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Induced evaporation of metal from an aluminum surface by a normal pulse neodymium laser

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Naval Postgraduate School , Monterey, California
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Thesis (M.S. in Phys.)--Naval Postgraduate School, Pages: Laser ablation is the ejection of macroscopic amounts of materials from the surface of a solid induced by the interaction of short (~10 −13 to 10 −8 s), intense (~10 6 to 10 14 W/cm 2) laser pulses with the surface [59].

This can occur in any medium like vacuum, gas, and liquid, providing that the gas or liquid does not strongly attenuate. Laser induced forward transfer (LIFT) is a freeform, additive patterning technique used to deposit high resolution structures from a transparent carrier substrate, with a metal film donor.

A laser. The aluminium ablation depth per pulse for test group C at 1 m s −1 is within 20% of the values presented by Colina et al. [15] for single pulses of duration 10 ns and wavelength m. When focused onto a black anodized surface, the laser pulse would vaporize the anodized coating, resulting in little jets of flame.

(From: Harvey Rutt (@).) CO2 TEA lasers operated with a normal gas mix typically produce a 'spike and tail' output, with ~~1/3 of the energy in the ~~nS spike, and 2/3 in the few hundred ns.

Non-equilibrium two-dimensional thermal evolutions in target materials irradiated by fs laser pulse Laser and Particle Beams, 32, 33 link. Hu A. and Hassanein A. () Modeling hydrogen isotope behavior in fusion plasma-facing components Journal of Nuclear Materials PDF.

Farid, N, Harilal S.S., O. El-Atwani, Ding H., and Hassanein A. Evaporation-induced recoil pressure exceeds the highest possible value of surface tension pressure during laser beam processing, i.e., drilling, cutting, marking, welding, cladding, etc.

During laser material processing, recoil pressure plays an important role in melt expulsion from machining zone (Steen, ).Author: N.

Roy, A.S. Kuar, S. Mitra. Laser-Induced Breakdown Spectroscopy Jagdish P. Singh, Surya Narayan Thakur Laser induced breakdown spectroscopy (LIBS) is basically an emission spectroscopy technique where atoms and ions are primarily formed in their excited states as a result of interaction between a tightly focused laser beam and the material sample.

Advanced Search >. Home > Proceedings > Volume > Proceedings > Volume This model allows for the heating and evaporation of the target and for the absorption of the laser radiation in the moving vapor whose state is described in the two-temperature approximation.

Use is made of the experimental shapes of the laser radiation pulses of 1– MW/cm 2 intensity and –10 μ sec duration. The calculated plasma. Mathematical simulation is employed to investigate the dynamics of evaporation and condensation on the surface of a metal target under the conditions of plasma production in the vaporised material exposed to the {mu}m UV radiation of a KrF laser with the intensity G{sub 0}= 2x10{sup 8}{sup 9} W cm{sup -2}, and a pulse duration {tau.

The ability of short pulse laser ablation in liquids to produce clean colloidal nanoparticles and unusual surface morphology has been employed in a broad range of practical applications.

In this paper, we report the results of large-scale molecular dynamics simulations aimed at revealing the key processes that control the surface morphology and nanoparticle size distributions by pulsed laser Cited by: Proc.

SPIE.Laser-induced Damage in Optical Materials KEYWORDS: Laser induced damage, High power lasers, Laser applications, Resistance, Scanning electron microscopy, Laser irradiation, LCDs, Pulsed laser operation, Temperature metrology, Absorption. Due to their special physical and chemical properties and potential applications from hydrogen storage to medical implantation, the carbon-based nanomaterials are in the frame of attention for many research groups all over the world.

As synthesis techniques, we highlight arc discharge, chemical vapor deposition (CVD) and laser ablation.

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Even an expensive technique, laser ablation is suitable Cited by: 1. Nd:YVO 4 (Neodymium doped Yttrium orthoVanadate) is currently one of the most efficient laser crystal for diode laser-pumped solid-state lasers especially used in end-pumping configurations. The Nd:YVO 4 crystal has large stimulated emission cross-sections at both 1, nm and 1, nm.

According to Posten et al, there are several parameters of importance: a) Power output of laser being to Watts; b) Wavelength in the range ofnm; c) Pulse rate from 0, meaning continuous to Hertz (cycles per second); d) intensity of W/cm(2) and dose of to J/cm 2.

Most common methods of administering. Abstract. The CMO YAG laser damage test facility, which is equipped with a 30Hz laser, is presented in this paper. The main points are described below: (1) The characteristics of the laser beam and the in situ damage detection technique (a scattered light measurement system) are perfectly suited to work up to the frequency of the laser.

Full text of "Laser induced damage in optical materials: " See other formats. This book describes the basic mechanisms, theory, simulations and technological aspects of Laser processing techniques. It covers the principles of laser quenching, welding, cutting, alloying, selective sintering, ablation, etc.

The main attention is paid to the quantitative description. The existence of gas inclusions in the base metal is another important factor in contributing to the formation of large pores during Nd:YAG laser welding of magnesium alloys (Zhao and Debroy, ).

As shown in Fig. 14a hydrogen porosity is the dominant pore in laser welded die-cast magnesium alloys because of their extremely high initial gas Cited by: 9. Laser beam welding (LBW) is a welding technique used to join pieces of metal or thermoplastics through the use of a beam provides a concentrated heat source, allowing for narrow, deep welds and high welding rates.

The process is frequently used in high volume applications using automation, as in the automotive is based on keyhole or penetration mode welding. It was a metal plate (1) placed on an upper moving arm (5), in the middle of which was a dismountable metal casing (2) with a bevel-like top.

At the top of the casing, an impact surface (3) was attached and connected to a tensometric pressure sensor placed inside the casing. The impact surface was circular with a diameter of 12 by: 1. Volume I, Section 5 5 NATURAL AND INDUCED ENVIRONMENTS {A} For a description of the notations, see Acceleration Regimes.

This section contains the following topics: Atmosphere Microgravity Acceleration Acoustics Vibration Deleted Radiation Thermal Environment Combined Environmental Effects.

See the video clips associated with this section. Laser machining is an emerging area with a wide variety of applications, ranging from bulk machining in metal forming to micromachining and microstructuring in electronics and biomedical applications. The unique properties of lasers allow for use in flexible manufacturing techniques such as laser-assisted mechanical machining (LAM) and laser.

Now laser pulse #2 arrives, Aluminum alloys will get drilled to 19 cm and cm across, with possible permanent deformation out to cm diameter.

In metal, the surface of the drill-hole tapers inward. This intercepts more and more of the beam. The losses are not as bad as it might seem at first, because the sides are still somewhat.

Development Document For The Final Effluent Limitations Guidelines and Standards For The Metal Products & Machinery Point Source Category EPAB Christine Todd Whitman Administrator G.

Tracy Mehan, m Assistant Administrator, Office of Water Geoffrey H. Grubbs Director, Office of Science and Technology Sheila E.

Frace Director, Engineering and Analysis Division Marvin Rubin. A laser material processing system and method are provided. A further aspect of the present invention employs a laser for micromachining.

In another aspect of the present invention, the system uses a hollow waveguide. In another aspect of the present invention, a laser beam pulse is given broad bandwidth for workpiece by: Metal films of nanoscale thickness, deposited on substrates and exposed to laser heating, provide systems that involve several interesting multiphysics effects.

In addition to fluid mechanical aspects associated with a free boundary setup, other relevant physical effects include phase change, thermal flow, and liquid–solid interactions. Such films are challenging to model, in particular.

Overview: This book will contribute to develop and to apply corrosion engineering control methods and techniques, in particular those being environment-friendly.

In this crucial time of worldwide energy crisis and economic turmoil, cost effective corrosion control will extend the life of the infrastructure saving large expenses in materials. excimer-laser-induced fragmentation FARLIF.

fuel–air ratio by laser-induced fluorescence neodymium-doped yttrium aluminum garnet OH. hydroxide,weg Assessment of crossed-plane tomography for flamelet surface normal measurements, Combust.

Description Induced evaporation of metal from an aluminum surface by a normal pulse neodymium laser PDF

Sci. Technol.– () Google Scholar. In a preferred embodiment, improved macroscopic surface roughness characteristics are also obtained by shorter-duration melting, typically by means of a pulsed YAG laser. Gold which has been electroplated onto copper alloys prepared by this technique has shown improved resistance to sulfur and chlorine corrosive atmospheres.Laser (capacitive position transducer) Masked surface Laser power: 75 kW for µm-thick mask Lens CO2 laser Mask Air (cooling) Constant Aluminum Laser cutting of masks for CHM of large surfaces (Tlusty, ).

Figure Chemical Processes 61 Process parameters. Nanomaterials book 1. Edited by Subhash Chandra Singh, Haibo Zeng, Chunlei Guo, and Weiping Cai Nanomaterials 2. Related Titles Byrappa, K., Adschiri, T.

Hydrothermal Technology for Nanomaterials Processing ISBN: Kannatey-Asibu, E. Principles of Laser Materials Processing ISBN: Fuchs, H.

(ed.) Nanotechnology Volume 6: .