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1 March 2010 Justification of two-level approximation for description of two-photon absorption in oxazine dyes
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Abstract
We measure and quantitatively analyze two-photon absorption (2PA) spectra and cross sections in a series of Oxazine molecules with varying chemical structures. We compare values of the permanent dipole moment difference (Δμ) obtained by three different methods: (a) 2PA cross sections using two-level approximation; (b) Stark spectroscopy, and (c) solvatochromic shifts. The first two methods give coinciding Δμ values, thus justifying two-level approximation, while solvatochromic shifts measurements yield systematically higher Δμ values. Possible reasons for such a discrepancy are discussed.
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Erich Beuerman, Nikolay S. Makarov, Mikhail Drobizhev, and Aleksander Rebane "Justification of two-level approximation for description of two-photon absorption in oxazine dyes", Proc. SPIE 7599, Organic Photonic Materials and Devices XII, 75990X (1 March 2010); https://doi.org/10.1117/12.842790
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