  We have developed an interferometric implementation of coherent anti-Stokes
Raman scattering (CARS) which enables broadband coherent Raman spectroscopy
free from non-resonant background (NRB), with a signal strength proportional to
concentration. Spectra encode mode symmetry information into the amplitude
response which can be directly compared to polarised spontaneous Raman spectra.
The method requires only passive polarisation optics and is suitable for a wide
range of laser linewidths and pulse durations

Optics