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23 September 1994 Studies of optical nonlinearity in bis-thienyl polyenes
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We measure the magnitude and phase of the degenerate third-order nonlinear optical susceptibility (chi) (3)llll of solutions of various bis-thienyl polyenes (n-BTP) with the number n of the conjugated double bonds ranging from 3 to 9. We study both neutral and bipolaronic (i.e., doubly ionized) forms of n-BTP. We find that, within experimental error, (chi) (3)llll is proportional to nb where b-5.5 at 532 nm for our neutral n-BTP samples which have 3 <EQ n <EQ 9, and b-14 at 1.06 micrometers for the bipolaron state samples which have 6 <EQ n <EQ 9 where the probing laser wavelength is close to an absorption band. We calculate (chi) (3)llll of the bipolaronic n-BTP assuming it is associated with this absorption band acting as a two-level system and find good agreement with experiment.
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Nansheng Tang, Jouni P. Partanen, Robert W. Hellwarth, J. Laquindanum, Larry Raymond Dalton, Mingqian He, and Charles W. Spangler "Studies of optical nonlinearity in bis-thienyl polyenes", Proc. SPIE 2285, Nonlinear Optical Properties of Organic Materials VII, (23 September 1994);

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