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CARS background from fiber over wavelength range. Spectra taken with detector directly in front of fiber, or through thin layer of DMSO in the case of DMSO (a) schematic to understand what is meant by pulse delay overlap. In the dispersive silica media, the two wavelengths travel at different speeds, allowing us to separate the pulses at one end of the fiber. (b) Example of CARS spectra with different delay overlap positions in both air and in DMSO for comparison.
