Effects of laser wavelengths and pulse energy ratio on the emission enhancement in dual pulse LIBS

We present new studies on the effects of laser wavelengths, pulse energy ratio and interpulse delay between two laser pulses in the collinear dual pulse configuration of laser-induced breakdown spectroscopy (LIBS) on an iron sample in air using the fundamental (1064 nm) and the second harmonics (532...

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Bibliographic Details
Published in:Laser physics letters 2015-06, Vol.12 (6), p.66102
Main Authors: Ahmed, Rizwan, Iqbal, Javed, Baig, M Aslam
Format: Article
Language:English
Subjects:
atmospheric pressure LIBS
collinear configuration
interpulse delay
iron plasma
laser pulse energy ratio
plasma parameters
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Summary:We present new studies on the effects of laser wavelengths, pulse energy ratio and interpulse delay between two laser pulses in the collinear dual pulse configuration of laser-induced breakdown spectroscopy (LIBS) on an iron sample in air using the fundamental (1064 nm) and the second harmonics (532 nm) of Nd:YAG lasers. In the dual pulse LIBS, an optimum value of interpulse delay with an appropriate combination of laser wavelengths, and laser pulse energy ratio, yields a 30 times signal intensity enhancement in the neutral iron lines as compared with single pulse LIBS. A comparison in the spatial variations of electron temperature along the axis of the plume expansion in single and double pulse LIBS has also been studied.
ISSN:1612-2011
1612-202X
DOI:10.1088/1612-2011/12/6/066102