Laser Ablation of Ti-Al Alloy in Vacuum and Air Environments

2012 ◽  
Vol 217-219 ◽  
pp. 2257-2264 ◽  
Author(s):  
Yue Hua Liu ◽  
Xiang Dong Liu ◽  
Ming Chen ◽  
Ming Wen Zhao
Keyword(s):  
High Power ◽  
Laser Energy ◽  
Optical Emission ◽  
Target Surface ◽  
Al Alloy ◽  
Laser Irradiance ◽  
Air Plasma ◽  
High Power Laser ◽  
Power Laser ◽  
Plasma Parameters

The time-resolved optical emission spectroscopy of Ti-Al alloy plasma produced by the Nd:YAG high-power laser pulses with wavelength of 1064nm was investigated both in air and vacuum conditions. The comparative studies gave detailed insights that the plasmas produced in air were much hotter and denser. The quantitative descriptions indeed suggested that a cascade avalanche process would be happen followed by air plasma firstly, before the laser impacting the target surface. On the other hand, the laser energy may be considerably attenuated via hotter and denser plasma, the amount of laser energy on the target surface remarkably decreased in air condition. In addition, at high-power laser irradiance levels, there was an auto regulatory area near the target surface and the plasma parameters tend to be saturated

X-ray spectral measurement of high-temperature plasma parameters in porous targets irradiated with high-power laser pulses

2001 ◽  
Vol 31 (12) ◽  
pp. 1071-1074 ◽  
Author(s):  
V V Gavrilov ◽  
A Yu Gol'tsov ◽  
N G Koval'skii ◽  
S N Koptyaev ◽  
A I Magunov ◽  
...  
Keyword(s):  
High Temperature ◽  
High Power ◽  
Laser Pulses ◽  
Spectral Measurement ◽  
High Power Laser ◽  
Power Laser ◽  
Plasma Parameters ◽  
Temperature Plasma ◽  
X Ray ◽  
High Temperature Plasma

scholarly journals Numerical simulation of the effective input of laser energy into a cavity through a hole

1999 ◽  
Vol 17 (4) ◽  
pp. 785-791
Author(s):  
I.G. LEBO ◽  
S.YU. GUS'KOV ◽  
V.V. DEMCHENKO ◽  
V.V. NIKISHIN ◽  
V.F. TISHKIN ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Laser Pulse ◽  
Laser Beam ◽  
High Power ◽  
Laser Energy ◽  
Numerical Calculations ◽  
High Power Laser ◽  
Power Laser ◽  
High Power Laser Pulse

A possibility of input of high-power laser pulse into a cavity through a hole was studied by means of 2D numerical calculations. Such tasks appear in view of investigation of the effective targets with internal input of energy (Bessarab et al. 1992; Basov et al. 1998), “cannon-ball” (Hogan 1989), “Greenhouse” targets (Gus'kov et al. 1995).We have used two Euler codes “NUTCY” and “FAKEL” to model the problems of laser beam input into a cavity through the holes.

scholarly journals Plasma properties of a laser-ablated aluminum target in air

2003 ◽  
Vol 21 (1) ◽  
pp. 97-101 ◽  
Author(s):  
MINJU YING ◽  
YUEYUAN XIA ◽  
YUMING SUN ◽  
MINGWEN ZHAO ◽  
YUCHEN MA ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Optical Emission ◽  
Target Surface ◽  
Emission Lines ◽  
Laser Irradiance ◽  
Air Plasma ◽  
Plasma Properties ◽  
Spatially Resolved ◽  
Avalanche Process ◽  
Optical Emission Spectra

The optical emission spectra of the plasma generated by a 1.06-μm Nd:YAG laser irradiation of Al target in air was recorded and analyzed in a spatially resolved manner. Electron temperatures and densities in the plasma were obtained using the relative emission intensities and the Stark-broadened linewidths of Al(I) emission lines, respectively. The dependence of the electron density and temperature on the distance from the target surface and on the laser irradiance were manifested. We also discussed how the air takes part in the plasma evolution process and confirmed that the ignition of the air plasma was by the collisions between the energetic electrons and the nitrogen atoms through a cascade avalanche process.

Absolute absorbing high-power laser energy meter design and precision analysis

2009 ◽  
Author(s):  
Lei Wang ◽  
Rongguo Xu ◽  
Gaoping Li ◽  
Zhaojin Yang ◽  
Hongru Yang ◽  
...  
Keyword(s):  
High Power ◽  
Laser Energy ◽  
High Power Laser ◽  
Power Laser ◽  
Precision Analysis ◽  
Energy Meter

scholarly journals Resonant excitation of the upper hybrid wave by relativistic cross focusing of two laser beams

2009 ◽  
Vol 27 (3) ◽  
pp. 429-437 ◽  
Author(s):  
Gunjan Purohit ◽  
Prashant Chauhan ◽  
R.P. Sharma
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
High Power ◽  
Resonant Excitation ◽  
Laser Beams ◽  
High Power Laser ◽  
Hybrid Wave ◽  
Power Laser ◽  
Plasma Parameters ◽  
Hybrid Frequency

AbstractThis article presents the resonant excitation of the upper hybrid wave (UHW) by cross focusing of two high power laser beams in a collisionless hot magnetoplasma; taking into account the relativistic nonlinearity. The electric vectors of the two beams are polarized along uniform static magnetic field and the beams propagate perpendicular to the static magnetic field. The resonant excitation of the UHW occurs when the frequency difference (FD) of the two laser beams and difference of their propagation vector satisfy the dispersion relation corresponding to the UHW. It has been observed that the power associated with the excited UHW, which depends on the background electron concentration, magnetic field and the intensity of the two laser beams, becomes drastically modified with the distance of propagation. The effect of the excited UHW at the FD on the acceleration of electrons has also been discussed. The amplitude of the UHW, excited by two high power laser beams and the electron energy are also calculated. This study is relevant in heating of plasma near the upper hybrid frequency as well as electron acceleration. The results are presented for typical laser plasma parameters.

THz generation by the beating of two high intense laser beams

2013 ◽  
Vol 79 (5) ◽  
pp. 657-660 ◽  
Author(s):  
RABEA Q. NAFIL ◽  
MONIKA SINGH ◽  
A. H. AL-JANABI ◽  
R. P. SHARMA
Keyword(s):  
High Power ◽  
Intense Laser ◽  
Laser Beams ◽  
Thz Radiation ◽  
Electron Mass ◽  
Nonlinear Coupling ◽  
High Power Laser ◽  
Static Electric Field ◽  
Power Laser ◽  
Plasma Parameters

AbstractThe nonlinear coupling of two high-power laser beams in plasmas in the presence of a transverse, static electric field is investigated to generate a difference frequency terahertz (THz) radiation. The relativistic variation of electron mass in the presence of two high-power laser beams is responsible for producing a nonlinear current driving the THz radiation. For typical laser and plasma parameters, we report the efficiency of the order of ~10−4 for the current scheme.

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