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A simulation of the pulse combination used to differentiate between resonant and nonresonant signals. The pump∕Stokes combination overlap to excite CARS, and the anti-Stokes would appear similar to the shown wave form for resonant or nonresonant media.
Schematic of optical setup used to measure the interferogram of resonant and nonresonant signals.
Partial Raman spectrum of acetone (upper left), and the cross-correlation interferogram of four-wave mixing in acetone at various vibrational excitation frequencies (a)–(c).
Interferogram of nonresonant four-wave mixing in water (inset), and the power of the resonant anti-Stokes signal for various percentages of acetone in water by volume.
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