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  • 1
    Electronic Resource
    Electronic Resource
    Mach–Zehnder interferometer measurement of the Pockels effect in a poled polymer film with a coplanar electrode structure (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3788-3790 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mach–Zehnder interferometry was used to measure the Pockels effect in a poled electro-optic polymer thin film with a coplanar electrode structure. The beam at the sample arm of the Mach–Zehnder interferometer passed through a polymer thin film which had been spin-coated on top of a clear gap between two electrodes patterned on an optical substrate. This unique optical geometry enabled the Pockels coefficients of the poled electro-optic polymer film in the directions of the ordinary and the extraordinary optic axes to be determined independently. As an example, the tensor ratio r33/r13 for a stilbene-dye-doped polyimide guest/host polymer film was determined experimentally; the ratio turned out to be 4.6, which was higher than the value of 3 predicted by the thermodynamic model. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116999
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of a Mach-Zehnder interferometry measurement of the Pockels coefficients in a poled polymer film with a reflection configuration (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 1848-1853 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mach-Zehnder interferometry is employed to measure the Pockels coefficients in a poled thin polymer film, which serves as a reflection mirror in the sample arm of the interferometer. As a complete optical characterization of the electro-optic polymer film, the modulated light intensity of the Mach-Zehnder interferometer is investigated as a function of the optical bias in the reference arm, the modulation voltage applied to the film, the polarization angle of the incident light, and the angle of incidence on the film. The Mach-Zehnder interferometry measurement of the Pockels coefficients in the reflection configuration has an advantage over single-beam polarization interferometry in permitting the independent determination of the Pockels tensor components, r13 and r33. Particularly, in a reflection configuration two-beam interferometric measurement, a proper consideration of the optical path change due to the refractive angle change is found to be critical in determining the absolute values of the Pockels coefficients. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366908
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  • 3
    Electronic Resource
    Electronic Resource
    Response of the F-region Ionosphere to a Solar Eclipse (1970)
    [s.l.] : Nature Publishing Group
    Nature 226 (1970), S. 1121-1123 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MEASUREMENTS of Faraday rotation of a linearly polarized signal have been used widely as a means of obtaining the integrated electron density or electron content in the ionosphere. Early measurements used the Moon as a reflector of radar signals and hence provided data only when the Moon was above ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2261121a0
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  • 4
    Electronic Resource
    Electronic Resource
    1.3 μm planar buried heterostructure distributed feedback lasers grown by four-step MOVPE (1995)
    Springer
    Optical and quantum electronics 27 (1995), S. 459-464 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Data are presented on InGaAsP/InP planar buried heterostructure (PBH) distributed feedback (DFB) lasers operating at 1.3 μm. A four-step MOVPE process and holographic lithography are employed to fabricate these lasers. The CW laser threshold and the slope efficiency from these lasers are 9 mA and 0.23 mW mA-1 per facet at room temperature. Single-longitudinal-mode operation with side-mode suppression of more than 35 dB is obtained at 5 mW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00563584
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of a stratus cloud on the redistribution and transformation of pollutants (1986)
    Springer
    Water, air & soil pollution 30 (1986), S. 195-203 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A schematic bidimensional model has been developed to describe an extended stratus formed by warm, moist air in a frontal system. Parcel trajectories are followed through the cloud, and the formation of precipitation is considered on the basis of simple assumptions. To the dynamic description, a chemical module has been coupled, which includes the oxidation of SO2 in aqueous-phase (by H2O2, O2 and radicals scavenged from interstitial air) and that of NO and NO2 in gaseous phase with subsequent dissolution of HNO2 and HNO3. The pH of precipitation is calculated. Sensitivity tests have been run to study the influence of various dynamic, microphysical and chemical parameters, such as cloud base temperature, cloud thickness, vertical velocities, initiation temperature and distribution of precipitation in the cloud, and the initial concentrations of different chemical species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305189
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  • 6
    Electronic Resource
    Electronic Resource
    The distribution of pollutants near a frontal surface: A comparison between field experiment and modeling (1986)
    Springer
    Water, air & soil pollution 30 (1986), S. 171-177 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A number of frontal systems passed through the experimental area during the 1984 North Bay Acid Snow Study. Two different cold frontal systems were examined using aircraft instrumented for cloud and air chemistry, and cloud microphysics measurements. A distinct maximum in aerosol particle number concentration was detected near both frontal surfaces. In at least one case, a peak in NOx concentrations was observed simultaneously with the aerosol particle maximum. Using a model of frontogenesis, the aerosol particle layer can be explained in terms of air circulations associated with a front. The model also demonstrates how better flight plans might be designed for air chemistry studies using aircraft.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305186
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    Paper (German National Licenses)
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