Wavelength dependent photoinduced depoling in poled nonlinear optical polymer thin films

Yongqiang Shi; David J. Olson; James H. Bechtel; Srinath Kalluri; Sean M. Garner; William H. Steier

doi:10.1117/12.222790

5 October 1995 Wavelength dependent photoinduced depoling in poled nonlinear optical polymer thin films

Yongqiang Shi, David J. Olson, James H. Bechtel, Srinath Kalluri, Sean M. Garner, William H. Steier

Proceedings Volume 2527, Nonlinear Optical Properties of Organic Materials VIII; (1995) https://doi.org/10.1117/12.222790
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

Yongqiang Shi, David J. Olson, James H. Bechtel, Srinath Kalluri, Sean M. Garner, and William H. Steier "Wavelength dependent photoinduced depoling in poled nonlinear optical polymer thin films", Proc. SPIE 2527, Nonlinear Optical Properties of Organic Materials VIII, (5 October 1995); https://doi.org/10.1117/12.222790

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KEYWORDS

Polymers

Absorption

Polymer thin films

Chromophores

Polarization

Modulators

Electro optics

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