 161–65. http://dx.doi.org/10.1108/aa-07-2014-066.

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Purpose – This paper aims to provide details of the role that lasers play in manufacturing processes. Design/methodology/approach – Following an introduction, this paper first considers laser technologies used in welding, cutting and drilling. Techniques which add material or modify material’s properties, namely, pulsed laser deposition, laser cladding, heat treatment and laser peening are then discussed. A number of specific applications are cited and finally, brief conclusions are drawn. Findings – This paper shows that many laser-based processes are used to conduct a range of critical functions in the automotive, electronics, aerospace, power generation, medical and other industries. Originality/value – This paper illustrates the importance of lasers in a diversity of manufacturing processes.

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5

Deininger, Christoph. "Orbital Laser Manufacturing." Laser Technik Journal 12, no. 5 (November 2015): 37–40. http://dx.doi.org/10.1002/latj.201500034.

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6

Gillner, Arnold. "Laser Micro Manufacturing." Laser Technik Journal 6, no. 1 (January 2009): 16–19. http://dx.doi.org/10.1002/latj.200990001.

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7

Gasser, Andres, Gerhard Backes, Ingomar Kelbassa, Andreas Weisheit, and Konrad Wissenbach. "Laser Additive Manufacturing." Laser Technik Journal 7, no. 2 (February 2010): 58–63. http://dx.doi.org/10.1002/latj.201090029.

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8

Wu, Yuxiang, Yongxiong Chen, Lingchao Kong, Zhiyuan Jing, and Xiubing Liang. "A Review on Ultrafast-Laser Power Bed Fusion Technology." Crystals 12, no. 10 (October 18, 2022): 1480. http://dx.doi.org/10.3390/cryst12101480.

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Additive manufacturing of metals by employing continuous wave and short pulse lasers completely changes the way of modern industrial production. But the ultrafast laser has the superiority to short pulse laser and continuous wave laser in additive manufacturing. It has higher peak power, small thermal effect, high machining accuracy and low damage threshold. It can effectively perform additive manufacturing for special materials and improve the mechanical properties of parts. This article reviews the mechanism of the interaction between ultrafast laser and metal materials to rule the manufacturing processes. The current application of ultrafast laser on forming and manufacturing special materials, including refractory metals, transparent materials, composite materials and high thermal conductivity materials are also discussed. Among the review, the shortcomings and challenges of the current experimental methods are discussed as well. Finally, suggestions are provided for the industrial application of ultrashort pulse laser in the field of additive manufacturing in the future.

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9

Ting, Ben, and Vincent P. Manno. "Transient Thermomechanical Simulation of Laser Hammering in Optoelectronic Package Manufacturing." Journal of Electronic Packaging 127, no. 3 (November 1, 2004): 299–305. http://dx.doi.org/10.1115/1.1938206.

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Laser hammering (LH) is a process used in the manufacturing of butterfly optoelectronic packages to correct laser-to-fiber misalignment that occurs when the semiconductor lasers are welded in place. High-power, precisely positioned pulsed lasers are used in LH to induce deformation of the fiber support housing to, in turn, induce realignment. A thermomechanical modeling study of LH is reported in this paper, which focuses on the degree to which a steady-state model can predict the asymptotic state of a transient response subjected to a periodic laser excitation. A baseline, two-dimensional fiber mounting/ferrule geometry is employed in a finite element analysis simulation case study. Various laser wave forms are applied to focus spot location sizes of 50 and 200μm over a range of applied heat fluxes (10-1000W∕mm2). Effects of laser energy deposition location, as well as the use of multiple lasers, are also studied. The results show that the steady-state solution is in good agreement with the asymptotic transient response for horizontal fiber displacement and fiber temperature. The laser focus spot surface temperature predictions are also found to be in reasonable agreement. However, the vertical fiber displacement tends to be overpredicted by the steady-state solution, sometimes by as much as an order of magnitude. The causes, both physical and computational, of this disagreement are discussed.

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10

Parshin, V. A., V. V. Bliznyuk, and A. V. Dolgov. "Polarization stability of the single-mode laser diodes radiation applied in radiation scattering study complexes." Journal of Physics: Conference Series 2127, no. 1 (November 1, 2021): 012040. http://dx.doi.org/10.1088/1742-6596/2127/1/012040.

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Abstract Key features of semiconductor lasers and its serially manufacturing technology modernization have greatly expanded of its using at applied studies at last 20 years. But there is set of factors restricting such lasers application in a number of optical-electronic measuring complexes. Particularly in particle image velocimetry (PIV) and laser Doppler velocimetry (LDV) complexes commonly the gas and solid-state lasers is used due to more stability of spectral, energy and polarization characteristics of radiation then semiconductor lasers have. However gradual introduction of the serially manufacturing laser diodes into such systems picking up the pace that certainly characterizes the progress of reaching the required stability of its output laser radiation parameters. In laser measurement systems where medium investigation carried out by analyzing of scattering radiation in it the probe radiation polarization is often important. So the using in such systems the laser diodes as sources of radiation need to be followed by stability monitoring of its polarization characteristics which may be violated both by the outer factors and by natural degradation of inner laser diode structure. This work is devoted to the issues of monitoring the radiation polarization characteristics of the serially manufacturing single-mode laser diodes.

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11

Zhang, Kai, Xiao Feng Shang, and Lei Wang. "Laser Transmission Technology of Laser Additive Manufacturing." Applied Mechanics and Materials 380-384 (August 2013): 4315–18. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.4315.

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The laser additive manufacturing technology is a laser assisted direct metal manufacturing process. This process offers the ability to make a metal component directly from CAD drawings. The manufacturing equipment consists of some components. Among them, the laser transmission component plays an important role in the whole fabricating process. It provides the energy source to melt the metal powder, so it is necessary to develop the laser transmission technology. This technology is achieved primarily by laser generator system and optical path transmission system. The related structure design and function implementation prove that the laser transmission technology can generate desirable laser power at precise assigned position, and complete the manufacturing process with flying colors.

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12

Muhammad, Noorhafiza, Mohd Mustafa Al Bakri Abdullah, Mohd Shuhidan Saleh, and Lin Li. "Laser Cutting of Coronary Stents: Progress and Development in Laser Based Stent Cutting Technology." Key Engineering Materials 660 (August 2015): 345–50. http://dx.doi.org/10.4028/www.scientific.net/kem.660.345.

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Laser cutting is one of the key fabrication technologies applied to coronary stent manufacture. This paper reviews the recent progress in laser-based stent manufacturing, including different type of lasers used, laser interaction with different stent materials, process characteristics and quality/productivity issues.

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13

KIDERA, Masaaki. "Laser Additive Manufacturing Technologies." JOURNAL OF THE JAPAN WELDING SOCIETY 89, no. 1 (2020): 82–86. http://dx.doi.org/10.2207/jjws.89.82.

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14

Steen, W. M. "Laser processing in manufacturing." Optics & Laser Technology 26, no. 2 (April 1994): 140–41. http://dx.doi.org/10.1016/0030-3992(94)90100-7.

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15

Steen, W. M. "Laser processing in manufacturing." Materials & Design 14, no. 5 (January 1993): 313. http://dx.doi.org/10.1016/0261-3069(93)90148-o.

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16

Piqué, Alberto, Raymond C. Y. Auyeung, Heungsoo Kim, Nicholas A. Charipar, and Scott A. Mathews. "Laser 3D micro-manufacturing." Journal of Physics D: Applied Physics 49, no. 22 (May 5, 2016): 223001. http://dx.doi.org/10.1088/0022-3727/49/22/223001.

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17

Davies, W. S. "Laser processing in manufacturing." Optics and Lasers in Engineering 18, no. 5 (January 1993): 380. http://dx.doi.org/10.1016/0143-8166(93)90048-p.

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18

Rosa, Benoit, Pascal Mognol, and Jean-yves Hascoët. "Laser polishing of additive laser manufacturing surfaces." Journal of Laser Applications 27, S2 (February 2015): S29102. http://dx.doi.org/10.2351/1.4906385.

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19

Smurov, Igor. "Laser cladding and laser assisted direct manufacturing." Surface and Coatings Technology 202, no. 18 (June 2008): 4496–502. http://dx.doi.org/10.1016/j.surfcoat.2008.04.033.

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20

Kutsuna, Muneharu. "4^th Wave of Modernization by Photon/Electron Technology and Development of Advanced Laser Integrated Manufacturing System (ALIMS)." Materials Science Forum 580-582 (June 2008): 551–56. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.551.

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High power lasers, including CO2 laser, Nd:YAG laser, Excimer laser, Diode laser, LD pumped YAG laser, LD pumped Disk laser, LD pumped Fiber laser and Femto second laser, are now used as a modern tool for industries as well as a computer alike in the 4th wave of modernization. Lasers are currently used for welding, cutting, drilling, cladding, direct fabrication, marking, cleaning, micro-machining peening and forming of materials in modernized factories. The joining speed (= product of welding speed and penetration depth) of 45,000mm2/min for steel sheet can be obtained by a 10kW Yb: fiber laser and is that of 50kW electron beam welding, which require the vacuum chamber. As a result of large numbers of research and developments the Advanced Laser Integrated Manufacturing System (ALIMS) using high power diode lasers has been developed and used for modernization in many industrialized countries. The laser materials processing is now penetrated as a machining tool into many industries. In the present paper, an advanced laser integrated manufacturing systems and its applications to industries such as automotive, electronics, ship building and steel making industry are introduced. In addition, development of an advanced laser integrated manufacturing system using a 2kW fiber laser for welding a car panel and “Laser Roll Welding” system for dissimilar metal joints such as mild steel/high strength steel to aluminium alloys, titanium to aluminium and steel to titanium, is described for modernization of industries. It will be a magnificent for the industries. And the 4th wave of modernization and opto-mechatronics will be promoted more by laser/photon technology in the future.

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21

Banas, C. M. "Multikilowatt Lasers in Manufacturing." Journal of Engineering for Gas Turbines and Power 115, no. 1 (January 1, 1993): 172–76. http://dx.doi.org/10.1115/1.2906673.

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The fundamentals of laser beam interactions with materials are discussed briefly and unique laser processing capabilities are noted. Introduction of this processing capability to manufacturing is reviewed. Typical high-volume production application requirements are identified and representative performance and production experience are described. Specific multikilowatt laser welding, piercing, and hardfacing applications in aerospace production are described. The evolution of production processes is discussed against the background of required processing capability. Also discussed are the unique laser processing capabilities that resulted in selection of the laser for production. Production experience is reviewed and cost saving factors are noted.

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22

Bai, Shuang, and Jian Liu. "Femtosecond Laser Additive Manufacturing of Multi-Material Layered Structures." Applied Sciences 10, no. 3 (February 3, 2020): 979. http://dx.doi.org/10.3390/app10030979.

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Laser additive manufacturing (LAM) of a multi-material multi-layer structure was investigated using femtosecond fiber lasers. A thin layer of yttria-stabilized zirconia (YSZ) and a Ni–YSZ layer were additively manufactured to form the electrolyte and anode support of a solid oxide fuel cell (SOFC). A lanthanum strontium manganite (LSM) layer was then added to form a basic three layer cell. This single step process eliminates the need for binders and post treatment. Parameters including laser power, scan speed, scan pattern, and hatching space were systematically evaluated to obtain optimal density and porosity. This is the first report to build a complete and functional fuel cell by using the LAM approach.

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23

Huang, Jigang, Qin Qin, Jie Wang, and Hui Fang. "Two Dimensional Laser Galvanometer Scanning Technology for Additive Manufacturing." International Journal of Materials, Mechanics and Manufacturing 6, no. 5 (October 2018): 332–36. http://dx.doi.org/10.18178/ijmmm.2018.6.5.402.

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24

Kumar, Sanjay, and Sisa Pityana. "Laser-Based Additive Manufacturing of Metals." Advanced Materials Research 227 (April 2011): 92–95. http://dx.doi.org/10.4028/www.scientific.net/amr.227.92.

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For making metallic products through Additive Manufacturing (AM) processes, laser-based systems play very significant roles. Laser-based processes such as Selective Laser Melting (SLM) and Laser Engineered Net Shaping (LENS) are dominating processes while Laminated Object Manufacturing (LOM) has also been used. The paper will highlight key issues without going into details and try to present comparative pictures of the aforementioned processes. The issues included are machine, materials, applications, comparison, various possibilities and future works.

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25

Lu, Pan, Zhang Cheng-Lin, Liu Tong, Liu Xin-Yu, Liu Jiang-Lin, Liu Shun, Wang Wen-Hao, and Zhang Heng-Hua. "Molten pool structure and temperature flow behavior of green-laser powder bed fusion pure copper." Materials Research Express 9, no. 1 (January 1, 2022): 016504. http://dx.doi.org/10.1088/2053-1591/ac327a.

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Abstract Additive Manufacturing(AM) is an advanced direct-manufacturing technology, based on the discrete-stacking principle. Laser Powder Bed Fusion (L-PBF) is one of the most promising technologies in the field of metal AM, with the characteristics of fabricating parts with complex shapes directly. For L-PBF equipment , the core device is lasers, and almost all L-PBF printers are currently equipped with infrared laser. However, due to too low absorption rate of the pure copper surface to infrared laser and high thermal conductivity between pure copper, it is extremely challenging to fabricate pure copper by traditional infrared-laser powder bed fusion(IR L-PFB). In this work, green-laser was applied to replace traditional infrared laser during L-PBF process, molten pool structure and temperature flow behavior of Green-Laser powder bed additive manufacturing pure copper was studied by mesoscopic simulation. Here we show that green-laser greatly improved the absorption rate of the pure copper surface, and the result showed that with lower cost laser process parameters (lower laser power 300W and larger hatching space 0.08 mm), pure copper parts with smoother surface, no-remelting and no obvious defects could be fabricated successfully.

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26

KYOGOKU, Hideki. "Laser-based Additive Manufacturing Technology." Journal of The Surface Finishing Society of Japan 71, no. 11 (November 1, 2020): 677–83. http://dx.doi.org/10.4139/sfj.71.677.

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27

KATAYAMA, Seiji. "Laser Welding for Manufacturing Innovation." JOURNAL OF THE JAPAN WELDING SOCIETY 78, no. 8 (2009): 682–92. http://dx.doi.org/10.2207/jjws.78.682.

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28

Kovalenko, V. S. "Laser-aided manufacturing in Ukraine." Surface Engineering and Applied Electrochemistry 43, no. 3 (June 2007): 226–29. http://dx.doi.org/10.3103/s1068375507030167.

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29

Kelbassa, Ingomar, Terry Wohlers, and Tim Caffrey. "Quo vadis, laser additive manufacturing?" Journal of Laser Applications 24, no. 5 (November 2012): 050101. http://dx.doi.org/10.2351/1.4745081.

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30

Hwang, Myun Joong, and Jungho Cho. "Laser Additive Manufacturing Technology Review." Journal of Welding and Joining 32, no. 4 (August 31, 2014): 15–19. http://dx.doi.org/10.5781/jwj.2014.32.4.15.

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31

Besnea, Daniel, Alina Spanu, Victor Constantin, and Dontu Octavian. "Technological particularities of laser manufacturing." MATEC Web of Conferences 121 (2017): 03005. http://dx.doi.org/10.1051/matecconf/201712103005.

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32

Mingareev, Ilya, and Martin Richardson. "Laser Additive Manufacturing: Going Mainstream." Optics and Photonics News 28, no. 2 (February 1, 2017): 24. http://dx.doi.org/10.1364/opn.28.2.000024.

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33

Graf, Thomas. "The Laser Boosts Digital Manufacturing." PhotonicsViews 17, no. 3 (May 28, 2020): 1. http://dx.doi.org/10.1002/phvs.202070301.

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34

Heidrich, Sebastian, Annika Richmann, Patrick Schmitz, Edgar Willenborg, Konrad Wissenbach, Peter Loosen, and Reinhart Poprawe. "Optics manufacturing by laser radiation." Optics and Lasers in Engineering 59 (August 2014): 34–40. http://dx.doi.org/10.1016/j.optlaseng.2014.03.001.

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35

Graf, Thomas. "Laser Based Manufacturing Goes Ultrafast." Laser Technik Journal 11, no. 3 (June 2014): 1. http://dx.doi.org/10.1002/latj.201490027.

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36

Jakschik, Stefan, Stefan Meißner, and Steffen Blei. "Particle Filters for Laser Manufacturing." Laser Technik Journal 13, no. 1 (January 2016): 42–45. http://dx.doi.org/10.1002/latj.201600004.

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37

Hidai, Hirofumi, and Keiji Yamada. "Special Issue on Laser Machining." International Journal of Automation Technology 10, no. 6 (November 4, 2016): 853. http://dx.doi.org/10.20965/ijat.2016.p0853.

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Laser machining is widely applied in manufacturing processes thanks to the laser oscillator’s improved stability and to the emergence of new laser types. Laser machining has gone from microscale applications, such as semiconductor dicing to large-scale applications such as automobile-body welding, and laser power now ranges from several watts to several kilowatts. Machining tasks using lasers have expanded from conventional drilling, cutting, and welding to additive manufacturing, the internal machining of transparent materials, and surface texturing. Understanding these processes comprehensively requires that we study individual elements such as oscillators, focal optics, scanners and stages, and numerical control. This special issue features 13 research articles – one review and 12 papers – related to the most recent advances in laser machining. Their subjects cover the various machining processes of drilling, deposition, welding, photo curing, texturing, and annealing on the latest laser machines and in the newest applications. We deeply appreciate the careful work of all the authors and thank the reviewers for their incisive efforts. Without these contributions, this special issue could not have been created. We also hope that this special issue will trigger further research on laser machining advances.

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38

Gottmann, Jens, Dirk Wortmann, Ion Vasilief, Leonid Moiseev, and Dimitri Ganser. "Manufacturing of Nd:Gd3Ga5O12 ridge waveguide lasers by pulsed laser deposition and ultrafast laser micromachining." Applied Surface Science 254, no. 4 (December 2007): 1105–10. http://dx.doi.org/10.1016/j.apsusc.2007.09.070.

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39

Stepak, Bogusz, Arkadiusz J. Antonczak, and Krzysztof M. Abramski. "Optimization of femtosecond laser cutting of biodegradable polymer for medical devices manufacturing." Photonics Letters of Poland 8, no. 4 (December 31, 2016): 116. http://dx.doi.org/10.4302/plp.2016.4.09.

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This paper describes the experimental parameters involved in the femtosecond laser micromachining of biodegradable poly(L-lactide) which is frequently used in biomedical applications such as vascular stents or scaffolds. We investigated the influence of laser pulse energy, scanning strategy and number of overscans on the laser cutting throughput. The process parameters that enable reducing of a heat affected zone were determined. As a result, the optimal scanning strategy was determined in order to obtain high aspect ratio trenches in 380 ?m thick biodegradable polymer sheet. Full Text: PDF ReferencesW. Jia et al. "Effects of high-repetition-rate femtosecond laser micromachining on the physical and chemical properties of polylactide (PLA)", Opt. Express 23, 21 (2015). CrossRef F. Hendricks, R. Patel, and V.V. Matylistsky, "Micromachining of bio-absorbable stents with ultra-short pulse lasers", Proc. SPIE 9355, 935502 (2015). CrossRef W.Y. Yeong et al. "Annealing of Biodegradable Polymer Induced by Femtosecond Laser Micromachining", Adv. Eng. Mater. 4, 12 (2010). CrossRef K. Stolberg et al. "IR and green femtosecond laser machining of heat sensitive materials for medical devices at micrometer scale", Proc. SPIE 8968, 89680E (2014). CrossRef F. Hendricks et al. "High aspect ratio microstructuring of transparent dielectrics using femtosecond laser pulses: method for optimization of the machining throughput", Appl. Phys. A 117, 1 (2014). CrossRef A. Antonczak et al. "Degradation of poly(l-lactide) under CO2 laser treatment above the ablation threshold", Polym. Deg. Stab. 109, 97-105 (2014) CrossRef B. Stepak et al. "The influence of ArF excimer laser micromachining on physicochemical properties of bioresorbable poly(L-lactide)", Proc SPIE 9736, 97361T (2016). CrossRef

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40

Jiao, Lishi, Zhong Chua, Seung Moon, Jie Song, Guijun Bi, Hongyu Zheng, Byunghoon Lee, and Jamyeong Koo. "Laser-Induced Graphene on Additive Manufacturing Parts." Nanomaterials 9, no. 1 (January 11, 2019): 90. http://dx.doi.org/10.3390/nano9010090.

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Additive manufacturing (AM) has become more prominent in leading industries. Recently, there have been intense efforts to achieve a fully functional 3D structural electronic device by integrating conductive structures into AM parts. Here, we introduce a simple approach to creating a conductive layer on a polymer AM part by CO2 laser processing. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy were employed to analyze laser-induced modifications in surface morphology and surface chemistry. The results suggest that conductive porous graphene was obtained from the AM-produced carbon precursor after the CO2 laser scanning. At a laser power of 4.5 W, the lowest sheet resistance of 15.9 Ω/sq was obtained, indicating the excellent electrical conductivity of the laser-induced graphene (LIG). The conductive graphene on the AM parts could serve as an electrical interconnection and shows a potential for the manufacturing of electronics components. An interdigital electrode capacitor was written on the AM parts to demonstrate the capability of LIG. Cyclic voltammetry, galvanostatic charge-discharge, and cyclability testing demonstrated good electrochemical performance of the LIG capacitor. These findings may create opportunities for the integration of laser direct writing electronic and additive manufacturing.

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41

Grigoryants, Aleksandr. "Additive technologies for manufacturing composite products." Science intensive technologies in mechanical engineering, no. 8 (September 1, 2021): 18–24. http://dx.doi.org/10.30987/2223-4608-2021-8-18-24.

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42

Schaumberger, Kerstin, Michael Mödl, Vincent Mann, Stephan Roth, and Michael Schmidt. "Qualification of Direct Diode Lasers for Laser Beam Welding in Order to Enhance Process Efficiency." Applied Mechanics and Materials 882 (July 2018): 127–34. http://dx.doi.org/10.4028/www.scientific.net/amm.882.127.

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Laser beam welding has become an established joining technique in automotive manufacturing. Common solid-state lasers generate high-quality joints, but they provide low energy efficiency. By contrast, direct diode lasers (DDL) have superior energy efficiency, are cheaper to purchase and additionally require less utility space. To examine the overall performance of direct diode lasers in comparison to disk lasers, welding quality and energy consumption of the two lasers have to be evaluated. Additionally, for this contribution the stability of the DDL’s beam, like temporal variation of focus position and beam shape, is examined. It is found that a focus shift takes place for longer periods of emission, but the variation of the focus diameter in the initial focal plane is negligible. As expected, the direct diode laser consumes less energy than the disk laser for the same output power. Welding experiments are conducted using four different steel alloys that are exemplary for engineering materials used in automotive manufacturing. Metallographic analysis shows that weld seam depths and widths are on average larger using the disk laser. However even with the need for higher output powers to achieve equal seam geometries the DDL consumes less energy and thereby causes less costs.

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Meszlényi, György, János Dobránszky, and Zsolt Puskás. "Laser Cutting of High Precision Tubes." Materials Science Forum 589 (June 2008): 427–31. http://dx.doi.org/10.4028/www.scientific.net/msf.589.427.

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This paper gives an overview of the laser cutting equipment developed for stent cutting: Nd:YAG, fiber and water-jet guided lasers; work piece positioning systems and different materials for stent manufacturing were presented. The side effects of laser cutting like oxide layer, heat affected zone and dross deposition were examined. Pulsed Nd:YAG laser cutting of AISI 304L type austenitic stainless steel high precision tube with 1,800 mm diameter and 0,117 mm wall thickness was performed. The relationship between the average power and kerf was characterised.

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Balasubramanian, S., K. Manonmani, and R. M. Hemalatha. "Lasers in Green Manufacturing Processes." Applied Mechanics and Materials 592-594 (July 2014): 473–78. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.473.

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A safe and healthy work piece is important for sustainable manufacturing process. Green laser surface hardening is a heat treatment process on a part of its application does not use water or oil as quenching media, because it is self-quenching and less detrimental to the environment. Since it is an energy saving process it is fast being adopted by manufacturing industries. Quenching media used in conventional heat treatment process for a sudden cooling of the heated work piece to get hard structure transformation. Unfortunately the reactions of quenchant with hot working also have several negative health, production cost, and environmental impact.This paper focuses the experimental investigation into the roller of green surface hardening on energy saving, the production cost of the industrial components. A comparative study of surface hardening under conventional and laser sources was conducted using similar components. The results show that the quality of hardening improved in laser hardening but the process time increased marginally at one stage and reduced at other shapes of manufacturing. In analyzing the process cost laser hardening show cast saving notably.

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Jin, Yong Ping, and Ming Hu. "Direct Rapid Manufacturing Technology with Laser for Metal Parts." Advanced Materials Research 328-330 (September 2011): 520–23. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.520.

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Directly driven by CAD model, based on principle of discrete-superposition, rapid prototyping technology is the generic terms of rapid manufacturing 3-dimensional physical entities with any complex shape. One of its main development trends is direct rapid manufacturing for metal parts. Up to now, there are many methods utilizing laser beam containing selective laser melting, selective laser sintering and laser engineered net shaping. Research and development of these means for direct rapid metal manufacturing are presented in this paper. Digital direct rapid manufacturing for metal parts represents development direction of advanced manufacturing technology.

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Sahasrabudhe, Himanshu, and Amit Bandyopadhyay. "Laser-Based Additive Manufacturing of Zirconium." Applied Sciences 8, no. 3 (March 7, 2018): 393. http://dx.doi.org/10.3390/app8030393.

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Zhong Minlin, 钟敏霖, and 范培迅 Fan Peixun. "Applications of Laser Nano Manufacturing Technologies." Chinese Journal of Lasers 38, no. 6 (2011): 0601001. http://dx.doi.org/10.3788/cjl201138.0601001.

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Sima, Felix, and Koji Sugioka. "Ultrafast laser manufacturing of nanofluidic systems." Nanophotonics 10, no. 9 (June 11, 2021): 2389–406. http://dx.doi.org/10.1515/nanoph-2021-0159.

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Abstract In the last decades, research and development of microfluidics have made extraordinary progress, since they have revolutionized the biological and chemical fields as a backbone of lab-on-a-chip systems. Further advancement pushes to miniaturize the architectures to nanoscale in terms of both the sizes and the fluid dynamics for some specific applications including investigation of biological sub-cellular aspects and chemical analysis with much improved detection limits. In particular, nano-scale channels offer new opportunities for tests at single cell or even molecular levels. Thus, nanofluidics, which is a microfluidic system involving channels with nanometer dimensions typically smaller than several hundred nm, has been proposed as an ideal platform for investigating fundamental molecular events at the cell-extracellular milieu interface, biological sensing, and more recently for studying cancer cell migration in a space much narrower than the cell size. In addition, nanofluidics can be used for sample manipulation in analytical chemistry, such as sample injections, separation, purifications or for quantitative and qualitative determinations. Among the nanofabrication technologies, ultrafast laser manufacturing is a promising tool for fabrication of nanofluidics due to its flexibility, versatility, high fabrication resolution and three dimensional (3D) fabrication capability. In this paper, we review the technological advancements of nanofluidic systems, with emphasis on fabrication methods, in particular ultrafast laser manufacturing. We present the challenges for issues concerning channel sizes and fluid dynamics, and introduce the applications in physics, biology, chemistry and engineering with future prospects.

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NIINO, Hiroyuki. "Green Photonics for laser-based manufacturing." Synthesiology 8, no. 3 (2015): 145–57. http://dx.doi.org/10.5571/synth.8.3_145.

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NIINO, Hiroyuki. "Green photonics for laser-based manufacturing." Synthesiology English edition 8, no. 3 (2015): 133–46. http://dx.doi.org/10.5571/syntheng.8.3_133.

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