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. - Highlights: • Role of pre-pulse wavelength and inter-pulse delay on LIBS sensitivity was studied. • For NIR:NIR combination, dual peaks in signal enhancement were observed. • UV:NIR combination resulted in maximum
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Citation Formats
Diwakar, P.K., E-mail: pdiwakar@purdue.edu, Harilal, S. S., Freeman, J. R., and Hassanein, A.
Role of laser pre-pulse wavelength and inter-pulse delay on signal enhancement in collinear double-pulse laser-induced breakdown spectroscopy.
Netherlands: N. p.,
2013.
Web.
doi:10.1016/J.SAB.2013.05.015.
Diwakar, P.K., E-mail: pdiwakar@purdue.edu, Harilal, S. S., Freeman, J. R., & Hassanein, A.
Role of laser pre-pulse wavelength and inter-pulse delay on signal enhancement in collinear double-pulse laser-induced breakdown spectroscopy.
Netherlands.
https://doi.org/10.1016/J.SAB.2013.05.015
Diwakar, P.K., E-mail: pdiwakar@purdue.edu, Harilal, S. S., Freeman, J. R., and Hassanein, A.
2013.
"Role of laser pre-pulse wavelength and inter-pulse delay on signal enhancement in collinear double-pulse laser-induced breakdown spectroscopy."
Netherlands.
https://doi.org/10.1016/J.SAB.2013.05.015.
@misc{etde_22336696,
title = {Role of laser pre-pulse wavelength and inter-pulse delay on signal enhancement in collinear double-pulse laser-induced breakdown spectroscopy}
author = {Diwakar, P.K., E-mail: pdiwakar@purdue.edu, Harilal, S. S., Freeman, J. R., and Hassanein, A.}
abstractNote = {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. - Highlights: • Role of pre-pulse wavelength and inter-pulse delay on LIBS sensitivity was studied. • For NIR:NIR combination, dual peaks in signal enhancement were observed. • UV:NIR combination resulted in maximum absolute signal intensity. • Persistence of neutral species was increased for double pulse.}
doi = {10.1016/J.SAB.2013.05.015}
journal = []
volume = {87}
journal type = {AC}
place = {Netherlands}
year = {2013}
month = {Sep}
}
title = {Role of laser pre-pulse wavelength and inter-pulse delay on signal enhancement in collinear double-pulse laser-induced breakdown spectroscopy}
author = {Diwakar, P.K., E-mail: pdiwakar@purdue.edu, Harilal, S. S., Freeman, J. R., and Hassanein, A.}
abstractNote = {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. - Highlights: • Role of pre-pulse wavelength and inter-pulse delay on LIBS sensitivity was studied. • For NIR:NIR combination, dual peaks in signal enhancement were observed. • UV:NIR combination resulted in maximum absolute signal intensity. • Persistence of neutral species was increased for double pulse.}
doi = {10.1016/J.SAB.2013.05.015}
journal = []
volume = {87}
journal type = {AC}
place = {Netherlands}
year = {2013}
month = {Sep}
}