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  • 42.65.−k  (1)
  • 82.40-m  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Photoassisted poling of azo dye doped polymeric films at room temperature (1992)
    Springer
    Applied physics 54 (1992), S. 486-489 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.40-m ; 78.65Hc ; 42.79Gn
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The reversible cis-trans photoisomerization of disperse red 1 (DR1) in PMMA thin films has been demonstrated to be strongly polarization sensitive [1]. In this communication two mechanisms are identified: the angular hole burning and the angular redistribution of molecules. It is shown that, in the presence of a DC electric field, the redistribution is not centrosymmetric and produces a poling of the film. The evolution of the second-order nonlinear susceptibility, χ(2), is monitored by measuring the electro-optic effect by attenuated total reflection and by second-harmonic generation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00325395
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Femtosecond Kerr ellipsometry in polydiacetylene solutions: Two-photon effects (1993)
    Springer
    Applied physics 56 (1993), S. 29-34 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.65.−k ; 42.65.Re ; 78.65.−s
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We describe a pump-probe femtosecond Kerr experiment in polydiacetylene solutions (4BCMU, yellow form). The Kerr ellipsometry technique permits a separate determination of the real and of the imaginary part of anisotropic index changes. The wavelength (620 nm) of the pump pulses lies in the transparency region of polydiacetylene while the probe pulses have a broad white spectrum. The largest contribution to the Kerr signal is a quasi-resonant stimulated anti-Stokes Raman absorption. A flat two-photon transition spectrum with β≈4×10−3 cm/MW is observed close to 4 eV. The two-photon excited states have a life time close to 12 ps and they present a broad absorption band in the 2 eV range.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351899
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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