?erenkov-radiation-type second-harmonic generation in nonlinear-optical photoconducting polymers based on...

?erenkov-radiation-type second-harmonic generation was observed in a nonlinear-optical photoconducting polymer thin-film waveguide. Quasi-phase matching was self-organized by a refractive-index grating gradually formed under illumination by a guided fundamental wave. The polymer used was composed of nonlinear-optical 4(?) -nitrobenzylidene-3-acetamino-4-methoxyaniline, photosensitizing and electron-transporting 2, 4, 7-trinitro-9-fluorenone, and hole-transporting and photoconductive N -vinylcarbazole in matrix poly(methyl methacrylate).