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Time-delayed coherent Raman spectroscopy

2008; Taylor & Francis; Volume: 106; Issue: 2-4 Linguagem: Inglês

10.1080/00268970801961005

1362-3028

Jennifer P. Ogilvie, Meng Cui, Dmitry Pestov, Alexei V. Sokolov, Marlan O. Scully,

Spectroscopy and Quantum Chemical Studies

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.