Nonlinear optical properties of photoconductive materials

Second- and third-order nonlinear optical responses of photoconductive materials were studied by optical second and third harmonic generation and femtosecond time-resolved spectroscopy. Four types of photoconductive molecular systems were investigated: vanadylphthalocyanine thin films, polymeric charge-transfer complex, single crystals of 9-hydroxyethylcarbazole derivatives, and carbazole head-to-tail polymers.