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A major impediment of using Coherent Anti-Stokes Raman Scattering to identifybiological molecules is that the illumination levels required to produce ameasurable signal often also produce significant nonresonant background fromthe medium, especially from water, that is not specific to the resonance beinginvestigated. We present a method of using nonlinear interferometry to measurethe temporal shape of the anti-Stokes signal to differentiate which componentsare resonant and nonresonant. This method is easily adaptable to most existingpulsed CARS illumination methods and should allow for distinguishing resonantCARS when using higher energy pulses. By examining the differences betweensignals produced by acetone and water, we show that the resonant andnonresonant signals can be clearly differentiated.Comment: 8 pages, 4 figure

Interferometric differentiation between resonant coherent anti-Stokes Raman scattering and nonresonant four-wave-mixing processes