A study of single-beam femtosecond MCARS in trace material detection

Stephen D. Roberson; Sherrie S. Bowman; Paul M. Pellegrino

doi:10.1117/12.2181051

2 June 2015 A study of single-beam femtosecond MCARS in trace material detection

Stephen D. Roberson, Sherrie S. Bowman, Paul M. Pellegrino

Proceedings Volume 9455, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI; 94550X (2015) https://doi.org/10.1117/12.2181051
Event: SPIE Defense + Security, 2015, Baltimore, MD, United States

Abstract

There is a need for rapid and accurate detection and identification of complex aerosol particles in a number of fields for countless applications. Full identification of these particles has been hampered by the inability to use an information-rich spectroscopic method such as Raman scattering in a flowing aerosol environment due to the time needed to generate a Raman spectrum. Multiplex coherent anti-Stokes Raman spectroscopy (MCARS) has been shown to generate a complete Raman spectrum from the material of interest using a single ultrabroadband pulse to coherently drive multiple molecular vibrations simultaneously. When used in conjunction with a narrow probe pulse, a complete Raman spectrum is created that can be detected in milliseconds. We will report on the MCARS spectra obtained from materials of interest at a distance of 1 m from the sample location. A limit of detection study of the MCARS spectrum of various materials of interest will be also reported in with the nonresonant background both present and removed. Additionally, a limit of detection study as a function of the number of pulses used to comprise the CARS spectrum of the materials of interest will be presented.

Citation Download Citation

Stephen D. Roberson, Sherrie S. Bowman, and Paul M. Pellegrino "A study of single-beam femtosecond MCARS in trace material detection", Proc. SPIE 9455, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI, 94550X (2 June 2015); https://doi.org/10.1117/12.2181051

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