Two-photon tensor projections
We depend on other sources (Sakurai, Bunker, McClain and Harris) for the derivation of the two-photon operator, which applies to both two-photon absorption (TPA; two in, none out) and Raman and Rayleigh scattering (RRS; one in, one out). In this chapter we show how the two-photon operator poses a symmetry problem, and how the tools we have developed can be used to solve it.
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