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Proceedings Paper

Wavelength dependent photoinduced depoling in poled nonlinear optical polymer thin films
Author(s): Yongqiang Shi; David J. Olson; James H. Bechtel; Srinath Kalluri; Sean M. Garner; William H. Steier
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Paper Abstract

Photoinduced depoling in a crosslinked side-chain polyurethane-disperse red 19 thin film is investigated. Using an electro-optic grating modulator, we have investigated the electro-optic coefficients and depoling rates of the poled polymer films as a function of incident fluence at different wavelengths from 543 to 795 nm. Our experiments showed that when the incident wavelength approaches the absorption peak of the nonlinear optical chromophore attached to polymer backbone, the depoling effect becomes more and more severe. The photoinduced relaxation rate increased approximately 5 orders in magnitude from 670 nm to 543 nm. The photoinduced depoling was observed even at wavelengths 200 nm away from the peak absorption wavelength of the chromophore. A polarization microscope showed that chromophores were randomized and rotated by the excitation laser beams after exposure. However, no significant photoinduced depoling was detected during the time span of the measurement of 795 nm near infrared wavelength which is approxiamtely 320 nm away from the absorption peak.

Paper Details

Date Published: 5 October 1995
PDF: 9 pages
Proc. SPIE 2527, Nonlinear Optical Properties of Organic Materials VIII, (5 October 1995); doi: 10.1117/12.222790
Show Author Affiliations
Yongqiang Shi, TACAN Corp. (United States)
David J. Olson, TACAN Corp. (United States)
James H. Bechtel, TACAN Corp. (United States)
Srinath Kalluri, Univ. of Southern California (United States)
Sean M. Garner, Univ. of Southern California (United States)
William H. Steier, Univ. of Southern California (United States)

Published in SPIE Proceedings Vol. 2527:
Nonlinear Optical Properties of Organic Materials VIII
Gustaaf R. Moehlmann, Editor(s)

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