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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2410-2414 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Interdiffusion at the InGaAs/InAlAs interfaces which are implanted with Si ions has been studied. Quantum well (QW) structures are grown on InP(Fe) substrates by metalorganic vapor phase epitaxy. Each sample has three InGaAs wells of 2.6, 5.9, and 17.6 nm in thickness and is separated by 24-nm-thick InAlAs barrier layers with each other. The samples are implanted with Si ions at uniform Si densities ranging from 1.8×1017 to 3.9×1019 cm−3 over the QWs, and then annealed under various annealing conditions. The photoluminescence (PL) peak energy from each well is monitored to study the intermixing at the interface. Blue shifts in the PL peak energy are found to occur almost in the early stage of thermal annealing (within 15 s) above the critical Si dose of 2–3×1018 cm−3. The saturated value of the energy shift is determined mostly by the Si density but hardly dependent on the annealing temperature and time. It is concluded that defects formed by Si ion implantation enhance the thermal interdiffusion of Ga and Al atoms at the InGaAs/InAlAs interface, which finishes when implantation-induced defects are annealed out.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2200-2202 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new scheme of noise suppression in electro-optic sampling system by the probe beam polarization modulation is proposed, its operation principle is analyzed, and the performance is demonstrated experimentally. The method has the advantages that narrow-band detection can be used instead of modulating the device under test with doubled sensitivity compared with conventional methods.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 1545-1547 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on all-optical gating characteristics of a novel low-temperature-grown asymmetric Fabry–Perot (AFP) device, in which improvement of performance with respect to conventional AFP all-optical switches is achieved by a short and coupled cavity configuration. Sub-pJ (∼800 fJ) operation is realized with a high contrast ratio (〉10 dB) over a broad wavelength range (∼7 nm). Even for 250 fJ pump pulses, a contrast ratio of 〉6 dB is obtained over a 4 nm wavelength range. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 132-134 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulse broadening is observed for the amplification of a 2.2 ps pulse by a semiconductor laser traveling-wave amplifier when the input pulse energy is well below the saturation energy of the amplifier. The broadening is found to be much larger than that predicted on the basis of homogeneous gain saturation. It is shown from a traveling-wave rate equation simulation that the nonlinear gain compression is responsible for such a large temporal broadening.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1435-5922
    Keywords: Key words: gastric ulcer ; trimebutine maleate ; electrogastrography ; gastric emptying
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract: The effects of trimebutine maleate (TM), a prokinetic drug, on gastrointestinal motility in patients with gastric ulcer were investigated. Twenty patients with active gastric ulcers were allocated to two groups; 10 patients received a proton pump inhibitor alone (PPI group), given orally, and 10 patients received oral TM in combination with a PPI (PPI + TM group), each for a period of 8 weeks. Electrogastrography (EGG) and gastric emptying were measured before and after the treatment period. During the active ulcer stage, tachygastria (more than 0.06 Hz) or bradygastria (less than 0.04 Hz) in the EGG frequency were observed in 9 patients either before or after meals. During the healed ulcer stage, tachygastria or bradygastria was observed in 4 of 10 patients in the PPI group, while in the PPI + TM group, 1 patient had tachygastria and none had bradygastria. Postprandial dip (PD) was observed in 3 of the 20 patients during the active stage, while after treatment, PD was observed in 3 patients in the PPI group and in 6 patients in the PPI + TM group, respectively. Gastric emptying in the PPI group did not show any change between before and after treatment, while that in the PPI + TM group improved significantly after treatment. These results suggest that TM may have an ameliorative effect on abnormal gastric motility in patients with gastric ulcer.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1349-9432
    Keywords: homogeneous nematic liquid crystal ; phase retardation ; birefringence ; homodyne interferometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe herein a method to measure quickly (in less than 2 min) and accurately the phase retardation between the extraordinary and ordinary axis of homogeneous or 0° twisted nematic liquid crystal panels. Owing to the homodyne detection scheme, the setup allows us to probe liquid crystal (LC) panels with an optical power down to a fraction of 1 nW and, hence makes it possible to focus the light beam to a spot of only a few wavelengths in diameter without heating or inducing observable variations in the liquid crystal. The dependence of the phase retardation on the LC driver frequency and the temperature are presented and compared with the theoretical prediction.
    Type of Medium: Electronic Resource
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