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  • 1990-1994  (5)
  • 1991  (5)
Material
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  • 1990-1994  (5)
Year
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6844-6849 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Data are presented on the continuous (cw) 77–200 K operational characteristics of cw 300-K AlxGa1−xAs-GaAs quantum-well heterostructure diode lasers grown on Si substrates. Operation is demonstrated for over 500 h with a junction temperature as high as ∼200 K for a diode previously operated cw 300 K for over 10 h with its junction side mounted away from the heat sink. The data indicate that longer cw 300-K lifetimes than previously demonstrated (17 h) may be possible. The effects of the optical power level on the degradation rate are examined, and it is shown that the maximum cw 300-K power output for these devices (∼30 mW/facet) is limited by catastrophic facet degradation. The effects of naturally occurring microcracks on device stability are also considered, and the effect of stress on the output polarization is measured and discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Data are presented on a high-performance native-oxide coupled-stripe AlyGa1−yAs-GaAs-InxGa1−xAs quantum well heterostructure laser realized by the recently introduced simple process of "wet'' oxidation (H2O vapor+N2,(approximately-greater-than)400 °C, 3 h) of the upper AlyGa1−yAs confining layer. If the native oxide between active stripes (ten 5 μm stripes on 10 μm centers) is brought into closer proximity with the waveguide and quantum well region (i.e., from 0.53 to 0.4 μm), the 10-stripe laser operates decoupled because of increased (coupling) absorption losses and some index guiding.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1755-1757 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new form of planar index-guided laser diode is demonstrated with a relatively thick (∼0.4 μm) native oxide employed to define the lateral optical waveguide (transverse to the laser stripe). Oxidation of high-gap AlxGa1−xAs in a "wet'' ambient results in the transformation of most of the upper confining layer to a lower-index current-blocking native oxide outside of the active stripe. Planar quantum well heterostructure (QWH) AlxGa1−xAs-GaAs laser diodes fabricated by this process exhibit both optical and current confinement. Continuous 300 K threshold currents as low as 10 mA (uncoated facets) and kink-free single-longitudinal-mode operation are demonstrated for ∼2-μm-wide active region devices.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2838-2840 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Data are presented demonstrating AlxGa1−xAs-GaAs quantum well heterostructure laser diodes consisting of an array of coupled cavities (19 μm long on 22 μm centers, ∼250 μm total length) arranged lengthwise in single 10-μm-wide laser stripes. The cavities are defined by a native oxide formed from a significant portion of the high-gap AlxGa1−xAs upper confining layer. The native oxide (grown at 425 °C in H2O vapor+N2 carrier gas) confines the injected carriers and optical field within the cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe. These diodes exhibit single-longitudinal-mode operation over an extended range (relative to similar diodes fabricated without multiple cavities). At high current injection levels, longitudinal-mode spectra demonstrate unambiguously oscillation from the internal coupled cavities.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Wir berichten über ein achtjähriges Mädchen, das sechs Wochen nach zwei Zeckenstichen an einer akuten Fazialisparese begleitet von Kopfschmerzen, Müdigkeit, Arthralgien und Myalgien erkrankte. Die körperliche Untersuchung ergab außer der linksseitigen Fazialisparese keine weiteren Auffälligkeiten. Die Entzündungsparameter in Blutbild, BKS und CRP waren im Normbereich. Die Lumbalpunktion ergab einen Eiweißgehalt von 63 mg/dl, Glukose 45 mg/dl und keine Zellen. Die IFT-Titer gegenBorrelia burgdorferi waren im Serum und Liquor signifikant erhöht. Eine positive Westernblot-Untersuchung unterstützte die Diagnose. Die Behandlung wurde mit Ceftriaxon i.v. über 14 Tage durchgeführt. Innerhalb von fünf Tagen konnte eine deutliche Befundbesserung registriert werden. Die Liquoruntersuchung kann bei Patienten mit Fazialisparese durch parallele Bestimmung von IFT- Titern gegenBorrelia burgdorferi in Serum und Liquor zur Diagnosestellung „Lyme-Borreliose“ beitragen, auch wenn der Liquorstatus keine oder nur geringe Entzündungszeichen ergibt.
    Notes: Summary This is a report on an eight-year-old girl who presented with facial palsy, headache, fatigue, arthralgias and myalgias six weeks after two tick bites. Physical examination was unremarkable with the exception of a left-sided facial palsy. Laboratory investigation revealed normal complete blood count, ESR and CRP. The spinal tap showed a protein of 63 mg/dl, glucose 45 mg/dl and no cells. IFT titres toBorrelia burgdorferi in serum and CSF were significantly elevated. The diagnosis was supported by Western blot analysis. Treatment was started with ceftriaxone i.v. for a total of 14 days. Under this therapeutic regimen the patient improved substantially within five days. Investigation of CSF in patients with facial palsy may help to establish the diagnosis of Lyme disease by simultaneously measuring IFT toB. burgdorferi in serum and spinal fluid, even in cases where CSF shows little or no signs of inflammation.
    Type of Medium: Electronic Resource
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