Abstract
Extending the novel method of preparing highly stable second-order nonlinear optical materials via thermally induced chemical crosslinking under electric field,1,2 we report the synthesis and characterization of a novel copolymer consisting of donor and acceptor substituted di-azogroups and glycidylmeth-acrylate (Mn = 22000, Mw = 48000). Due to the π-conjugation elongation, these NLO-moieties employ high µβ-values compared to their two-ring analogs. In contrast to the materials discussed in Refs. 1 and 2, this linear polymer can be solved and processed without any necessity of precrosslinking before poling. Films of a few microns thickness have been prepared by spin coating from a 20% solution in 1, 4-dioxan. The linear optical properties of the films were investigated by total internal reflection and absorption spectroscopy techniques. In situ corona poling and second-harmonic generation studies were performed on the samples using a fundamental wavelength of 1064 nm. The polar order was frozen by thermally induced crosslinking of the glycidyl groups. Measurement at elevated temperatures of 80°C showed no poling relaxation in the NLO signal.
© 1991 Optical Society of America
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