Abstract:
A theory is presented of the active speetroscopy using steady-state spontaneous Raman scattering by polaritons, i.e., spontaneous Raman scattering of a "test" wave ωπ by polaritons generated in an independent process of polariton stimulated Raman scattering of a given high-power pump wave ω1 with a possible additional illumination at the frequencies of polariton ωπ and/or Stokes ωs =ωπ–ωp waves. A fluctuation-dissipation method is used to find the intensities of the scattered waves at frequencies ωa,σ = ωπ ±ωp. The cases of weak and strong absorption at a frequency ωp are considered and various regimes are discussed. A detailed analysis is made of the interference of three- and four-photon mechanisms of the formation of scattered waves. The possibility of the active speetroscopy based on the spontaneous Raman scattering by polaritons in certain spectroscopic measurements is discussed.
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