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Role of laser pre-pulse wavelength and inter-pulse delay on signal enhancement in collinear double-pulse laser-induced breakdown spectroscopy
| Content Provider | Semantic Scholar |
|---|---|
| Author | Diwakar, Prasoon K. Harilal, Sivanandan S. Freeman, Joshua R. Hassanein, Ahmed |
| Copyright Year | 2013 |
| Abstract | Abstract Dual-pulse (DP) laser-induced breakdown spectroscopy (LIBS) provides significant improvement in signal intensity as compared to conventional single-pulse LIBS. We investigated collinear DPLIBS experimental performance using various laser wavelength combinations employing 1064 nm, 532 nm, and 266 nm Nd:YAG lasers. In particular, the role of the pre-pulse laser wavelength, inter-pulse delay times, and energies of the reheating pulses on LIBS sensitivity improvements is studied. Wavelengths of 1064 nm, 532 nm, and 266 nm pulses were used for generating pre-pulse plasma while 1064 nm pulse was used for reheating the pre-formed plasma generated by the pre-pulse. Significant emission intensity enhancement is noticed for all reheated plasma regardless of the pre-pulse excitation beam wavelength compared to single pulse LIBS. A dual peak in signal enhancement was observed for different inter-pulse delays, especially for 1064:1064 nm combinations, which is explained based on temperature measurement and shockwave expansion phenomenon. Our results also show that 266 nm:1064 nm combination provided maximum absolute signal intensity as compared to 1064 nm:1064 nm or 532 nm:1064 nm. |
| Starting Page | 65 |
| Ending Page | 73 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.sab.2013.05.015 |
| Alternate Webpage(s) | https://engineering.purdue.edu/CMUXE/Publications/Harilal/2013-SCAB-Prasoon.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/j.sab.2013.05.015 |
| Volume Number | 87 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
