A5102809901- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Advanced Fiber Laser Technologies
- Chalcogenide Semiconductor Thin Films
- Semiconductor Lasers and Optical Devices
- Fluid Dynamics and Vibration Analysis
- Advanced Semiconductor Detectors and Materials
- Quantum Dots Synthesis And Properties
- Theoretical and Computational Physics
- Laser Design and Applications
- Cyclone Separators and Fluid Dynamics
- Iron and Steelmaking Processes
- Aerodynamics and Fluid Dynamics Research
- Advanced Fiber Optic Sensors
- Optical Network Technologies
- Semiconductor Quantum Structures and Devices
- Solid State Laser Technologies
- Atomic and Molecular Physics
- Copper-based nanomaterials and applications
- Graphite, nuclear technology, radiation studies
- Fiber-reinforced polymer composites
- Polymer Nanocomposite Synthesis and Irradiation
- Advanced Mathematical Theories and Applications
- Metallurgy and Cultural Artifacts
- Machine Learning in Materials Science
Ritsumeikan University
1989-2023
Anritsu (Japan)
1993-2014
Hamamatsu Medical Center
2012
Kyushu University
1968-2007
Sumitomo Metal Mining (Japan)
1988-1997
Kubota (Japan)
1997
Tohoku University
1993-1995
Tottori University
1986-1988
Hokkaido University
1980-1983
Mie University
1983
The frequency of vortex shedding from two circular cylinders the same diameter in staggered arrangement is experimentally investigated at a Reynolds number 1.58 × 104. This within range where flow around cylinder relatively insensitive to changes. results are summarized several figures which one can obtain Strouhal for all arrangements distances between their centers less than 5 diameters.
The fluctuating pressures on the surface of two circular cylinders same diameter in tandem arrangement were measured upper subcritical regime to obtain distributions their rms values and spanwise circumferential correlations. These subsequently integrated yield correlation length lift drag as functions spacing between cylinders. much larger for downstream cylinder than upstream up 7.0 diameters. At 10.0 diameters, they different from those a single by only small amount.
A novel method of measuring the photorefractive sensitivity Ti-diffused channel waveguides in lithium niobate is proposed and demonstrated. It suited for quantifying dependence on irradiation beam wavelength. From measurements at various intensities wavelengths 0.633, 0.81, 1.06 μm, we give an estimate crosstalk a directional coupler as function intensity
A wavelength-tunable, three-section, distributed Bragg reflector (DBR) InGaAsP/InP laser diode is described. The refractive indices of the DBR section and phase-control are thermally controlled by thin-film heaters embedded on these passive sections. This structure enables wide-range wavelength tuning without spectral linewidth broadening accompanying conventional current injection into range 10.8 nm a less than 1.6 MHz have been achieved in 1.5- mu m region. temperature increase active...
By means of Mori's memory-function formalism generalized Brownian motions is obtained a new type continued-fraction representation the Laplace transform current-autocorrelation functions whose time evolution governed by usual Liouville operator. In this representation, memory function consists two parts. One represents effect macroscopic processes and another that microscopic processes. This generalization previously found Mori. The relationship between these representations discussed....
The fabrication and performance of a LiNbO/sub 3/-based waveguide-type polarization controller with Ti-indiffused waveguide along the z axis is reported. device, designed for use at 1.55- mu m wavelength consisting TE/TM mode converter phase shifter in series, exhibited half-wave voltages 25 20 V shifter, respectively. modal birefringence behavior respective elements under applied fields are described some detail. In addition, preliminary test device was conducted by placing Mach-Zehnder...
The authors report on DC drift characteristics with short relaxation times (typically 20-30 s) of LiNbO/sub 3/-based electrooptic switches for use at the wavelength 1.3 mu m. They evaluated switch elements without oxide buffer layers to focus substrate. Sputter-etching more than 20 nm substrate surface after waveguide fabrication results in a remarkable suppression drift: drift-induced crosstalk below -25 dB has been achieved. sputtering process also reduces range scatter voltage among four...
The first light source with a broadband spectrum in the 1800 nm wavelength region has been developed by employing cascade configuration 1.65 μm band super luminescent diode and Tm 3+ ‐doped fibre amplification unit. achieved bandwidth where intensity exceeded ‐20 dBm/nm was 247 (from 1611 to 1858 nm) low ripple, whose peak‐to‐peak value <0.15 dB.
A method for measuring the spatial variation of electrically induced index change (electrooptical effect) in Ti-diffused LiNbO/sub 3/ optical waveguides is demonstrated. By segmenting electrodes Mach-Zehnder modulators, changes at as many 45 positions on x-cut and z-cut substrates have been measured. The result confirms that within +or-3%.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Zinc selenide single crystals grown by the sublimation methods are treated in Se and/or Zn vapor of 400 to 660°C. Photoluminescence spectra these specimens measured from 16 200 K. It is found that a new emission band near 2.5 eV induced treatments, and this enhanced increasing time treatment decreased treatment. The photolumines-cence excited with variety excitation intensities time-resolved bands measured. No shift peak energy observed intensity or delay time, so not due donor-acceptor pair...
Abstract We report on a new novel method of quantifying the photorefractive effect (optically induced index change) Ti-diffused LiNbO3 optical waveguides. The evolution and decay behavior was investigated. resistivity estimated from time constant relaxation process is about same as bulk LiNbO3.
The temperature dependence of the 2.5 eV emission band, which is ascribed to SA center in ZnSe crystals and produced by Se treatments at relatively low temperature, measured from 16 200 K, analyzed taking consideration overlapping this band coppergreen crystals. It found that thermal quenching energy Huang-Rhys factor, effective frequency vibration associated with related are 130 meV, 5, 8.5 × 1012 s−1, respectively. Die mit den SA-Zentren verknüpfte 2,5 eV-Emissionsbande wird...
There are few chain-growth polymerizations that directly place electronic elements into the backbone. This polymerization can be conducted under radical conditions and authors have skillfully shown molecular-weight control with polydispersity indexes ranging from 1.14-1.66 using what is known as a RAFT (reversible addition-fragmentation chain transfer) polymerization. The polymers fluorescent potential applications in emerging polymer technologies.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text H. Masuda, Kikuchi, Mori, K. Kaneko, M. Oka, S. Kubota, and J. Alexander, "Single frequency 0.5W generation at 213nm from an injection-seeded, diode-pumped, high-repetition-rate, Q-switched Nd:YAG laser," in Advanced Solid State Lasers, C. Pollock W. Bosenberg, eds., Vol. 10 of OSA Trends Optics Photonics Series (Optica Publishing Group, 1997), paper US1. Export BibTex...
We have investigated the polarization dependent loss (PDL) of a waveguide-type scrambler/controller consisting half-wave plate (HWP) and quarter-wave (QWP) in series fabricated x-cut/z-propagating Ti-diffused LiNbO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> optical waveguides. Based on dependences both propagation coefficient mode-mismatch with fiber at 1.55 μm combined numerical analysis, PDL device is estimated to be 0.063 dB. It...
B型肝炎ウイルス（HBV）とC型肝炎ウイルス（HCV）の重複感染（HBs-Ag陽性及びHCV-RNA陽性）は，それぞれの単独感染と比べて肝硬変および肝癌を発症する割合が高いため積極的な治療が望まれる．治療に関してはPEG-IFNα，リバビリン併用療法が推奨され始めているがまだ十分な情報に乏しい．今回われわれは，HBVとHCVの重複感染2症例にインターフェロン（IFN）およびリバビリン併用療法を施行した．HBe-Ag陰性例ではHCVのSustained Virologic Response（SVR）とHBs-Agの陰性化に至った．一方でHBe-Ag陽性例はHCVのSVRを達成したがHCV消失に伴うHBVの活動性の上昇がおこり重症肝炎および急速な線維化が生じ核酸アナログを使用した．HBVとHCVの重複感染例に対する治療はウイルスの優位性を評価して選択すべきであり，症例によりIFN，リバビリンに核酸アナログを追加する必要がある．