A new method for the direct measurement of two-photon-absorption (TPA) coefficients relative to known inverse Raman cross sections is reported. The method is independent of the laser-beam parameters utilized in the experiment. The TPA cross section of TiO₂, GaP, CdS, and SrTiO₃ due to simultaneous absorption of a photon at 14403 cm^-1 and a photon at 17248 cm^-1 was determined relative to the cross section of the 2855 cm^-1 Raman mode of liquid cyclohexane. Accurate Raman cross sections may also be measured by the proposed method.
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Lotem et al. (1977) studied this question.
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