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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 13 — May. 1, 2013
  • pp: 3048–3057

Femtosecond laser-induced breakdown spectroscopy of surface nitrate chemicals

Tariq Ahmido, Antonio Ting, and Prabhakar Misra  »View Author Affiliations


Applied Optics, Vol. 52, Issue 13, pp. 3048-3057 (2013)
http://dx.doi.org/10.1364/AO.52.003048


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Abstract

Ultrashort laser-induced breakdown spectroscopy was used to detect the emission radiation from the breakdown of surface contaminants by a femtosecond laser pulse. This study focused on the detection of visible to near-infrared radiation signatures from molecular fragments of the nitro (NOx) group present in the breakdown plasma, where target chemicals of potassium nitrate (KNO3) and sodium nitrate (NaNO3) were used. Spectral signatures at a wavelength region around 410 nm were observed for both KNO3 and NaNO3, and were identified as the fluorescence transitions of the NOx-molecular structures. The signatures obtained were systematically analyzed and studied as functions of laser parameters. It is shown that for laser parameters used in this study, laser pulse durations 1ps were not as effective as shorter pulses in generating these signatures. A visible wavelength NOx signature and the extended high-intensity propagation of a femtosecond laser could be advantageous to detecting nitro-group energetic materials at standoff distances.

© 2013 Optical Society of America

OCIS Codes
(320.7150) Ultrafast optics : Ultrafast spectroscopy
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown

ToC Category:
Spectroscopy

History
Original Manuscript: January 14, 2013
Revised Manuscript: March 27, 2013
Manuscript Accepted: April 3, 2013
Published: April 26, 2013

Citation
Tariq Ahmido, Antonio Ting, and Prabhakar Misra, "Femtosecond laser-induced breakdown spectroscopy of surface nitrate chemicals," Appl. Opt. 52, 3048-3057 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-13-3048


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