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Proceedings Paper

Studies of optical nonlinearity in bis-thienyl polyenes
Author(s): Nansheng Tang; Jouni P. Partanen; Robert W. Hellwarth; J. Laquindanum; Larry Raymond Dalton; Mingqian He; Charles W. Spangler
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Paper Abstract

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.

Paper Details

Date Published: 23 September 1994
PDF: 10 pages
Proc. SPIE 2285, Nonlinear Optical Properties of Organic Materials VII, (23 September 1994); doi: 10.1117/12.187514
Show Author Affiliations
Nansheng Tang, Univ. of Southern California (United States)
Jouni P. Partanen, Univ. of Southern California (United States)
Robert W. Hellwarth, Univ. of Southern California (United States)
J. Laquindanum, Univ. of Southern California (United States)
Larry Raymond Dalton, Univ. of Southern California (United States)
Mingqian He, Northern Illinois Univ. (United States)
Charles W. Spangler, Northern Illinois Univ. (United States)


Published in SPIE Proceedings Vol. 2285:
Nonlinear Optical Properties of Organic Materials VII
Gustaaf R. Moehlmann, Editor(s)

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