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Two-photon absorption spectra of compounds 6–14 obtained by using 2PEF method (empty symbols) and NLT method (filled symbols). Linear absorption spectra (solid line) are shown for comparison Left vertical axes represent two-photon absorption cross-sections, right vertical axes represent extinction coefficients. Bottom horizontal axes are used for laser (two-photon excitation) wavelengths, top horizontal axes are used for linear (one-photon excitation) wavelengths.
