Fabrication of Surface Relief Grating with Second-Order Nonlinearity Using Urethane-Urea Copolymer Films
- 1 November 1999
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 38 (11R)
- https://doi.org/10.1143/jjap.38.6316
Abstract
Surface relief gratings on azobenzene-substituted urethane-urea copolymer films with large second-order nonlinearity are fabricated by a laser-interferometric method. The surface relief structures are obtained upon exposure to an interference pattern of a polarized Ar+ laser beam, which mainly results from photoablation. The gratings are thermally stable at temperatures higher than glass transition temperature (T g) of the copolymer. The surface relief gratings with second-order nonlinearity are fabricated after a corona poling process. We report what we believe to be the first experimental observation of the separated second-harmonic generation from the fundamental wave by the surface relief grating with second-order nonlinearity.Keywords
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