Results 261 to 270 of about 164,990 (313)
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Plasma assisted laser surface alloying
Journal of Laser Applications, 2003The combination of plasma arc with a Nd:YAG laser during surface alloying produces a synergistic effect which significantly increases the depth of the melt pool beyond that expected by a summation of the individual depths. Incremental increases in laser power produce larger depth changes than incremental increases in torch amperage.
M H Mccay
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Metal surface nitriding by laser induced plasma
Journal of Applied Physics, 1996We study a nitriding technique of metals by means of laser induced plasma. The synthesized layers are composed of a nitrogen concentration gradient over several μm depth, and are expected to be useful for tribological applications with no adhesion problem.
C Boulmer-Leborgne +2 more
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Laser induced plasma in the formation of surface-microstructured silicon
Materials Letters, 2008Abstract The plasma induced by femtosecond laser pulses irradiated on silicon surface has been investigated by optical emission spectroscopy. The plasma emission spectra show strong dependence on the structuring ambient gas species and pressure. Among the four ambient gases (SF 6 , N 2 , air and vacuum), the plasma obtained in sulfur hexafluoride (SF
Shuying Liu +3 more
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Laser ignition of plasma off aluminum surfaces
13th Fluid and PlasmaDynamics Conference, 1980The prompt initiation of a plasma above metal surfaces irradiated by a CO2 laser pulse in an intensity range of 106 -109 W/cm2 is modeled. The initiation mechanism is assumed to be the vaporization of flakes or surface defects that are thermally insulated from the bulk surface, followed by laser-induced breakdown in the vapor. The fluid dynamics of the
G. Weyl, A. Pirri, R. Root
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Surface plasma influence on nanosecond laser ablation
Applied Optics, 2019The comparison of laser ablation and plasma evolution has been carried out for a molten steel sample in the absence and in the presence of surface plasma. A continuous wave (cw) laser beam was utilized for local melting of a steel (Fe>99 wt.%) sample, but it also induced a surface plasma according to optical emission spectroscopy.
V. N. Lednev +5 more
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Laser surface wakefield in a plasma column
Physics of Plasmas, 2003The structure of the wakefield in a plasma column, produced by a short intense laser pulse, propagating through a gas affected by tunneling ionization is investigated. It is shown that besides the usual plasma waves in the bulk part of the plasma column [see Andreev et al., Phys.
L. M. Gorbunov +2 more
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Surface effects in laser interaction with overdense plasmas
AIP Conference Proceedings, 2002The dynamics and generation of surface structures in intense laser interaction with overdense plasmas is studied numerically and analytically. The dynamics of two-dimensional (2D) electron surface oscillations (ESOs) has been resolved in particle-in-cell simulations, showing a “period doubling” effect with respect to the driving magnetic force of the ...
A. MACCHI +6 more
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Kinetics of the formation of a surface laser plasma in the absence of surface damage
Soviet Journal of Quantum Electronics, 1987An analysis was made of the kinetics of the appearance of a plasma near the surface of a heated body. It was assumed that during the heating process the surface temperature did not exceed the boiling (sublimation) point at a given external pressure and there was no intense evaporation. A quasisteady-state breakdown model was developed for the case when
V S Vorob'ev, S V Maksimenko
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Effect of Surface Plasma on Nanosecond Laser Ablation
Bulletin of the Lebedev Physics Institute, 2018For the first time, the effect of target surface plasma on nanosecond laser ablation is studied. Surface plasma was generated by a high-power cw fiber laser beam incident on an iron target. A comparison of laser ablation by nanosecond Nd:YAG laser pulses (1064 nm, 5 ns) was performed upon exposure to the cw laser and during its short-term (5 ms) turn ...
V. N. Lednev +5 more
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