5 October 1995 Novel second-order nonlinear optical polyimides
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A general approach to the synthesis of second-order nonlinear optical (NLO) polymides exhibiting high thermal stability has been developed. Several selected NLO chromophores have been incorporated into the polyimide backbone. Detailed physical studies showed that these polymers are very promising for practical applications. Three of these polyimides are soluble in common orgainc solvents, offering the ease of processing. High glass temperatures, around 230 degrees C, ensured a long term NLO stability at elevated temperatures, such as 150 degrees C. Low optical loss was observed for those soluble polymers. The synthetic approach is also versatile and will allow the syntheses of many other functional polymers.
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Dong Yu, Dong Yu, Alireza Gharavi, Alireza Gharavi, Luping Yu, Luping Yu, } "Novel second-order nonlinear optical polyimides", Proc. SPIE 2527, Nonlinear Optical Properties of Organic Materials VIII, (5 October 1995); doi: 10.1117/12.222783; https://doi.org/10.1117/12.222783

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