Low wavenumber efficient single-beam coherent anti-Stokes Raman scattering using a spectral hole.
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We demonstrate an approach to detect low wavenumber vibrational signals based on single-beam coherent anti-Stokes Raman scattering (CARS) with a spectral hole. Using a 4f pulse shaper for both pulse shaping and signal collection, we achieve an enhanced efficiency in collecting back-reflected CARS signals.