Comparison of different phase conjugate and backscattering arrangements in non‐linear Raman spectroscopy

Abstract

AbstractA theoretical and experimental comparison of coherent anti‐Stokes Raman scattering (CARS) and Raman‐induced phase conjugation (RIPC) techniques has been carried out. In most cases the RIPC techniques are much more sensitive than CARS to deviations from the phase‐matching conditions, from which it follows that for RIPC much higher accuracy of the alignment and optical homogeneity are necessary. In practice, only one RIPC variant with nearly copropagating pump waves and contrapropagating Stokes waves is applicable to obtain complete spectra. A CARS reflection technique is discussed for the investigation of highly absorbing samples.