Abstract
The statistical properties of CARS light generated by the mixing of incoherent pump and Stokes sources have been investigated analytically. The intensity probability densities for CARS generation from the nonresonant susceptibility are presented for several cases. It is shown that when second harmonic generation is used to provide pump sources of the right frequency, the resulting non-gaussian intensity fluctuations give rise to large enhancements of the nonresonant signal. The magnitude of the effect is dependent on the conversion efficiency of the frequency-doubling process, and is in good agreement with experiment.
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