16 December 1993 Resonant third-order optical nonlinearity of the neutral and the dication molecules of a triphenodithiazine model compound
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Abstract
Third order nonlinear optical susceptibility of solutions of a triphenodithiazine derivative in dichloromethane has been measured at several different wavelengths utilizing sub-picosecond degenerate four-wave mixing. The values of the second hyperpolarizability, (gamma) , for the neutral and for the oxidized form (dication) are reported. The measurements performed at the wavelengths corresponding to the absorption maxima of the neutral and the dication forms (578 nm and 800 nm, respectively) indicate a twofold increase of the (gamma) /(sigma) figure of merit (where (sigma) is the absorption cross section) for the dication molecule. Time resolved experiments reveal different dynamics of photoexcitation relaxation in the neutral and the oxidized molecules.
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Jacek Swiatkiewicz, Jacek Swiatkiewicz, Maciek E. Orczyk, Maciek E. Orczyk, Paras N. Prasad, Paras N. Prasad, Charles W. Spangler, Charles W. Spangler, Mingqian He, Mingqian He, } "Resonant third-order optical nonlinearity of the neutral and the dication molecules of a triphenodithiazine model compound", Proc. SPIE 2025, Nonlinear Optical Properties of Organic Materials VI, (16 December 1993); doi: 10.1117/12.165277; https://doi.org/10.1117/12.165277
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