SEARCH Articles Figures Tables Absolute Two-Photon Absorption Cross Sections and Spectra Applications of Two-photon Absorption Cooperative two-photon absorption Doppler-Free Two-Photon Absorption Early Studies of Two-Photon Absorption in Organic Molecules Free two-photon absorption One- and Two-Photon Absorption Spectra Photon absorption Resonance enhancement two-photon absorption The Two-Photon Absorption Process Two-Photon Absorption Measurements Two-Photon Absorption and Fluorescence Two-photon Absorption of Lanthanide Complexes from Fundamental Aspects to Biphotonic Imaging Applications Two-photon absorption chromophores Two-photon absorption coefficients Two-photon absorption cross-section Two-photon absorption polymers Two-photon absorption spectrum Two-photon absorption tensor Two-photon absorption, TPA Two-photon absorptive processes Two-photon and multiphoton absorption