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. Author manuscript; available in PMC: 2018 Jun 14.
Published in final edited form as: Chem Rev. 2016 Dec 14;117(7):5070–5094. doi: 10.1021/acs.chemrev.6b00545

Figure 3.

Figure 3

Schematic of the SRS light–matter interaction. (a) Energy level diagram in the intensity representation showing the absorption of an ω1 photon and the emission of a ω2 photon. (b) Energy level diagram in the field representation showing the interaction of the fields E1 and E2 with the quantum mechanical states of the material. Note that the arrows are not time-ordered. (c) Double sided Feynman diagram of one of the SRS pathways, showing how the field interactions affect the density matrix of the material. This diagram also represents the spontaneous Raman scattering process, with ω2 a photon mode provided by the vacuum field.