Abstract
We analyze the estimation of the third-order susceptibility χ(3) of nonlinear optical (NLO) materials by means of a Hilbert transformation applied to their optical four-wave mixing spectra. In particular, the coherent anti-Stokes Raman scattering (CARS) spectrum is considered. In this case, the integral line-shape processing enables the determination of the excitation profile for resonance CARS (RCARS), or the ratio χR/χEL between the Raman susceptibility and the electronic susceptibility, if nonresonance CARS is performed. As an illustration, we use this procedure to evaluate χEL for a NLO polymer in solution.
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Kirov, N., Hadjichristov, G.B. Nonlinear optics in materials: integral transformation of optical four-wave mixing spectra. Journal of Materials Science: Materials in Electronics 14, 725–728 (2003). https://doi.org/10.1023/A:1026195507972
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DOI: https://doi.org/10.1023/A:1026195507972