Figure 3. Continuous time-domain CARS interferograms of liquid toluene obtained by the rapid-scanning FT-CARS system.

The CARS interferograms are continuously measured every 41.7 μs. The large peaks that appear every 83.3 μs are caused by the non-resonant background due to the zero time delay between the interferometer arms and are removed to avoid spectral distortions. The inset shows a zoom of the CARS interferogram.