Abstract
The resonance CARS spectrum of rhodamin 6G in PMMA matrix, obtained at excitation in the 580 nm region, shows s strong dependence of Raman line shapes on dye concentration for dye lines as well as for solvent lines. To explain these results the electronic background contribution from the dye to 3rd order CARS susceptibility has to be taken into consideration. The qualitative analysis of the experimental results gives magnitude and sign of the background contribution being in agreement with theoretical expectation.
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