Focusing effects for nonlinear power generation are explicitly discussed for coherent anti-Stokes Raman spectroscopy (CARS). It is shown that very tight focusing only increases CARS power generation by about a factor of 4, while an extra λ−2 dependence introduced by focusing implies CARS signals scale with wavelength in the same manner as do the signals in normal spontaneous Raman scattering. Axial power generation in a gas phase medium is illustrated, and a modified plane wave approximation function is developed to analyze this behavior for loose focusing cases.
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Shaub et al. (1977) studied this question.
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