Time-delayed coherent Raman spectroscopy
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Incoherent Raman spectroscopy is a widely used tool in physical and chemical science. Coherent Raman spectroscopy, e.g. CARS (coherent anti-Stokes Raman scattering) on the other hand has not been as widely adopted. One reason for this is the well-known 'nonresonant background' originating from both solvent and target molecules, due to the instantaneous electronic response and multiple off-resonant vibrational modes. However, with the advent of short and ultrashort pulsed lasers the CARS technique is now being applied to microscopy and the detection of anthrax-type endospores via various extensions of coherent spectroscopy. With such applications in mind, a simple physical picture of CARS spectroscopy is presented, having much in common with Dicke superradiance. Recent work is discussed that provides an effective method for mitigation of the background noise.
author list (cited authors)
Ogilvie, J. P., Cui, M., Pestov, D., Sokolov, A. V., & Scully, M. O.
complete list of authors
Ogilvie, Jennifer P||Cui, Meng||Pestov, Dmitry||Sokolov, Alexei V||Scully, Marlan O