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• W200098651 abstract "ABSTRACT The self-induced generation of a second harmonic light was first observed by Margulis and Osterberg 1 in an optical fiber illuminated with intense light at 1.06 μm, and later illuminated at the same time with the beam at the fundamental frequency (1.06 μm) and at 0.532 μm (second harmonic, SH), revealing a way of inducing a second-order nonlinear susceptibility χ (2) by a purely optical method in a centrosymmetric material. However, in the case of the optical fiber, the induced nonlinearities remain relatively small. The induction of noncentrosymmetry in azo-dye materials has been an object of extensive studies 2-5 because of their various potential applications in electro-optic devices and integrated optics, as they possess large second-order nonlinear properties. Side-chain polymer matrices containing organic moieties with large second-order polarizabilities s combine the possibility of inducing significant nonlinearities and the ease of processing of polymers. Structuring materials with nonlinear optical properties in a way that the nonlinearity is modulated spatially in them on a wavelength scale permits us to assure phase matching between light waves and opens up the possibility of making wave guides with frequency doubling properties. It may also lead to the development of new technologies for the production of blue coherent light sources. Organic thin films having large χ (2) nonlinearities are now extensively studied to optimize all optical poling and phase-matching conditions (optimization of the interaction length) to obtain cheap, easy-to-process and fabricate materials that will be used in tuneable optical devices providing the light at any desired wavelength. Spontaneous orientation is not a natural tendency for most molecules, and so the main difficulty lies in the realization of noncentrosymmetric structures. After a brief review of the different standard poling techniques, we present a detailed description of the optical poling technique. This technique is based on a purely optical process enabling us to take full advantage of the rich processing capabilities of optical tools. This technique offers broad possibilities for phase-matching conditions, and it enlarges the achievable poled geometries, leading to the possibility of a full control of the induced symmetry of the macroscopic second-order susceptibility χ (2) ." @default.
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• W200098651 date "2002-01-01" @default.
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• W200098651 title "All Optical Poling in Polymers and Applications" @default.
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• W200098651 doi "https://doi.org/10.1016/b978-012635490-4/50012-3" @default.
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