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  • EDP Sciences  (15)
  • American Institute of Physics (AIP)  (12)
  • Annual Reviews  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Orientational decay in poled second-order nonlinear optical guest-host polymers: Temperature dependence and effects of poling geometry (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 8471-8479 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The orientational decay of chemically and thermally stable high-temperature chromophores doped into thin films made from polyimides and a variety of other polymeric hosts has been investigated. The chromophores are aligned using electric field poling and second-harmonic generation (SHG) is used to probe the decay of the electric field poling induced alignment. The decay rate of the SHG signal from films poled using both a corona discharge and side-by-side in-plane electrodes was measured. When electrodes are chosen so that the effects of charge injection are minimized, little difference has been observed between the orientational decays from films poled using the two methods for either an amorphous preimidized polyimide host or a highly anisotropic film poled during imidization. The films imidized during poling showed significant orientational stability at 250 °C for over 15 h after a fast initial partial decay. In addition, the decay of the SHG signal was measured as a function of temperature below the glass transition in a wide variety of different polymer host systems. The temperature dependence of the decay was found to be non-Arrhenius, but could be strongly correlated with the glass transition temperature of the guest-host system using an empirical relationship similar to the Williams–Landel–Ferry or Vogel–Tamann–Fulcher equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353421
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  • 2
    Electronic Resource
    Electronic Resource
    The design, synthesis, and evaluation of chromophores for second-harmonic generation in a polymer waveguide (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 410-417 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to develop nonlinear optical chromophores for frequency doubling applications, it is important to understand the magnitudes of the relevant chromophore properties that will be required. In this paper the use of organic polymers with attached optically nonlinear chromophores to form waveguide second-harmonic-generation devices will be discussed. In particular, the use of such a frequency doubling device in optical storage applications will be considered. To this end limits on the quantity μβ are obtained where μ is the dipole moment and β the hyperpolarizability. Experimental values for electron donor/acceptor-substituted benzenes, stilbenes, and tolanes are compared to these requirements. None of the chromophores treated here have both sufficiently high optical nonlinearity and sufficiently low optical absorption at a doubled optical frequency of 400 nm to be practical in the specific application described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350724
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  • 3
    Electronic Resource
    Electronic Resource
    Rapidly tuned frequency stabilized CO2 laser (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1582-1585 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A cw CO2 laser capable of tuning through a preselected number of rotational lines is described. The use of a line-center servo lock technique allows rapid tuning and high-frequency stability to be achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138521
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  • 4
    Electronic Resource
    Electronic Resource
    Re-evaluation of the thermal stability of optically nonlinear polymeric guest-host systems (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1626-1628 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Guest-host polymer systems with potential use in electro-optic devices are discussed. The polymer host is a polyimide and the guest chromophores are 2,4,5-triarylimidazoles (lophines). Poling stabilities have been obtained by extrapolating the second harmonic generation decay using a stretched exponential function and extrapolated lifetimes greater than a year at 80 °C have been obtained. In addition, an apparent relationship between the stability of poled order and the glass transition temperature is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108497
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  • 5
    Electronic Resource
    Electronic Resource
    Electric field-dependent nonphotorefractive gratings in a nonlinear photoconducting polymer (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 712-714 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The molecularly doped polymer system polyvinylcarbazole:Lophine 1:2,4,7-trinitro-9-fluorenone, which is both photoconductive and optically nonlinear, forms a grating whose diffraction efficiency is strongly dependent on the externally applied electric field. Two-beam coupling measurements show no energy transfer between the beams and grating translation measurements and reveal an index of refraction grating that is not phase shifted relative to the light intensity pattern at any value of the externally applied field. These results lead to the conclusion that, even though diffraction is field dependent, the grating is not photorefractive in origin. This illustrates the importance of two-beam coupling measurements for characterization of potentially photorefractive polymers. A possible origin of the nonphotorefractive grating based on quadratic electroabsorption is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111043
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  • 6
    Electronic Resource
    Electronic Resource
    C60 sensitization of a photorefractive polymer (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2967-2969 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fullerene molecule C60 is shown to act as a useful sensitizer of a recently discovered photorefractive polymer. Measurements of the steady-state diffraction efficiency, grating growth rate, and other photorefractive properties are presented as a function of C60 concentration, writing intensity, and applied electric field. The dc photoconductivity, grating growth rate, and steady-state diffraction efficiency all increase by as much as a factor of 20 upon doping with up to 0.2 wt % C60. The sensitization appears to result from a small increase in the carrier generation efficiency and a larger increase in the useful optical absorption at the operating wavelength, 647 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108033
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  • 7
    Electronic Resource
    Electronic Resource
    The production of (3/2) ω0 light by the two-plasmon decay instability (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1454-1459 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the emission of (3/2) ω0 light from CO2 laser plasma interactions are described. The target was an underdense preformed plasma with a relatively long density scalelength. Comparisons are made between the (3/2) ω0 emission and the spectrum of plasma waves driven by the two-plasmon decay instability as measured by Thomson scattering techniques. The spectrum of (3/2) ω0 light is shown as a function of scattering angle and compared with the relevant theories. Strong modulation of the spectrum was seen and is ascribed to the production of short-wavelength ion waves by the plasma waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.864980
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  • 8
    Electronic Resource
    Electronic Resource
    An rf excited circular waveguide CO2 laser (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2309-2313 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Designs for sealed-off, air-cooled rf excited waveguide lasers with a circular bore are discussed. The devices are straightforward to manufacture and show good performance with respect to lifetime, efficiency, and mode purity. The design can be easily adopted to accommodate PZT and grating tuning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141355
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  • 9
    Electronic Resource
    Electronic Resource
    Suicide Substrates, Mechanism-Based Enzyme Inactivators: Recent Developments (1984)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 53 (1984), S. 493-535 
    Details
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.bi.53.070184.002425
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  • 10
    Electronic Resource
    Electronic Resource
    Chemical Approaches to the Study of Enzymes Catalyzing Redox Transformations (1978)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 47 (1978), S. 881-931 
    Details
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.bi.47.070178.004313
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