期刊
LASER PHYSICS LETTERS
卷 12, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1612-2011/12/6/066102
关键词
collinear configuration; iron plasma; plasma parameters; atmospheric pressure LIBS; laser pulse energy ratio; interpulse delay
资金
- higher education commission (HEC)
- Pakistan Science Foundation [134]
- Quaid-i-Azam University Islamabad
- National Centre for Physics (NCP) Islamabad, Pakistan
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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