Physics – Optics
Scientific paper
2004-02-29
Physics
Optics
8 pages, 4 figures
Scientific paper
10.1063/1.1829162
A major impediment of using Coherent Anti-Stokes Raman Scattering to identify biological molecules is that the illumination levels required to produce a measurable signal often also produce significant nonresonant background from the medium, especially from water, that is not specific to the resonance being investigated. We present a method of using nonlinear interferometry to measure the temporal shape of the anti-Stokes signal to differentiate which components are resonant and nonresonant. This method is easily adaptable to most existing pulsed CARS illumination methods and should allow for distinguishing resonant CARS when using higher energy pulses. By examining the differences between signals produced by acetone and water, we show that the resonant and nonresonant signals can be clearly differentiated.
Boppart Stephen A.
Bredfeldt Jeremy S.
Marks Daniel L.
Vinegoni Claudio
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