Journal
LASER PHYSICS LETTERS
Volume 12, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1612-2011/12/6/066102
Keywords
collinear configuration; iron plasma; plasma parameters; atmospheric pressure LIBS; laser pulse energy ratio; interpulse delay
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Funding
- higher education commission (HEC)
- Pakistan Science Foundation [134]
- Quaid-i-Azam University Islamabad
- National Centre for Physics (NCP) Islamabad, Pakistan
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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.
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