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  • 1
    Electronic Resource
    Electronic Resource
    Ion-exchanged Fe doped KTiOPO4 optical waveguides (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3118-3120 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Planar and channel waveguides were fabricated in Fe doped KTiOPO4 (KTP) using the Rb+:K+ ion-exchange process. These waveguides were characterized optically. It was found that the index change is smaller than that obtained using undoped KTP substrates. However, the diffusion depth is larger. The Fe ions appear to be an effective means to modify the properties of ion-exchanged KTP waveguides. The photorefractive effect (PRE) in Fe doped KTP channel waveguides was also investigated at wavelengths of 0.543, 0.6328, and 0.83 μm. PRE was not observed, indicating that unlike that in LiNbO3 or KNbO3, Fe ion is not a major contributing factor in KTP. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363123
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  • 2
    Electronic Resource
    Electronic Resource
    Finite-element stress analysis of failure mechanisms in a multilevel metallization structure (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 3037-3041 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A finite-element method taking into account material nonlinearity was used to calculate the stress distribution in interconnecting lines and studs of a three-dimensional multilevel metallization structure in a microelectronic device. A good correlation was obtained between the location of calculated stress concentration centers and the experimentally observed void sites in the stud. Accordingly, the failure mechanisms of the stress-induced voiding in the stud and the crack formation in the underlying substrate were inferred to be associated with different stress components. Furthermore, the stress concentration centers were found to migrate as the temperature changes, which agrees with the experimental observations. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358653
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  • 3
    Electronic Resource
    Electronic Resource
    Erratum: "Epitaxial growth of RbTiOPO4 films on KTiOPO4 substrates by excimer laser ablation technique'' [J. Appl. Phys. 76, 8215 (1994)] (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5487-5487 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359608
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  • 4
    Electronic Resource
    Electronic Resource
    Growth and photorefractive properties of Mn-doped (KNa)0.1(Sr0.6Ba0.4)0.9Nb2O6 crystals (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8835-8837 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: (KNa)0.1(Sr0.6Ba0.4)0.9Nb2O6, or KNSBN, crystals have been grown with two different Mn concentrations: 0.02 wt % and 0.04 wt %. Two-wave mixing and self-pumped phase conjugation experiments were carried out on these crystals at 632.8 nm wavelength. The measured two-wave coupling gains for the 0.02 wt % and 0.04 wt % crystals are larger than 7 cm−1 and 9 cm−1, respectively, and the two-wave coupling time response is faster for the 0.4 wt % crystal. In addition, the self-pumped phase conjugation reflectivity of the 0.04 wt % crystal is measured to be as high as 70%. It is shown that the Mn dopant can increase effectively the absorption coefficient and enhance the photorefractive properties of KNSBN. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362561
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  • 5
    Electronic Resource
    Electronic Resource
    Properties of ion exchanged planar and channel optical waveguides fabricated in Cu doped KTiOPO4 substrates (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2737-2739 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Planar and channel optical waveguides were fabricated in Cu doped KTiOPO4 (KTP) substrates using Rb+:K+ ion exchange process and annealing process. The effective refractive indices were measured using the m-line method and the refractive index profiles of these waveguides were calculated using the inverse WKB method. For waveguides in Cu:KTP substrates the difference of diffusion depth d and index change Δn at the z− and z+ surfaces can hardly be observed. This observation is different from KTP. Compared with undoped KTP substrates the diffusion depth d at the z− surfaces is larger, whereas the index change Δn is smaller. At the z+ surfaces both d and Δn are larger. The light induced effective index changes in Cu doped KTP channel waveguides were measured at 0.476, 0.488, 0.514, 0.6328, and 0.83 μm wavelengths. No changes were observed at the power flow of 1×108 W/m2, revealing that Cu ion does not play an important role in photorefractive effect of KTP crystals. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120122
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  • 6
    Electronic Resource
    Electronic Resource
    Theoretical analysis of optimal quasi-phase matched second harmonic generation waveguide structure in LiTaO3 substrates (1999)
    Springer
    Optical and quantum electronics 31 (1999), S. 337-349 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Based on the QPM structure and the coupled-mode theory, the maximum SHG conversion efficiency of QPM-SHG waveguides in LiTaO3 substrates is analyzed by optimizing the mode confinement and the mode overlap factors. For TM00(ω)-to-TM00(2ω) conversion with a non-square shaped domain inversion QPM structure, the mode confinement and mode overlap factor are dependent not only on the optical field distribution for the fundamental and the SH waves in the waveguide, but also on the domain inversion shape. With the assumption that the refractive index profile of an annealed, proton exchanged LiTaO3 channel waveguide is an exponential decay function in the depth direction, and a Gaussian function in the width direction, the analytical expression of the optical field distribution for the lowest order mode can be obtained. By considering both a non-Gaussian field distribution and a non-square shaped domain inversion structure, the theoretical values for achieving the optimal QPM-SHG waveguide structure are determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006988507435
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  • 7
    Electronic Resource
    Electronic Resource
    Plasticity and superplasticity of advanced materials (1995)
    Springer
    Advanced performance materials 2 (1995), S. 203-216 
    Details
    ISSN: 1572-8765
    Keywords: superplasticity ; P/M superalloy ; Al−Li alloy ; metal matrix composites ; intermetallic compound ; ceramics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, some of the recent research progress on advanced materials supported by National Advanced Materials Committee of China are reviewed. The basic characteristics of plasticity and superplasticity, such as stress-strain curves, strain rate,m-value etc. are discussed. The P/M superalloy, ceramics, aluminumlithium alloys, metal matrix composites, intermetallic compounds, magnetic alloys and high transition temperature superconductive materials have been selected as advanced materials for plasticity and superplasticity study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00705444
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  • 8
    Electronic Resource
    Electronic Resource
    Origin and manifestation of the anharmonic potential felt by an ion-cloud in an actual Paul trap (1996)
    Springer
    Applied physics 62 (1996), S. 421-426 
    Details
    ISSN: 1432-0649
    Keywords: 29.25 ; 32.80.Pj ; 35.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The anharmonic potential felt by a single-species ions confined in a rf quadrupole trap which results from a non-ideal trap configuration and the charge distribution of the ion cloud is studied. The rf resonance-absorption spectra are explained by a Duffing oscillator and a representation of the line-shape parameter η is derived. Forη 〉 0.77, the electric signals will exhibit hysteresis. The relation with the anharmonic potential is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081205
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  • 9
    Electronic Resource
    Electronic Resource
    Grain Size Effect in High Temperature Creep and Superplastic Deformation of Polycrystalline Matrials (1995)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 189-190 (July 1995), p. 335-340 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.189-190.335.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Reducing discrepancies in atmospheric heat budget of Tibetan Plateau by satellite-based estimates of radiative cooling and cloud-radiation feedback (1995)
    Springer
    Meteorology and atmospheric physics 56 (1995), S. 229-260 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary Past investigations of the summertime heat budget over the Tibetan Plateau have not included detailed estimates of radiative cooling (Q R ) nor have they carefully considered the effects of cloudiness on this term. The various attempts to eyaluate different combinations of heat and moisture budget torms and to understand the sources of energy to the summer armospheric heat source over the plateau are not in agreement, partly because of remaining discrepancies in the radiative and turbulent flux components, and partly because until recently, the conventional data sets needed for independently estimating the total heating and moistening terms have been incomplete. The uncertainties in the radiative term have also led to difficulties in assessing the uncertainties in the other budget terms, since no study to date has assembled a complete enough data set to allow a unified calculation of all budget quantities or to obtain budget closure. Recently published results of Yanai and his colleagues involving apparent heat source calculations for the plateau region based on a much improved FGGE data set, have motivated the examination of whether more detailed radiative calculations can help resolve past discrepancies in the budget terms on a monthly time scale. This study uses a continuous time series of 22-km resolution INSAT geosynchronous satellite measurements and ECMWF profile analyses in conjunction with medium spectral resolution radiative transfer models to estimate the slicrtwave and longwave components of the radiative cooling term and the role of cloudiness on these components for the 1988 summer period. The calculations reveal both meridional and zonal structure in radiative divergence across the plateau associated with the substantial gradients of cloudiness and aridity that dominate the summertime plateau climatology. The calculations also indicate that the magnitudes of both cloud-induced shortwave heating and longwave cooling over the plateau are much greater than over low-elevation regions. Moreover, since cloud-induced longwave cooling exceeds cloud-induced shortwave heating, the bulk effect of clouds is to radiatively cool the plateau atmosphere. The high resolution calculations are reduced to monthly averaged budget quantities for analyzing whether existing discrepancies in the plateau heat budget can be resolved. Although there is no means to rigorously verify the accuracies and representativeness of the individual budget terms, the new radiative estimates combined with the most reliable current estimates of total heating and turbulent fluxes, produce near closure (within 4%) of the plateau heat budget for the June to August period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01030139
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