Journal articles: 'Laser micro'

1

Wilson, J. I. B. "Laser Micro Analysis." Journal of Modern Optics 37, no. 7 (July 1990): 1278. http://dx.doi.org/10.1080/09500349014551371.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Gillner, Arnold. "Laser Micro Processing." Laser Technik Journal 5, no. 1 (January 2008): 27–30. http://dx.doi.org/10.1002/latj.200790202.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

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

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Baoquan Yao, Baoquan Yao, He Li He Li, Shuang Bai Shuang Bai, Zheng Cui Zheng Cui, Xiaolei Li Xiaolei Li, Xiaoming Duan Xiaoming Duan, Yingjie Shen Yingjie Shen, and and Tongyu Dai and Tongyu Dai. "Performance of a monolithic Tm:YLF micro laser." Chinese Optics Letters 14, no. 6 (2016): 061401–61404. http://dx.doi.org/10.3788/col201614.061401.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Xu, Jingjing, Ming Zeng, Xin Xu, Junhui Liu, Xinyu Huo, Danhong Han, Zhenhai Wang, and Lan Tian. "A Micron-Sized Laser Photothermal Effect Evaluation System and Method." Sensors 21, no. 15 (July 29, 2021): 5133. http://dx.doi.org/10.3390/s21155133.

Full text

Abstract:

The photothermal effects of lasers have played an important role in both medical laser applications and the development of cochlear implants with optical stimulation. However, there are few methods to evaluate the thermal effect of micron-sized laser spots interacting with other tissues. Here, we present a multi-wavelength micro-scale laser thermal effect measuring system that has high temporal, spatial and temperature resolutions, and can quantitatively realize evaluations in real time. In this system, with accurate 3D positioning and flexible pulsed laser parameter adjustments, groups of temperature changes are systematically measured when the micron-sized laser spots from six kinds of wavelengths individually irradiate the Pd/Cr thermocouple junction area, and reference data of laser spot thermal effects are obtained. This work develops a stable, reliable and universal tool for quantitatively exploring the thermal effect of micron-sized lasers, and provides basic reference data for research on light-stimulated neuron excitement in the future.

APA, Harvard, Vancouver, ISO, and other styles

6

Wang, Bang Fu, Xue Li Zhu, Ou Xie, and Zhen Yin. "Based on Microscale Laser Shock Processing of Metal Material Characteristics Analysis and Prospect." Advanced Materials Research 450-451 (January 2012): 273–76. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.273.

Full text

Abstract:

It is introduced that laser shock peening is suitable for machining metal micro components. The micro scale effect and elastic-plastic theory of micro scale laser shock processing were analyzed and discussed. The research status, mechanism, key technology and influence factors of microscale lager shock peening were summarized and the problems in microscale lager shock peening were analyzed, which provides guidance for further research.

APA, Harvard, Vancouver, ISO, and other styles

7

Jang, Mu-Yeon, Chan-Jung Kim, Jeong-Woo Park, Seung-Yub Baek, and Tae-Wan Kim. "Fabrication of Superhydrophobic Surface with Curved Grooves Using High Power Diode Laser." Journal of Nanoscience and Nanotechnology 21, no. 9 (September 1, 2021): 4968–73. http://dx.doi.org/10.1166/jnn.2021.19265.

Full text

Abstract:

Most studies on hydrophobic surfaces processed by lasers rely on the use of pico- or femtosecond lasers. However, in industrial application, the fabrication methods using pico- or femtosecond lasers have the disadvantages of high cost and low efficiency In this study, we tried to fabricate hydrophobic surfaces using a high-power general-purpose diode laser. We have fabricated various micro/nano hierarchical structures for aluminum (Al5052) surface using laser groove processing technology. The surface of laser ablated micro structure is decorated with nano roughness, resulting in micro/nano hierarchical structure. Specimen with curved grooves are fabricated, and the correlation of wettability characteristics with spaces, widths, and curvature radii of grooves are presented. It was found that the higher contact angle was formed with a decrease of the curvature radius. We have also fabricated specimens with various micro-wavy surface pattern. The water droplets on the micro-wavy pattern kept the spherical shape with a high contact angle of 165 degrees or more.

APA, Harvard, Vancouver, ISO, and other styles

8

Sirleto, Luigi. "Micro and Nano Raman Lasers." Micromachines 12, no. 1 (December 25, 2020): 15. http://dx.doi.org/10.3390/mi12010015.

Full text

Abstract:

Raman lasers (RLs) are a class of optically pumped laser, offering coherent lights at any desired wavelength by a proper choice of the pump wavelength, when both wavelengths are within the transparency region of the gain material and an adequately high nonlinearity and/or optical intensity are provided [...]

APA, Harvard, Vancouver, ISO, and other styles

9

Kim, Joo-Han, and Chul-Ku Lee. "Laser Micro Bonding Technology." Journal of the Korean Welding and Joining Society 25, no. 2 (April 30, 2007): 1–2. http://dx.doi.org/10.5781/kwjs.2007.25.2.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

NAKAGAWA, Ryo, Keiich AOKI, Tomomasa OOKUBO, Takashi YABE, and Youichi OGATA. "Laser-Driven Micro-Airplane." Proceedings of The Computational Mechanics Conference 2002.15 (2002): 421–22. http://dx.doi.org/10.1299/jsmecmd.2002.15.421.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Kovalenko, Volodymyr S. "Laser micro- and nanoprocessing." International Journal of Nanomanufacturing 1, no. 2 (2006): 173. http://dx.doi.org/10.1504/ijnm.2006.012190.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Phipps, C. R., J. R. Luke, G. G. McDuff, and T. Lippert. "Laser-driven micro-rocket." Applied Physics A 77, no. 2 (July 2003): 193–201. http://dx.doi.org/10.1007/s00339-003-2144-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

TAKAHASHI, Kenji, Takehiro WATANABE, Souta MATSUSAKA, and Tsutomu WADA. "Direct Micro-joining of Copper Materials with YAG Laser Beams(Laser processing (continued))." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2005.2 (2005): 799–804. http://dx.doi.org/10.1299/jsmelem.2005.2.799.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Rizwan Ul, Haque Syed, Wei Jiang, Ji Xu Wen, and A. H. Mussie. "Advancement of Laser Micro-Welding." Advanced Materials Research 628 (December 2012): 183–86. http://dx.doi.org/10.4028/www.scientific.net/amr.628.183.

Full text

Abstract:

Recently, laser welding has been in its infancy primarily used for exotic applications where no other welding process would be suitable. In recent era, industrial product parts and components are produced at a minute-scale for sustainable manufacturing, creating a growing need for micro-welding applications. In this regards, laser processing is more likely considered to be the method of choice as it allows precise heat control compared with other parallel methods. This paper presents the operating principle of laser device. In line with this it puts forth a review on advancement of Laser welding/Laser Micro-Welding. At the end, it concludes with description of benefits manufacturing engineers would obtain.

APA, Harvard, Vancouver, ISO, and other styles

16

Wang, Ming Di, Shi Hong Shi, Hong Yu Wang, Cheng Feng Sun, and X. B. Liu. "Experimental Study on Single-Layer Laser Cladding Feeding by Micro/Nano Composite Powders." Key Engineering Materials 562-565 (July 2013): 958–63. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.958.

Full text

Abstract:

Aimed at the lack of the cladding materials such as micro or nanopowder, the micro/nanocomposite powders prepared for experiment are feed directly, the key process parameters on the quality of the surface quality and microstructure analysis of the single-layer of laser cladding are studied in detail. Compared to the ordinary laser micro-cladding layer feeding by the micro powder, the cladding layer is more refined, which has more good mechanical properties. The results showed that: using reasonable parameters, the microstructure and macro-morphology of cladding layer with micro-nanocomposite powders feed directly are better than of micron powders.

APA, Harvard, Vancouver, ISO, and other styles

17

Klug, Ulrich, and Frank Siegel. "Laser Micro Processing using short Laser Pulses." Laser Technik Journal 4, no. 1 (January 2007): 32–35. http://dx.doi.org/10.1002/latj.200790140.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Lu, Xi Zhao, Chun Lin, Zhen Heng Lin, and Yuan Qing Huang. "Laser Beam Shapers Applied in the Laser Micro-Jet Processing." Applied Mechanics and Materials 29-32 (August 2010): 1925–29. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1925.

Full text

Abstract:

With respect to the methods of precise processing, the laser micro-jet system became a hot topic in recent years. In this paper, inverted Galileo telescope would reform the laser beam of Gaussian distribution into a flat-topped distribution spot, micro-jet is adopted in order to achieve a processing sharp cutter which owned the characterize of more sharp to process. It should be a reformed laser water micro-jet processing. The experiment of laser micro-jet was carried out to make reliable proof. The design of optical path integrated the Galileo shaper would reduce the pulse width under the safe circumstance. The quality of working laser beam was improved with compressing the width of flat-topped of laser beam. Laser micro-jet processing is an international patent technique which was developed by Dr. Bernold Richerzhagen in 1998[1]. During the laser processing, laser micro-jet could be used as light guide, which dues to the total internal reflection at the water-air interface [2.]

APA, Harvard, Vancouver, ISO, and other styles

19

Sugioka, Koji. "Progress in ultrafast laser processing and future prospects." Nanophotonics 6, no. 2 (March 1, 2017): 393–413. http://dx.doi.org/10.1515/nanoph-2016-0004.

Full text

Abstract:

AbstractThe unique characteristics of ultrafast lasers have rapidly revolutionized materials processing after their first demonstration in 1987. The ultrashort pulse width of the laser suppresses heat diffusion to the surroundings of the processed region, which minimizes the formation of a heat-affected zone and thereby enables ultrahigh precision micro- and nanofabrication of various materials. In addition, the extremely high peak intensity can induce nonlinear multiphoton absorption, which extends the diversity of materials that can be processed to transparent materials such as glass. Nonlinear multiphoton absorption enables three-dimensional (3D) micro- and nanofabrication by irradiation with tightly focused femtosecond laser pulses inside transparent materials. Thus, ultrafast lasers are currently widely used for both fundamental research and practical applications. This review presents progress in ultrafast laser processing, including micromachining, surface micro- and nanostructuring, nanoablation, and 3D and volume processing. Advanced technologies that promise to enhance the performance of ultrafast laser processing, such as hybrid additive and subtractive processing, and shaped beam processing are discussed. Commercial and industrial applications of ultrafast laser processing are also introduced. Finally, future prospects of the technology are given with a summary.

APA, Harvard, Vancouver, ISO, and other styles

20

Morillon, P., J. Cl Farcy, F. Gilbert, G. Hélias, and G. Legeay. "Micro-usinage par laser pour interconnexions micro-électroniques." Annales de Physique 22 (February 1997): C1–237—C1–244. http://dx.doi.org/10.1051/anphys/1997046.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

BOHME, Rico, Klaus ZIMMER, and Bernd RAUSCHENBACH. "Fabrication of micro-optical elements in fused silica with laser backside etching(Laser processing)." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2005.1 (2005): 291–95. http://dx.doi.org/10.1299/jsmelem.2005.1.291.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Li, Qingfeng, David Grojo, Anne-Patricia Alloncle, Boris Chichkov, and Philippe Delaporte. "Digital laser micro- and nanoprinting." Nanophotonics 8, no. 1 (October 16, 2018): 27–44. http://dx.doi.org/10.1515/nanoph-2018-0103.

Full text

Abstract:

AbstractLaser direct writing is a well-established ablation technology for high-resolution patterning of surfaces, and since the development of additive manufacturing, laser processes have also appeared very attractive for the digital fabrication of three-dimensional (3D) objects at the macro-scale, from few millimeters to meters. On the other hand, laser-induced forward transfer (LIFT) has demonstrated its ability to print a wide range of materials and to build functional micro-devices. For many years, the minimum size of laser-printed pixels was few tens of micrometers and is usually organized in two dimensions. Recently, new approaches have been investigated, and the potential of LIFT technology for printing 2D and 3D sub-micrometer structures has become real. After a brief description of the LIFT process, this review presents the pros and cons of the different digital laser printing technologies in the aim of the additive nanomanufacturing application. The transfer of micro- and nano-dots in the liquid phase from a solid donor film appears to be the most promising approach to reach the goal of 3D nanofabrication, and the latest achievements obtained with this method are presented and discussed.

APA, Harvard, Vancouver, ISO, and other styles

23

Zhang, Chen, Dongbin Zhang, Can Luo, Weiping Peng, and Xusheng Zang. "Nanosecond-Pulse Laser Assisted Cold Spraying of Al–Cu Aluminum Alloy." Coatings 11, no. 3 (February 25, 2021): 267. http://dx.doi.org/10.3390/coatings11030267.

Full text

Abstract:

In this study, nanosecond-pulse laser is used in combination with cold spraying to form a hybrid solid-state forming technology: nanosecond-pulse laser assisted cold spraying. This method successfully manufactured Al-Cu high-strength aluminum alloy coatings. The nanosecond-pulse laser reduced the porosity of the coatings. The laser-induced micro-texture on the substrate surface had the ability of improving the bonding strength of the coating-substrate interface. The bonding strength was closely related to the depth of the micro-texture. The deeper micro-texture caused an unfused interface on the bottom of the texture, which produced voids and reduced the bonding strength. The nanosecond-pulse lasers can also increase the hardness of the coatings. The assistance of the nanosecond-pulse laser has proved to be an effective method to improve the quality of cold sprayed metal coatings.

APA, Harvard, Vancouver, ISO, and other styles

24

Zacharatos, Filimon, Ioannis Theodorakos, Panagiotis Karvounis, Simon Tuohy, Nuno Braz, Semyon Melamed, Ayala Kabla, et al. "Selective Laser Sintering of Laser Printed Ag Nanoparticle Micropatterns at High Repetition Rates." Materials 11, no. 11 (October 31, 2018): 2142. http://dx.doi.org/10.3390/ma11112142.

Full text

Abstract:

The increasing development of flexible and printed electronics has fueled substantial advancements in selective laser sintering, which has been attracting interest over the past decade. Laser sintering of metal nanoparticle dispersions in particular (from low viscous inks to high viscous pastes) offers significant advantages with respect to more conventional thermal sintering or curing techniques. Apart from the obvious lateral selectivity, the use of short-pulsed and high repetition rate lasers minimizes the heat affected zone and offers unparalleled control over a digital process, enabling the processing of stacked and pre-structured layers on very sensitive polymeric substrates. In this work, the authors have conducted a systematic investigation of the laser sintering of micro-patterns comprising Ag nanoparticle high viscous inks: The effect of laser pulse width within the range of 20–200 nanoseconds (ns), a regime which many commercially available, high repetition rate lasers operate in, has been thoroughly investigated experimentally in order to define the optimal processing parameters for the fabrication of highly conductive Ag patterns on polymeric substrates. The in-depth temperature profiles resulting from the effect of laser pulses of varying pulse widths have been calculated using a numerical model relying on the finite element method, which has been fed with physical parameters extracted from optical and structural characterization. Electrical characterization of the resulting sintered micro-patterns has been benchmarked against the calculated temperature profiles, so that the resistivity can be associated with the maximal temperature value. This quantitative correlation offers the possibility to predict the optimal process window in future laser sintering experiments. The reported computational and experimental findings will foster the wider adoption of laser micro-sintering technology for laboratory and industrial use.

APA, Harvard, Vancouver, ISO, and other styles

25

Coroado, Julio, Supriyo Ganguly, Wojciech Suder, Stewart Williams, Sonia Meco, and Goncalo Pardal. "Selection of parameters in nanosecond pulsed wave laser micro-welding." International Journal of Advanced Manufacturing Technology 115, no. 9-10 (May 31, 2021): 2929–44. http://dx.doi.org/10.1007/s00170-021-07251-8.

Full text

Abstract:

AbstractThe digital control of the latest nanosecond pulsed wave (PW) fibre lasers allows very high flexibility in controlling the application of the total energy to a workpiece, which brings several advantages to the joining process. By choosing different pulse shapes in different spatial profiles, it is possible to apply low energy per pulse with high precision and accuracy resulting in lower heat input. Since the energy of each pulse is insufficient to generate melting, these lasers operate at very high pulse repetition frequencies near continuous wave (CW) regime. Nevertheless, the peak powers of PW lasers are much higher than CW. In this research, the effect of peak power, pulse energy, pulse width, pulse repetition frequency and duty cycle has been studied. The experimental work was conducted in bead on plate of austenitic stainless steel to investigate the effect of laser on the weld geometry, i.e. depth of penetration and width. An empirical model, previously established for CW mode, which enables the achievement of a particular penetration depth independent of the beam diameter, was redesigned and tested for PW mode. The “pulse power factor model” allows the laser user to select a weld profile that meets certain quality and productivity requirements independent of the laser system. It was shown that identical depth of penetration but different weld metal profile can be obtained for a specific beam diameter for a range of different system parameters by keeping a constant trade-off between pulse power factor and interaction time.

APA, Harvard, Vancouver, ISO, and other styles

26

Schille, Joerg. "Highspeed Laser Micro Processing using Ultrashort Laser Pulses." Journal of Laser Micro/Nanoengineering 9, no. 2 (June 2014): 161–68. http://dx.doi.org/10.2961/jlmn.2014.02.0015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Lu Xizhao, 卢希钊, 江开勇 Jiang Kaiyong, 姜峰 Jiang Feng, and 雷廷平 Lei Tingping. "Laser Micro-jet Enhanced Processing Laser Energy Distribution." Applied laser 35, no. 2 (2015): 230–35. http://dx.doi.org/10.3788/al20153502.0230.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Schulze Niehoff, H., Zhen Yu Hu, and Frank Vollertsen. "Mechanical and Laser Micro Deep Drawing." Key Engineering Materials 344 (July 2007): 799–806. http://dx.doi.org/10.4028/www.scientific.net/kem.344.799.

Full text

Abstract:

Mechanical micro deep drawing becomes a more and more industrial relevant process. But due to size effects new challenges are involved in this process compared to macro deep drawing. The size effects cause an increase of friction and thus hinder the material flow. The change of friction in mechanical micro deep drawing is subject of the presented investigations in this paper. Additionally to this, a new non-mechanical micro deep drawing process is presented, whereby a laser beam acts as a punch. This new laser deep drawing process is based on a totally different mechanism compared to thermal laser forming, e.g. forming by laser induced thermal stresses: The laser produces a pulse with an extremely high power density, which causes plasma generation at the target and thus a shock wave. The shock wave can be used as in explosive forming, but is smaller and easier to generate. Recent investigations showed that using this technology laser deep drawing is possible with a sheet metal out of Al 99.5 and a thickness of 50 'm. The deep drawing process was carried out with a die diameter of 4 mm and shows promising results.

APA, Harvard, Vancouver, ISO, and other styles

29

Zhu, Gangyi, Siqing He, Jiaping Li, Jialei Yuan, Feifei Qin, Jitao Li, Xin Li, and Yongjin Wang. "GaN micro-chimney cavity laser." Optics Communications 474 (November 2020): 126054. http://dx.doi.org/10.1016/j.optcom.2020.126054.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

任, 航. "Design of Laser Micro-Projector." Instrumentation and Equipments 03, no. 04 (2015): 121–28. http://dx.doi.org/10.12677/iae.2015.34018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Tan *, B., and K. Venkatakrishnan. "Dual-focus laser micro-machining." Journal of Modern Optics 52, no. 17 (November 20, 2005): 2603–11. http://dx.doi.org/10.1080/09500340500227745.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Regenfuss, P., A. Streek, L. Hartwig, S. Klötzer, Th Brabant, M. Horn, R. Ebert, and H. Exner. "Principles of laser micro sintering." Rapid Prototyping Journal 13, no. 4 (August 7, 2007): 204–12. http://dx.doi.org/10.1108/13552540710776151.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Shen, Hong. "Mechanism of laser micro-adjustment." Journal of Physics D: Applied Physics 41, no. 24 (November 27, 2008): 245106. http://dx.doi.org/10.1088/0022-3727/41/24/245106.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Konov, V. I. "Laser-plasma micro- and nanotechnologies." Herald of the Russian Academy of Sciences 81, no. 3 (June 2011): 252–60. http://dx.doi.org/10.1134/s1019331611030142.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

KUBOTA, Keiichi. "Micro-Processing by Diode-Laser Pumped Solid-State Lasers." Review of Laser Engineering 28, no. 1 (2000): 3–8. http://dx.doi.org/10.2184/lsj.28.3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Schmitt, Felix. "Laser Beam Micro Welding With High Brilliant Fiber Lasers." Journal of Laser Micro/Nanoengineering 5, no. 3 (December 2010): 197–203. http://dx.doi.org/10.2961/jlmn.2010.03.0003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Jackson, M. J., and W. O’Neill. "Laser micro-drilling of tool steel using Nd:YAG lasers." Journal of Materials Processing Technology 142, no. 2 (November 2003): 517–25. http://dx.doi.org/10.1016/s0924-0136(03)00651-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Liu, Hui Xia, Yi Xing Chen, Xiao Wang, Xiao Xia Meng, Yong Hong Fu, and Lan Cai. "Numerical Simulation of Laser Surface Micro-Texturing." Materials Science Forum 575-578 (April 2008): 678–83. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.678.

Full text

Abstract:

In order to predict the geometry character of laser surface micro-texturing, the finite element analyzing software ANSYS is used to simulate temperature field and crater on the laser ablation. The influence and change regulation of laser intensity, laser pulse number and pulse duration in laser surface texturing are analyzed in detail. The simulation results conclude the best laser intensity in laser-pulse and materials interactions on certain conditions, and the best pulse duration in nanosecond laser micromachining. This research establishes the foundation for laser machining regular non-smooth surface in a rapid and effective way.

APA, Harvard, Vancouver, ISO, and other styles

39

Eliezer, Shalom. "Relativistic acceleration of micro-foils with prospects for fast ignition." Laser and Particle Beams 30, no. 2 (March 12, 2012): 225–31. http://dx.doi.org/10.1017/s0263034611000863.

Full text

Abstract:

AbstractIn this work, it is suggested that the ponderomotive force, induced by a multi-petawatt laser on the interface of a vacuum with solid target, can accelerate a micro-foil to relativistic velocities. The extremely high velocities of the micro-foil can be achieved due to the very short time duration (about a picosecond) of the laser pulse. This accelerated micro-foil is used to ignite a pre-compressed cylindrical shell containing the deuterium tritium fuel. The fast ignition is induced by a heat wave produced during the collision of the accelerated foil with the pre-compressed target. This approach has the advantage of separating geometrically the nanoseconds lasers that compress the target with the picosecond laser that accelerates the foil.

APA, Harvard, Vancouver, ISO, and other styles

40

Wingham, James Robert, Robert Turner, Joanna Shepherd, and Candice Majewski. "Micro-CT for analysis of laser sintered micro-composites." Rapid Prototyping Journal 26, no. 4 (January 2, 2020): 649–57. http://dx.doi.org/10.1108/rpj-08-2019-0211.

Full text

Abstract:

Purpose X-Ray-computed micro-tomography (micro-CT) is relatively well established in additive manufacturing as a method to determine the porosity and geometry of printed parts and, in some cases, the presence of inclusions or contamination. This paper aims to demonstrate that micro-CT can also be used to quantitatively analyse the homogeneity of micro-composite parts, in this case created using laser sintering (LS). Design/methodology/approach LS specimens were manufactured in polyamide 12 with and without incorporation of a silver phosphate glass additive in different sizes. The specimens were scanned using micro-CT to characterise both their porosity and the homogeneity of dispersion of the additive throughout the volume. Findings This work showed that it was possible to use micro-CT to determine information related to both porosity and additive dispersion from the same scan. Analysis of the pores revealed the overall porosity of the printed parts, with linear elastic fracture mechanics used to identify any pores likely to lead to premature failure of the parts. Analysis of the additive was found to be possible above a certain size of particle, with the size distribution used to identify any agglomeration of the silver phosphate glass. The particle positions were also used to determine the complete spatial randomness of the additive as a quantitative measure of the dispersion. Practical implications This shows that micro-CT is an effective method of identifying both porosity and additive agglomeration within printed parts, meaning it can be used for quality control of micro-composites and to validate the homogeneity of the polymer/additive mixture prior to printing. Originality/value This is believed to be the first instance of micro-CT being used to identify and analyse the distribution of an additive within a laser sintered part.

APA, Harvard, Vancouver, ISO, and other styles

41

Tomczyk, Mariusz, Maria Walczak, and Piotr Sęk. "Laser Technologies in Microsystems." Advanced Materials Research 874 (January 2014): 119–24. http://dx.doi.org/10.4028/www.scientific.net/amr.874.119.

Full text

Abstract:

This article presents some results of laser processing of materials, used for the construction of microsystems and micro-sensors, e.g. Si, Al2O3 and zirconia ceramics. The necessity of faithful reproducing the geometry and dimensions in the micro-scale puts specific requirements for laser machining process. Laser micro-technologies must be conducted under conditions which ensure the perfect guidance of a well-focused laser beam, scanning at a suitable speed, and the laser pulse duration with proper repetition frequency. The amount of absorbed energy depends on wavelength of laser radiation and kind of material, which also influence on this process. All these conditions should take into account the need to maintain a small heat affected zone (HAZ). This guarantees keeping the true reproduction of micro-shapes and cutting edges with a different angle of lines even in micro-scale details. The present work confirms the possibility of using laser technology for such applications.

APA, Harvard, Vancouver, ISO, and other styles

42

Song, Hanyu, Zheng Kang, Ze Liu, and Benxin Wu. "Experimental study of double-pulse laser micro sintering: A novel laser micro sintering process." Manufacturing Letters 19 (January 2019): 10–14. http://dx.doi.org/10.1016/j.mfglet.2018.12.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Huang, Chao, Ji Min Chen, and Jian Wen Yuan. "The Study of Glass Cutting Based on the Micro-Crack Control." Key Engineering Materials 562-565 (July 2013): 1408–13. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.1408.

Full text

Abstract:

A 532nm Diode-Pumped green laser was used to cut glass with the Micro-Crack control. The Micro-Crack was the micron-sized round-like crack caused by laser in the glass and the line-crack around the round-like crack. This paper researched the generation of the Micro-Crack and discussed how to control it, then researched the stress field in the glass during the cutting by finite element analysis. Propose a new method about the glass cutting which had advantages of low power, low heat effect, irregular-curve cutting and slant cutting.

APA, Harvard, Vancouver, ISO, and other styles

44

Lu, Xi Zhao. "Laser Micro-Jet Processing on Red Copper." Advanced Materials Research 602-604 (December 2012): 2040–44. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.2040.

Full text

Abstract:

Red copper is difficult to process with laser for its high reflection rate and high density. On the contrary, with the development of Modern Laser Micro-Jet processing, the new Laser Micro-jet with 30μm and 130μm are utilized to process new area like red copper plate etc., new Laser Micro-jet with 30μm nozzle is redesigned as well as working experiment on red copper is carried out. Red copper is machining with the Laser Micro-Jet The experiment shows the methods can improve the red copper‘s machining quality, on the contrary, the result of experiment shows the new laser processing methods can machine red copper efficiently.

APA, Harvard, Vancouver, ISO, and other styles

45

Bi, Gui Jun, Sum Huan Ng, Khin Thet May, and Cong Zhi Chan. "Micro-Laser Welding of Plastics for the Applications in Micro-Fluidic Devices." Key Engineering Materials 447-448 (September 2010): 745–49. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.745.

Full text

Abstract:

This study aims to investigate laser welding process for the bonding of micro-fluidic devices. PMMA was selected for the investigation. The devices consist of an opaque substrate with micro-channels and a transparent cover. The welding process was optimized according to laser power, welding speed and clamping pressure. The cross-sectional analysis, flow and pressure tests, as well as the lap-shear test were conducted on the samples welded with the optimized process parameters. The results show that the laser welding can meet the requirements for bonding the plastic micro-fluidic devices.

APA, Harvard, Vancouver, ISO, and other styles

46

Eliezer, Shalom, Noaz Nissim, José Maria Martínez Val, Kunioki Mima, and Heinrich Hora. "Double layer acceleration by laser radiation." Laser and Particle Beams 32, no. 2 (February 14, 2014): 211–16. http://dx.doi.org/10.1017/s0263034613001018.

Full text

Abstract:

AbstractIt is shown that it is possible to accelerate micro-foils to velocities from 108 cm/s up to relativistic velocities without the disturbance of the Rayleigh-Taylor instability. The acceleration occurs due to the radiation pressure of proper high power lasers. In these systems, the ablation force is negligible relative to the ponderomotive force that dominates the acceleration. The laser irradiances of 1017 W/cm2 < IL < 1021 W/cm2 with a pulse duration of the order of 10 picoseconds can accelerate a micro-foil by the laser radiation pressure to velocities as high as 109 cm/s before breaking by Rayleigh Taylor (RT) instability. Similarly, laser irradiances of IL > 1021 W/cm2 with pulse duration of the order of 10 femtoseconds can accelerate a micro-foil to relativistic velocities without RT breaking. Due to the nature of the accelerating ponderomotive force, in both the relativistic and non-relativistic cases, the structure of the accelerated target contains a double layer (DL) at the interface of the laser-target interaction. The DL acts as a piston during the acceleration process. The influence of the DL surface tension on the RT instability is also analyzed in this paper.

APA, Harvard, Vancouver, ISO, and other styles

47

Alamri, Sabri, Paul A. Sürmann, Andrés F. Lasagni, and Tim Kunze. "Interference-based laser-induced micro-plasma ablation of glass." Advanced Optical Technologies 9, no. 1-2 (February 25, 2020): 79–88. http://dx.doi.org/10.1515/aot-2019-0061.

Full text

Abstract:

AbstractGlass is one of the most important technical surfaces for numerous applications in automotive, optical, and consumer industries. In addition, by producing textured surfaces with periodic features in the micrometre range, new functions can be created. Although laser-based methods have shown to be capable to produce structured materials in a wide amount of materials, due to its transparency large bandgap dielectrics can be only processed in a controlled manner by employing high-power ultra-short pulsed lasers, thus limiting the employable laser sources. In this article, an interference-based method for the texturing of soda-lime glass using a 15 ns pulsed (1 kHz repetition rate) infrared (1053 nm) laser is proposed, which allows fabricating different periodic patterns with micrometre resolution. This method consists on irradiating a metallic absorber (stainless steel) put in direct contact with the glass sample and inducing locally an etching process on the backside of the glass. Then, the produced plasma at the interference maxima positions leads to the local fabrication of well-defined periodic line-like and dot-like surface patterns. The produced patterns are characterised using white light interferometry and scanning electron microscopy.

APA, Harvard, Vancouver, ISO, and other styles

48

Hu, Yong Xiang, Heng Zhang, and Zheng Qiang Yao. "Formation of Periodical Sub-Micron Sized Structures on Silicon by Interfered Nanosecond Laser Pulses." Advanced Materials Research 97-101 (March 2010): 3803–6. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3803.

Full text

Abstract:

Laser interference micro-structuring is a relatively efficient and cost-effective technique for fabricating periodical micro-nano-structuring surfaces. The direct fabrication of sub-micron sized dot array on silicon was performed by four interfering nanosecond laser beams with a diffractive beam splitter. The mechanism to form the dot array was analyzed and it was found that the obtained conical dot array had a negative shape of the interference pattern of four laser beams. A second-order peak between two first-order peaks also occurred due to the liquid-solid expansion.

APA, Harvard, Vancouver, ISO, and other styles

49

Zhang, W. W., J. J. Zhu, Winco K. C. Yung, and Simon S. Ang. "Fabrication of Biodegradable Polymeric Micro-Analytical Devices Using a Laser Direct Writing Method." Advanced Materials Research 136 (October 2010): 53–58. http://dx.doi.org/10.4028/www.scientific.net/amr.136.53.

Full text

Abstract:

Microfluidic channel and micro-cavities were fabricated from polyhydroxyalkanoate biodegradable polymer using a direct 20ns, 248 nm excimer laser writing method. First we give a design of the micro-analytical device; second we discussed the laser ablation of biodegradable ppolymer material. The morphology, dimensional accuracy, and surface conditions of the fabricated micro-devices were studied using atomic force microscopy, scanning electron microscopy, optical microscopy, and X-ray photoelectron spectroscopy. Melting of the biodegradable polymer was observed at a fluency of 50mJ/cm2 while ablation was observed at a fluency of 100mJ/cm2.The different width between bottom and top surface are studied in our research. The particle deposited on the polymer surface is seen from the SEM of 248nm laser ablation of PHA. However, the direct burning of PHA can be seen from the optical photo by 355nm laser. Compare to results of PHA with two different lasers, we can see that the 248nm laser is a suitable choice.

APA, Harvard, Vancouver, ISO, and other styles

50

Wei, Deng Hui, Jian Zhong Zhou, Shu Huang, Yu Jie Fan, and Min Wang. "Progress in Theory and Application Research on Microscale Laser Shock Peening." Advanced Materials Research 135 (October 2010): 194–99. http://dx.doi.org/10.4028/www.scientific.net/amr.135.194.

Full text

Abstract:

Micro-scale laser shock peening (μLSP) is a novel surface modification technique utilizing mechanical effect of shock wave induced by high intensity pulsed laser with micron spots. μLSP can introduce the beneficial residual compressive stress distribution in surface layers of metal with micron-level spatial resolution, and thus enhance wear resistance and fatigue performances of metallic micro-structures. The characteristics and influence factors of μLSP were briefly introduced, and progress in μLSP research fields was reviewed and presented, including laser induced shock pressure, material constitutive relation, changes of mechanical properties and microstructure evolution of materials. Finally, proposals on further investigations of μLSP were brought forward. The systematical characterization will lay the ground work for better understanding the effect of μLSP in microlength level and developing a more practical simulation method.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Laser micro'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles