1 August 2003 Photoinduced microstructures inside bulk azodye-doped polymers by the coherent field of a femtosecond laser
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Proceedings Volume 4948, 25th International Congress on High-Speed Photography and Photonics; (2003); doi: 10.1117/12.516961
Event: 25th international Congress on High-Speed photography and Photonics, 2002, Beaune, France
Abstract
Two kinds of photoinduced periodic microstructures in azodye-doped polymethylmethacrylate were fabricated by interference of two coherent beams of a nonresonant femtosecond laser. One is volume holographic gratings induced by interference of two fs-laser beams with same frequency; the other is molecular polar orientation induced by dual-frequency coherent fs-laser excitation at fundamental and second harmonic frequencies. The photoinduced holographic gratings consist of two surface relief gratings and refractive index modulated gratings in the interior of the polymers. Diffraction efficiency up to 90% of the first-order Bragg for the gratings was obtained. For the photoinduced molecular polar orientation, three kinds of noncentrosymmetries of the polymer films were optically tailored using appropriate combinations of the writing beam polarizations.
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Jinhai Si, Jianrong Qiu, Kazuyuki Hirao, "Photoinduced microstructures inside bulk azodye-doped polymers by the coherent field of a femtosecond laser", Proc. SPIE 4948, 25th International Congress on High-Speed Photography and Photonics, (1 August 2003); doi: 10.1117/12.516961; https://doi.org/10.1117/12.516961
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KEYWORDS
Diffraction gratings

Diffraction

Polymers

Polarization

Second-harmonic generation

Holography

Molecules

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