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Phase-matched second-harmonic generation (SHG) in azodye-doped polymethylmethacrylate films was demonstrated using the nonresonant optical poling technique. During the seeding process, samples were irradiated simultaneously by coherent superposition of the fundamental and the second-harmonic light of a femtosecond laser. Optical poling experiments were performed at three wavelengths of 1500, 1320, and 1300 nm, respectively. The quadratic dependence of SHG on the film thickness showed that a χ[sup (2)] grating that satisfied the phase-matching condition for SHG was optically induced in the polymer films. The SHG conversion efficiency of a 105 μm thick film was estimated to be about 2%. A relaxation retardation effect of the photoinduced χ[sup (2)] was also observed in the thick films. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Provides information on a study which used two kinds of polymers in a thermal-assisted optical poling to improve the photostability of the optically induced polar orientation of molecules. Description of the experiments; Results and discussion; Conclusion.

Investigates the origin of optically-encoded second-harmonic generation in germanosilicate glass via a band-to-band excitation. Measurement of absorption spectra before and after separation; Relation of enhancement effect to the creation of an electron trapped center; Repetition rate of laser pulses.

Reports that DR1(4-[N-ethyl-N-(2-hydroxyethyl)]amino-4'-nitro-azobenzene)-doped poly(methyl methacrylate) and DR1-doped silica gel thin films were optically polarized. Use of coherent superposition of the fundamental and second-harmonic light of a pulse laser.