A5060178540- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Laser Design and Applications
- Laser-induced spectroscopy and plasma
- Photorefractive and Nonlinear Optics
- Atomic and Molecular Physics
- Solid State Laser Technologies
- Advanced Antenna and Metasurface Technologies
- Advanced X-ray Imaging Techniques
- Photonic Crystal and Fiber Optics
- Electromagnetic Scattering and Analysis
- Particle Accelerators and Free-Electron Lasers
- Laser Material Processing Techniques
- Microwave and Dielectric Measurement Techniques
- Optical Network Technologies
- Advanced Photonic Communication Systems
- High-pressure geophysics and materials
- Electrostatics and Colloid Interactions
- Optical Coherence Tomography Applications
- Optical Coatings and Gratings
- Sexual function and dysfunction studies
- Advanced machining processes and optimization
Hallym University Medical Center
2018
Gwangju Institute of Science and Technology
2007-2015
University of California, San Francisco
2015
Korea Photonics Technology Institute
2006-2010
Japan Atomic Energy Agency
2009
Rutherford Appleton Laboratory
2009
Osaka University
2009
Lund University
2009
University of Strathclyde
2009
Queen's University Belfast
2009
High-flux energetic protons whose maximum energies are up to 4MeV generated by an intense femtosecond titanium:sapphire laser pulse interacting with 7.5, 12.5, and 25μm thick polyimide tape targets. Laser energy of 1.7J a duration 34fs is focused f/3.4 parabolic mirror giving intensity 3×1019Wcm−2. The main amplified spontaneous emission (ASE) contrast ratio 2.5×107. conversion efficiency from the into proton kinetic achieved be ∼3%, which comparable or even higher than those in previous...
A variant of a grazing-incidence pumping (GRIP) scheme for Ni-like x-ray lasers using single shaped pulse from 10-Hz Ti:sapphire laser system has been demonstrated. Experimental and numerical results show that efficient excitation leading to the lasing process can be achieved by controlled shaping pump pulse. Such defined silver slab target. gain coefficient as high $76\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ was estimated. Results indicate nanosecond amplified spontaneous...
Using three different laser systems, we demonstrate a convenient and simple plasma based diagnostic of the contrast high-power short-pulse lasers. The technique is on measuring specular reflectivity from solid target. remains high even at relativistic intensities above 1019 W/cm2 in case high-contrast prepulse-free laser. On contrary, drops with increasing systems insufficient due to beam breakup increased absorption caused by preplasma.
Memantine is a non-competitive N-methyl-D-aspartate (NMDA) receptor antagonist used to treat Alzheimer's disease. We investigated memantine pharmacokinetics after oral, IV and patch administration in rats, compared multiple- or single-dose oral transdermal administration. Venous blood was collected at preset intervals single- multiple-dose studies. Non-compartmental analysed for all formulations. The doses were 10 mg/kg, 2 mg/kg 8.21 ± 0.89 respectively. maximum plasma concentration lower...
Characteristics of electron beams produced by the laser wakefield acceleration are presented. The dependence beam parameters on focal spot size is investigated. experimental result shows generation quasimonoenergetic although was several times larger than plasma wavelength. Stable at large spots owing to stable propagation in channels. At a small spot, quality poor and this attributed filamentation instability beam.
We theoretically and experimentally investigated a novel walk-off-compensation method for efficient ultraviolet beam generation. Through theoretical investigation, we described in detail how the power of generated UV can be enhanced by method; thus, obtained brief expression output which has prediction error about 30%. In addition, found that quality also using this method. experiments an alpha barium borate crystal as walk-off compensator, increased 1.9 times.
An ion spectrometer, composed of a time-of-flight spectrometer (TOFS) and Thomson parabola (TPS), has been developed to measure energy spectra analyze species laser-driven ions. Two spectrometers can be operated simultaneously, thereby facilitate compare the independently measured data combine advantages each spectrometer. Real-time shot-to-shot characterizations have possible with TOFS, ions analyzed TPS. The two show very good agreement maximum proton even for single laser shot. composite...
We propose a new in-line wavelength measurement technique based on one-dimensional fiber end-surface grating for monitoring signals in coarse wavelength-division multiplexing. The was fabricated with femtosecond laser pulses by inscribing microstructure the cleaved surface of thermally expanded core and diffracted beam patterns from were experimentally analyzed according to input light
We have demonstrated the waveguide-type tunable wavelength filtering (Sole filter) characteristics in an 80-mm-long periodically poled Ti: LiNbO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (Ti: PPLN) channel waveguide which has a domain period of 16.6 mum. At room temperature (25degC), center and full-width at half-maximum filter were about 1273.3 0.21 nm, respectively. By changing PPLN waveguide, we tuned with tuning rate -0.683...
All-optical wavelength tuning in a waveguide-type Šolc filter based on Ti:PPLN waveguide has been demonstrated for the first time by ultraviolet illumination. The measured rate as function of UV intensity was about −26.42 nm/W cm−2.
We report an all-fiber wavelength-tunable bandpass filter with multimode to single-mode converting property via serially concatenated structure of a helicoidal long-period fiber grating (HLPFG), ring-core hollow optical (HOF), and (MMF). After passing the cascaded HLPFG-ring core HOF-MMF, filtering characteristic mode conversion between were realized at resonant wavelength HLPFG. Due novel spectral functionality HLPFG for directional torsion helix, proposed device also showed operation low...
We characterized a Ni-like silver soft x-ray laser realized as, what we believe is, new variant of the grazing incidence pumping (GRIP) scheme. The was pumped by single profiled pulse from 10 Hz Ti:sapphire system. Ag saturated with gain coefficient 76 cm−1 and an effective gain-length product 28.2. spatial characteristics version GRIP are presented including far- near-field beam profiles. Computational modeling lasing conditions used to provide some qualitative explanations physical...
TEM-wave scattering on a coaxial line terminated by gap is theoretically investigated. The Fourier transform and the mode matching are used to obtain rapidly convergent series solution. Our solution compared with Marcuvitz result based small-aperture method. Computations performed illustrate phase behavior of reflection versus variation.
The radiation from a flanged coaxial line into dielectric slab is investigated in this paper. Hankel transform and mode-matching technique are used to obtain simultaneous equations for the modal coefficients. residue calculus utilized represent solution rapidly convergent series. Numerical computations performed illustrate behavior of reflection terms permittivity, frequency, coaxial-line geometry.
We report an all-fiber bandpass filter (BPF) based on a null core hollow optical fiber serially concatenated between pair of helicoidal long-period gratings (HLPFGs) with flexible transmission control capability. With novel spectral functionality HLPFGs that can be varied by the torsional stress to helix, and mode blocking in fiber, proposed device showed unique BPF characteristics whose altered along low polarization-dependent loss thermal variation, which have not observed prior...
Abstract Udenafil is a phosphodiesterase‐5 inhibitor used to treat erectile dysfunction. Although udenafil not predominantly eliminated by the kidney, renal impairment can alter its secretion/transport pathways. Drug pharmacokinetics and safety must therefore be assessed in subjects with impairment. We investigated effects of impaired function on single 100‐mg oral dose single‐dose, open‐label, parallel‐group study 31 subjects. Cockcroft‐Gault creatinine clearance was stratify these into...
A novel multiwavelength switchable SOA-fibre ring laser incorporating digital micromirrors is demonstrated. By controlling the states of micromirrors, flexible allocation wavelength channels and switching operations achieved. Up to 12 with 0.8 nm spacing at room temperature are generated.
We report temperature insensitive strain sensor based on long period fiber grating pair by partially tapering a photonic crystal under CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> laser irradiation and experimantally investigated its novel mechanical chracteristics thermal properies for optical sensing.
We propose highly sensitive strain and bending sensor with very low temperature sensitivity based on in line Mach-Zehnder Interferometer solid core large mode area photonic crystal fiber experimentally investigated its novel characteristics.
We have performed simultaneous proton and X-ray imaging with an ultra-short high-intensity Ti: Sap laser system. More than 1010 protons, whose maximum energy reaches 2.5 MeV, were delivered within a ~ps bunch. At the same time, keV is generated at almost place where protons are emitted. of copper mesh by using x-ray beams, in practical use characteristics produced plasma that it can provide those beams simultaneously without any serious problems on synchronization.
TM scattering from a hollow, slotted, circular cylinder with thickness is investigated. The mode-matching technique (MMT) used to express the scattered and guided fields in angular spectral domain terms of radial waveguide mode. boundary conditions are enforced on conducting surface slot obtain simultaneous equations. equations solved represent an analytic series form. computed results very good agreement other data. numerical computations performed illustrate behavior cylindrical geometry,...
We have developed a 100-kHz high-power downchirped-pulse-amplification (DPA) Ti:sapphire laser. A regenerative amplifier, acoustooptically switched and pumped by Q-switched green laser, is employed for the high-energy amplification with high repetition rate. Dispersion control achieved, based on DPA technique, use of prism-grating stretcher SF10 glass compressor. obtained 28 μJ 45 fs laser pulses at 100 kHz compression efficiency 95%, further down to 20 possible due broad amplified spectrum.
The electrostatic potential and charge density due to a drop across slit in thick conducting plane are obtained analytic closed form. Fourier transform, mode matching, superposition used represent the spectral domain. residue calculus is applied distribution converging series Numerical computations performed illustrate charge-density through slit.