An analytic investigation of the role of multimode pump laser intensity fluctuations in single-pulse coherent anti-Stokes Raman spectroscopy is presented. The results show that, given statistically independent sources with Gaussian statistics for the Stokes, the noise performance of multimode pump lasers, in principle, should be comparable with that of coherent sources. Pulses that are long compared with intermode beat periods and a large number of Stokes modes per detector pixel are required to minimize noise addition. Certain conditions under which multimode pumps could add noise are identified and discussed.
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Hall et al. (1986) studied this question.
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