Studies of optical nonlinearity in bis-thienyl polyenes

Nansheng Tang; Jouni P. Partanen; Robert W. Hellwarth; J. Laquindanum; Larry Raymond Dalton; Mingqian He; Charles W. Spangler

doi:10.1117/12.187514

23 September 1994 Studies of optical nonlinearity in bis-thienyl polyenes

Nansheng Tang, Jouni P. Partanen, Robert W. Hellwarth, J. Laquindanum, Larry Raymond Dalton, Mingqian He, Charles W. Spangler

Author Affiliations +

Proceedings Volume 2285, Nonlinear Optical Properties of Organic Materials VII; (1994) https://doi.org/10.1117/12.187514
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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 n^b 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.

Citation Download Citation

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); https://doi.org/10.1117/12.187514

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