Fig. 1.

(a) Numerical simulation of a CARS spectrum via a coherent addition of multiple Lorentzian lineshape functions and a variable nonresonant background (dashed). (b) Temporal function η(t:ln|χ(ω)|), obtained by modified time-domain constraint shown in Eq. (7). Inset, temporal function ${\mathfrak{J}}^{-1}\left[f\left(\omega \right)\right]$, obtained without NRB information. (c) (top) Extracted Raman spectrum (solid) and the reference Raman spectrum (dashed); (bottom) difference between the reference and retrieved Raman spectra. Inset, Raman spectrum extracted using ${\mathfrak{J}}^{-1}\left[f\left(\omega \right)\right]$ from the inset of panel (b).