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  • 1
    Electronic Resource
    Electronic Resource
    Multiple spin echo formation (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6231-6231 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Multiple spin echo formation for quadrupole nuclei (I(approximately-greater-than)1/2) in magnetics having inhomogeneous hyperfine and quadrupole interactions was investigated using two and three pulses technique. It was shown that the "forbidden'' echo appearance is possible for the time intervals comparable with the characteristic times of the quardupole and hyperfine broadening. The amplitude drop when the time interval between exciting pulses increases is determined not by relaxation time (as usual) but by inhomogeneity having the larger characteristic time (HFI or quadrupole). Multiple spin echo signal for the two pulses technique is due to the transitions with quantum numbers m2(approximately-greater-than)m1.1 However, when three pulses technique with "unusual'' exciting pulses sequence (τ12(approximately-greater-than)τ23) is used transitions with m1〈m2 take part in generation of some additional echo signals. This is confirmed by amplitude and time dependences for the echo signals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348817
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  • 2
    Electronic Resource
    Electronic Resource
    Impact of deformation potential scattering on free-carrier induced optical nonlinearities: An experimental study in GaAs (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 3992-3999 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present results of the experimental determination of the optical nonlinearities induced by heating free electrons distributed in the multivalley conduction band of highly doped n-GaAs. We propose a very sensitive multilayer leaky waveguide structure for transverse magnetic polarized waves in order to drastically reduce the required optical intensities. We explain in depth the dependence of the optical nonlinearity on doping concentration and deformation potentials. For a doping concentration no of 7.6×1018 cm−3, we found a nonlinear refractive index value n2(approximate)(1(minus-plus)0.2)×10−6 cm2/W at λ=10.6 μm, by fitting nonlinear reflection measurements with an equivalent intervalley deformation potential value ΛLL=(1.0±0.30)×109 eV/cm. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1448881
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental characterization of reactive ion etched germanium diffraction gratings at 10.6 μm (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3453-3455 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental study of diffraction gratings reactive ion etched in germanium is performed. Gratings are designed for the 10.6 μm infrared CO2 laser. Different etchants have been compared to pattern 3-μm-deep grooves in the germanium layers evaporated on a GaAs substrate. The experimental diffraction efficiency (maximum 30%) of the prototype gratings are in good accordance with the theoretical predictions. The U-shaped grooves have still to be further optimized. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117249
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