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  • 1985-1989  (6)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Double waveguide in LiNbO3 by ion implantation (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1710-1712 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ion implantation has been employed to produce superposed planar waveguide structures in LiNbO3. This was achieved by constructing two optical barriers at different depths beneath the crystal surface using 1.1 and 2.2 MeV He+. The composite refractive index profile was compared with those of the two individual barriers, by means of a dark mode analysis technique based on a calculation of the reflectivity function at the coupling prism. The profiles were found to be directly additive except for a noticeable annealing effect of the first implanted barrier, and a range enhancement of the second barrier. These effects were confirmed by varying the order and temperature of the implantations. The implications of these results to possible device construction have been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102316
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ion-implanted planar waveguides in barium sodium niobate (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 544-546 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Planar optical waveguides have been formed in Y-cut barium sodium niobate by He+ ion implantation.Refractive index profiles have been determined for n0 and ne using our dark-mode-spacing reflectivity calculation at 0.633 and 0.488 μm. The profiles are similar to those reported for LiNbO3 with optical barriers having −Δn∼5.5% for n0 and ∼3.5% for ne (at a dose of 3×1016 cm−2), and with an anomalous index increase in the guiding region for ne. The sharp modes suggest losses of a few dB/cm, and guide stability up to 500 °C has been determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100629
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    "Missing modes'' in ion-implanted LiNbO3 waveguides (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1287-1289 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated that in optical waveguides formed by ion implantation in LiNbO3, the lower modes for the extraordinary index exist in a buried region of enhanced index, and so may be unable to couple with a surface prism. This is because a shallow region of slightly reduced index near to the surface necessitates the tunnelling of power to these "missing modes.'' The number of such modes can be inferred from a comparison of data for two different wavelengths, and confirmation of this together with an estimation of their positions may be obtained by surface stripping. By taking them into account it has been possible to model the profile index by using a stepped base to the optical well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101397
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Buried double waveguide by ion implantation in quartz (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 89-91 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ion implantation may be used to produce barrier-confined optical waveguides in many crystalline materials by decreasing the refractive index in the nuclear stopping region at the end of the ion's track. In quartz this is particularly effective as the nuclear damage soon saturates at ∼5%, and also practically no index change occurs along the initial part of the track, thus enabling multiple-energy implants to produce broad, flat barriers. We report the use of this technique in the construction of a device with two such barriers at different depths, thus producing a pair of overlayed waveguides. The profile of this composite system could not be determined by any conventional mode analysis method, and so we have extended our dark mode reflectivity technique to cope with multiple barriers. It has proved a very powerful tool for this application, able to probe at sufficient depth below the surface to supply accurate information about the entire double profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100357
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of Tm2−xDyxFe14B and Tm2Fe14−xCoxB alloys systems (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5540-5542 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and intrinsic magnetic characteristics of Tm2−x Dyx Fe14 B (for the entire range of composition) and Tm2 Fe14−x Cox B (for x up to 4) were investigated in detail between 4.2 K and their Curie temperatures. Progressive replacement of Tm by Dy enhances the anisotropy field HA markedly. This was evidenced from the expansion of the uniaxial anisotropy temperature range determined by constructing the magnetic-phase diagram. These results are found to be in very good agreement with the crystal field theory, employing the second-order terms. Addition of Co in the lattice improves the magnetic ordering temperature, but reduces the saturation magnetization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342329
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Ion implanted waveguides in polymethylmethacrylate (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 4547-4548 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical waveguide profiles of He+ ion implanted polymethylmethacrylate have been analyzed. The surface index increases by up to 3% and the depth profile of the index is consistent with a diffusion limited decomposition of the target. This was confirmed by 77- or 300-K implants with a capping layer to inhibit decomposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343927
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    Paper (German National Licenses)
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