Sylvia H. Stevenson scite author profile

Two-photon excitation (TPE) and second harmonic generation (SHG) data associated with the 31475-cm-I a-exciton of high-purity strain-free mounted sublimation crystals of naphthalene are reported. The marked temperature dependence of the TPE/SHG branching ratio for several phase-matching conditions is in accord with the polariton model. The branching ratio depends critically on the scattering of the polariton (formed by polariton fusion) with phonons. By analogy with one-photon absorption, two-photon absorption is shown to be a four-body process (two "visible" polaritons, the exciton and phonon).

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Sylvia H. Stevenson

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New organic non-linear optical materials of stilbene and diphenylacetylene derivatives

Temperature-dependent polariton behavior of two-photon absorption and second harmonic generation in naphthalene. The perfect crystal regime

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