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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper QWJ1

Third-harmonic generation study of the dispersion of χ(3) in fused aromatic ladder polymers and their precursors

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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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