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  • American Institute of Physics (AIP)  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Second harmonic generation and thermally stimulated current measurements: A study of some novel polymers for nonlinear optics (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 9157-9166 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The relaxation of electric field-induced polar orientation in novel side and main chain polymers was measured by simultaneous second harmonic generation and thermally stimulated discharge current techniques. Using this combination of experiments, individual microscopic relaxation mechanisms could be discriminated and identified. The relaxation of a polymer bearing polar chromophores on a side chain polymer was found to occur through local reorientation. For polymers containing the polar chromophore within the main chain, both a local rotation of the chromophores and the reorientation of the end-to-end vectors of the chains could be detected. Physical aging near the Tg of the polymers greatly increased the stability of the poling-induced orientation below Tg. Nonlinear dependencies on the poling field were observed for low fields and are discussed in terms of screening due to space charges. Kirkwood–Frohlich correlation factors were found to be very close to unity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459205
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Correlation between structural and optical properties in proton-exchanged LiNbO3 (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 3083-3085 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a correlation of the structural characterization of proton-exchanged LiNbO3 provided by ion beam and x-ray analysis with the optical characterization provided by refractive index and second-harmonic generation measurements. The process of proton exchange induces disorder in the crystal lattice of LiNbO3. Subsequent thermal annealing removes only partially the lattice disorder and, in particular, the near surface region of the samples generally remains highly distorted. Results of x-rays studies indicate that the proton exchange induces a strain in the lattice and thermal annealing partially recovers it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107969
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of proton exchange on the nonlinear optical properties of LiNbO3 and LiTaO3 (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2263-2265 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of proton exchange carried out using benzoic and pyrophosphoric acid on the nonlinear optical coefficient (d) of LiNbO3 and LiTaO3 was studied using a second-harmonic generation reflectance technique. Significant degradation in the d coefficient of LiNbO3 and LiTaO3 was observed as a result of proton exchange with either benzoic or pyrophosphoric acid under the conditions studied. Some recovery only in the short time proton-exchanged sample (0.5 h at 180 °C) of LiNbO3 was observed under thermal annealing at 350 °C for 1 h. Results of in situ measurement of second-harmonic signal recovery under thermal annealing are reported. Results are also presented on theoretical and experimental variations of second-harmonic generation intensity with an incident polarization angle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108259
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