29 November 2000 Material glass transition temperature, device thickness, and operational temperature effects on absorption of electro-optic polymer films
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Abstract
In chromophore doped materials, the trade-off between nonlinear coefficients and absorption is a critical issue. In particular, X(2):X(2) cascading based applications at 1.55 micrometers impose stringent conditions on the absorption at the second-harmonic wavelength. Transmission spectroscopy through a thin film does not provide sufficient resolution to measure the absorption coefficient on the red side of the main absorption band. However, assuming Voigt profiles, it is possible to extrapolate the absorption coefficient in the near infrared (NIR) from the main electronic resonance. We report on the dramatic impact of the host polymer matrix on the near infrared absorption of azobenzene chromophores. The effect is directly correlated to the host polymer glass transition temperature. The case of hybrid sol-gel material is also discussed. In particular, we present here an interesting correlation between the poling temperature and some spectroscopic properties. This correlation and thermo- spectroscopic measurements lead us to define an effective Tg in the sol-gel system. We also report on film thickness dependent absorption properties.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anne-Claire Le Duff, Anne-Claire Le Duff, Michael Canva, Michael Canva, Yves Levy, Yves Levy, Alain Brun, Alain Brun, A. Galvan-Gonzalez, A. Galvan-Gonzalez, Tomas Pliska, Tomas Pliska, George I. Stegeman, George I. Stegeman, Robert J. Twieg, Robert J. Twieg, P. Chan, P. Chan, Khalid Lahlil, Khalid Lahlil, Frederic Chaput, Frederic Chaput, Jean-Pierre Boilot, Jean-Pierre Boilot, } "Material glass transition temperature, device thickness, and operational temperature effects on absorption of electro-optic polymer films", Proc. SPIE 4106, Linear, Nonlinear, and Power-Limiting Organics, (29 November 2000); doi: 10.1117/12.408498; https://doi.org/10.1117/12.408498
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