Abstract
Aromatic ladder polymere are a relatively new class of highly conjugated organic materials that show large third-order optical nonlinearities χ(3).1 These fused aromatic ring systems are unique because there are no single bonds about which rotation can occur to reduce π-orbital overlap and, hence, limit tire nonlinearity. We have examined the effects of conjugation and rotation about single bonds in a representative progression of these materials by measuring the χ(3) from third-harmonic generation (THG) as a function of wavelength over 1-2.4 µm, starting from the monomer cis-BB and proceeding through the singly bonded polymer BBC to the fully fused polymer BBL (see Fig. 1). DHTAP was included as a precursor model molecule to cis-BB.
© 1991 Optical Society of America
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