Coherent mode-selective Raman excitation towards standoff detection.
We report the detection of characteristic Raman lines for several chemicals using a single-beam coherent anti-Stokes Raman scattering (CARS) technique from a 12 meter standoff distance. Single laser shot spectra are obtained with sufficient signal to noise ratio to allow molecular identification. Background and spectroscopic discrimination are achieved through binary phase pulse shaping for optimal excitation of a single vibrational mode. These results provide a promising approach to standoff detection of chemicals, hazardous contaminants, and explosives.
Li
Haowen
H
BioPhotonic Solutions Inc., Okemos, MI 48864, USA.
Harris
D Ahmasi
DA
Xu
Bingwei
B
Wrzesinski
Paul J
PJ
Lozovoy
Vadim V
VV
Dantus
Marcos
M
D000465:Algorithms; D004784:Environmental Monitoring / Q000379:methods*; D007834:Lasers; D013058:Mass Spectrometry / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000379:methods*