Abstract
There has been considerable interest in developing processable, thermally stable second-order nonlinear optical thin films by using the poled-polymer method. Approaches that use thermoplastic guest-host polymers or copolymers have demonstrated linear electro-optic coefficients higher than that of lithium niobate. However, these polymers generally have low-glass transition temperatures, so that the poled polymers suffer from the thermal re-orientation of chromophores within the polymer host. This has strongly limited the operating and processing temperatures of these polymers for practical applications. In recent years polyimides have been suggested as the host for nonlinear chromophores because of their very high glass transition temperatures and their compatibility with semiconductor processing technologies.
© 1993 Optical Society of America
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