Use of Spectral Lines of a Pure Ti Target for the Spectroscopic Diagnostics of the Laser Induced Plasma in Vacuum

2007 ◽  
Author(s):  
H. Hegazy ◽  
H. Sharkawy ◽  
Th. M. EL Sherbini
Keyword(s):  
Spectral Lines ◽  
Laser Induced Plasma ◽  
Spectroscopic Diagnostics

The Effect of Laser Focus Position on Laser Induced Plasma Characteristics

2014 ◽  
Vol 1035 ◽  
pp. 508-513
Author(s):  
Meng Ke Lu ◽  
Shu Rui Zhao ◽  
Kui Wen Guan ◽  
Yan Ling Wang
Keyword(s):  
Short Pulse ◽  
Detection System ◽  
Spectral Lines ◽  
The Self ◽  
Focus Position ◽  
Laser Induced Plasma ◽  
Photoelectric Detection ◽  
Complex Process ◽  
Laser Focus ◽  
Plasma Characteristics

Laser induced plasma is a relatively complex process which is closely related to many factors. In this paper, using a short pulse Nd:YAG laser and CCD photoelectric detection system, the variation of laser focus position effected by spectral intensity, the ratio of signal to background as well as the self-absorption of the plasma spectral lines with the standard spectra sample of aluminum for analysis samples was studied. Results show that: when the laser focus position is about 5mm under the surface of the sample, the relative intensity and the ratio of signal to background of the spectral lines are the strongest, and the spectral lines are sharp without obvious self-absorption.

scholarly journals The effect of hyperfine splitting on Stark broadening for three blue-green Cu i lines in laser-induced plasma

2019 ◽  
Vol 488 (4) ◽  
pp. 5594-5603 ◽  
Author(s):  
A M Popov ◽  
N I Sushkov ◽  
S M Zaytsev ◽  
T A Labutin
Keyword(s):  
Hyperfine Splitting ◽  
Stark Effect ◽  
Stellar Atmospheres ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Laser Induced Plasma ◽  
Radiation Sources ◽  
And Shifts ◽  
First Time ◽  
Existing Data

ABSTRACT Stark effect is observed in many natural and artificial plasmas and is of great importance for diagnostic purposes. Since this effect alters profiles of spectral lines, it should be taken into account when assessing chemical composition of radiation sources, including stars. Copper is one of the elements which studies of stellar atmospheres deal with. To this end, UV and visible Cu lines are used. However, there is a lack of agreement between existing data on their Stark parameters. It is therefore of interest to obtain new experimental data on these lines and to compare them to previous results. In this work, we have estimated Stark widths and shifts for three blue-green lines at 5105.54, 5153.24, and 5218.20 Å (corresponding transitions are [3d104p] 2P° → [3d94s2] 2D and [3d104d] 2D → [3d104p] 2P°) observed in a ‘long-spark’ laser-induced plasma. For the first time, we have accurately estimated an impact of hyperfine splitting on the profile shapes of the studied lines taking also into account the isotope shifts. We have shown that both effects considerably influence shift and width of Cu i line at 5105.54 Å, and shifts of Cu i lines at 5153.24 and 5218.20 Å.

scholarly journals Measurement of electronic temperature of laser-induced plasma channels at various pressures in argon by relative intensities of spectral lines

2019 ◽  
Vol 1331 ◽  
pp. 012018
Author(s):  
M A Tarasova ◽  
D A Kochuev ◽  
A F Galkin ◽  
D G Vasilchenkova ◽  
A S Chernikov ◽  
...  
Keyword(s):  
Spectral Lines ◽  
Electronic Temperature ◽  
Laser Induced Plasma ◽  
Plasma Channels

Determination of the Maximum Temperature at the Center of an Optically Thick Laser-Induced Plasma Using Self-Reversed Spectral Lines

2004 ◽  
Vol 58 (9) ◽  
pp. 1023-1031 ◽  
Author(s):  
I. B. Gornushkin ◽  
N. Omenetto ◽  
B. W. Smith ◽  
J. D. Winefordner
Keyword(s):  
Spectral Lines ◽  
Maximum Temperature ◽  
Laser Induced Plasma

Study on a Method to Measure Welding Arc Plasma Axis Temperature at Fixed Point

2011 ◽  
Vol 301-303 ◽  
pp. 954-958
Author(s):  
Zhi Li Yu ◽  
Feng Gui Lu ◽  
An Hua Liu
Keyword(s):  
Fixed Point ◽  
Imaging System ◽  
Spectral Lines ◽  
Mobile Platform ◽  
Arc Plasma ◽  
Double Line ◽  
Spectroscopic Diagnostics ◽  
Line Method ◽  
Welding Arc ◽  
Specific Position

In this page, arc imaging system was estabished with the double agglutination lens ,screen , dimmer glasses, aperture and precise mobile platform. The imaging system was aligned by laser, so that clear and magnified image could be shown on receiving screen basing on this system which is helpful for the specific position of measuring temperature . Spectroscopic diagnostics about welding arc plasma were carried out with this system and spectrometer HR4000CG-UV-NIR . Argon I spectral lines were chosen for calculation from welding arc spectrum collected and the modified double-line method was used to calculate arc temperature . The arc temperature measured with this method in this paper is similar to the result reported in the literatures. The experiment results show that the system established to measure the arc plasma axis temperature at fixed point is possible.

Spectroscopic diagnostics of laser induced plasma and self-absorption effects in Al lines

2018 ◽  
Vol 25 (7) ◽  
pp. 073303 ◽  
Author(s):  
Nursalwanie Mohd Sabri ◽  
Zuhaib Haider ◽  
Kashif Tufail ◽  
Fairuz Diyana Ismail ◽  
Jalil Ali
Keyword(s):  
Laser Induced Plasma ◽  
Spectroscopic Diagnostics

scholarly journals Determination of Stark parameters by cross-calibration in a multi-element laser-induced plasma

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Hao Liu ◽  
Benjamin S. Truscott ◽  
Michael N. R. Ashfold
Keyword(s):  
Free Choice ◽  
Local Thermodynamic Equilibrium ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Laser Induced Plasma ◽  
Model Free ◽  
Charge States ◽  
Cross Calibration

Abstract We illustrate a Stark broadening analysis of the electron density N e and temperature T e in a laser-induced plasma (LIP), using a model free of assumptions regarding local thermodynamic equilibrium (LTE). The method relies on Stark parameters determined also without assuming LTE, which are often unknown and unavailable in the literature. Here, we demonstrate that the necessary values can be obtained in situ by cross-calibration between the spectral lines of different charge states, and even different elements, given determinations of N e and T e based on appropriate parameters for at least one observed transition. This approach enables essentially free choice between species on which to base the analysis, extending the range over which these properties can be measured and giving improved access to low-density plasmas out of LTE. Because of the availability of suitable tabulated values for several charge states of both Si and C, the example of a SiC LIP is taken to illustrate the consistency and accuracy of the procedure. The cross-calibrated Stark parameters are at least as reliable as values obtained by other means, offering a straightforward route to extending the literature in this area.

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