Cubic Nonlinear Optical Effects in Conjugated Polymers

A general survey of harmonic generation techniques in polymer thin film is given and some recent results of wave dispersed third harmonic generation measurements on conjugated polymers with one dimensional π-electron delocalization are reviewed and discussed. These polymers exhibit very large cubic hyperpolarizabilities in near infrared. Some multiphoton (two and three photon) resonance enhancements in cubic susceptibility are observed. The two photon level with the same symmetry as the fundamental one lies in studied polymers below the allowed for optical transition one photon level. Possible practical applications of observed resonances are discussed.

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