The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 29, Issue 4
Displaying 1-14 of 14 articles from this issue
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  • Future Development of Medical Lasers
    Tadashi MOROKUMA
    2001 Volume 29 Issue 4 Pages 209
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.209
    JOURNAL FREE ACCESS
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  • Special Issue on Intense Optical Field Science
    Katsumi MIDORIKAWA
    2001 Volume 29 Issue 4 Pages 210
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.210
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  • Prospects of High-Field Science
    Yoshiaki KATO
    2001 Volume 29 Issue 4 Pages 211-217
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.211
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    Electrons as well as ions are accelerated to high energy by extremely high pressure generated with intense optical field at the focus of ultrashort pulse high power lasers. Even relativistic ions couldbe generated at the intensity close to 1025 W/cm2. Development of ultra-compact accelerators and high brightness x-ray sources with T-cube lasers (table-top TW lasers) at the Advanced Photon Research Center are described.
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  • High-Power, Femtosecond Lasers and the Application to Solid State Physics
    Yasuo NABEKAWA, Taro SEKIKAWA, Tadashi TOGASHI, Shuntaro WATANABE
    2001 Volume 29 Issue 4 Pages 218-224
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.218
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    Recent progress of high-power, femtosecond lasers is described. High repetition rate (≥1 kHz) of the amplifier of Ti: sapphire laser enables us to obtain sufficient average and peak power of high order harmonics, which are novel light sources for solid state physics in VUV and XUV region.
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  • [title in Japanese]
    2001 Volume 29 Issue 4 Pages 224-224,237
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.224
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  • Phase-Matched High-Order Harmonic Generation
    Yusuke TAMAKI, Jiro ITATANI, Minoru OBARA, Katsumi MIDORIKAWA
    2001 Volume 29 Issue 4 Pages 225-232
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.225
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    A recent progress in a study on phase-matched high-order harmonic generation by intense femtosecond laser pulses is reviewed. We present a phase-matching model, which is established for enhancing brightness of high-order harmonics. Recent experimental results are also described, showing that, by employing 800-nm, 30-fs, 4-mJ laser pulses as fundamental wave, it is possible to produce a single-mode, >10 nJ light at 27 nm from 10-mm, 20-Torr argon, and single-mode, 1 nJ light at 9 nm to 26 nm from 70-Torr, 3-mm neon. Improvement of the coherence and the tunability of high-order harmonic light is also shown.
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  • Generation and Application of Ultrashort X-rays and Electrons by Intense Laser
    Mitsuru UESAKA, Kenichi KINOSHITA
    2001 Volume 29 Issue 4 Pages 233-237
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.233
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    Femto- and picosecond X-rays and electrons can be generated and used at the Femtosecond Ultrafast Quantum Phenomena Research Facility in Nuclear Engineering Research Laboratory, University of Tokyo. The beams are mainly applied to pump-and-probe analysis. The analysis utilizes two synchronized ultrashort beams. Especially, the time-resolved X-ray diffraction, which is one of the analysis, enables the dynamic visualization of atomic motions. Visualized atomic motions in coherent phonon, phase relaxation, phase transition, thermal expansion and shock wave in GaAs monocrystal irradiated by a femtosecond laser are described in this paper.
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  • Energetic Particle and Gamma Ray Production by Ultra-Intense Laser and Their Applications
    Kazuo A. TANAKA
    2001 Volume 29 Issue 4 Pages 238-242
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.238
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    Ultra-intense laser matter interactions have revealed possibilities of producing variety of energetic particles such as fast electrons, energetic ions, neutrons, and gamma rays. These products can be utilized to study many scientific and engineering fields such as fast ignition in laser fusion, particle acceleration, ultra-dense and high-pressure equation of state, gamma ray radiography etc. The details of the production are shown with examples such as laser splitting atom.
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  • Dynamics of Molecules in Intense Laser-Light Fields: New Research Directions
    Kaoru YAMANOUCHI
    2001 Volume 29 Issue 4 Pages 243-250
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.243
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    In intense laser light fields, molecules undergo a variety of characteristic processes such asalignment along laser polarization direction, dressed state formation, ultrafast structural deformation, multiple ionization, and Coulomb explosion. The investigation of the dynamical behavior of molecules in intense laser fields has afforded us invaluable opportunities to understand fundamentals of interaction between molecules and light fields as well as to manipulate molecules using characteristics of laser light fields. In the present article, I would like to describe the important aspects of this rapidly growing interdisciplinary research fields, called Molecular Science in Intense Laser Fields, and propose new directions for the next frontiers by introducing our recent studies based on (i) a quasi-stationary Floquet approach, (ii) pulsed gas electron diffraction measurements, and (iii) tandem TOF mass spectroscopy.
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  • A Method to Produce Short Pulse on a VHF-Plasma Excitation Slab-Type CO2 Laser
    Akira MORI, Yoshinobu HASHINISHI, Kaoru SUZUKI, Junji NAKATA
    2001 Volume 29 Issue 4 Pages 251-255
    Published: April 15, 2001
    Released on J-STAGE: August 04, 2010
    DOIhttps://doi.org/10.2184/lsj.29.251
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    We propose a novel method for producing a short pulse from a VHF-discharge-excitation slab-type CO2 laser using a halved confocal of an unstable concave and convex resonator. This method utilizes a full reflection concave mirror with a function of variable curvature, which can be controlled using a piezo electric device (PZT). Generally, slab-type lasers are modulated directly by varying pulse voltage; however, there is a fluctuation of plasma at the transition of the kHz pulsation. Consequently, the repetitive frequency is less than 10 kHz. On the other hand, the pulse oscillation with our method has a short pulse width of 300 ns and a maximum repetitive frequency of about 58 kHz. The peak power at the pulse oscillation is about 12 times as high as that of the CW oscillation.
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  • An Optical Method for Measuring the Diameter of Polyester Filament in Real Time
    Masahiro UEDA, Kazuhiko ISHIKAWA, Katsuhiko ASADA, Tatsuyuki OTANI, Hi ...
    2001 Volume 29 Issue 4 Pages 256-259
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.256
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    An optical method has been proposed and its system has been developed for measuring the change in diameter during the production of polyester filament in a manufacturing plant. The principle of the method is based on the application of scattered light on the filament. The sensor head of the system consisted of a semiconductor laser, two silicon-photodiodes as a light receiver, and a cylindrical lens. It was found from a preliminary experiment that (1) the scattered light intensity was not proportional to the diameter but to the cross section of the filament in the range between a few ?Em and a few tens μm, (2) the measurement error for the diameter of the polyester filament was 8 % for a scattered light intensity measurement error of 15 %, and (3) the system could be used in practical applications.
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  • Output Properties of an Optically Side-Pumped Molecular Laser
    Kyoji MATSUSHIMA, Masahiro KAJIYAMA, Masanori OHTSUKI, Masahiro TAKAI
    2001 Volume 29 Issue 4 Pages 260-267
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.260
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    This paper presents a novel type of optically pumped molecular laser and its output propertieswhich were measured for several operational parameters. This optically side-pumped laser emits a sub-millimeter wave and features a lateral incidence of the infrared pump light. The dimension of the fabricated laser is 640×190 ×185 mm3 and is considerably compact compared to conventional, optically pumped molecular lasers. The optically side-pumped laser, which operates on a CH3OH 119μm line pumped with CO2 9P (36), emitted a power of 39 μW at a pump power of 13 W. Gain profiles, absorption efficiency and the reflection loss of pump light in the new laser are theoretically discussed and compared with those of the conventional end-pumped type.
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  • Laser Propulsion at Ambient Vacuum Conditions
    Yu. A. REZUNKOV, A. A. AGEICHIK, Yu. P. GOLOVACHOV, Yu. A. KURAKIN, V. ...
    2001 Volume 29 Issue 4 Pages 268-273
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.268
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    The paper purpose is consideration of principal phenomena affecting a laser propulsion mechanism at ambient vacuum condition. The consideration is based on examination of a) conversion of laser pulse energy into a thermal energy of working gas, and b) conversion of the thermal energy into a kinetic energy of an exhaust gas of parabolic type lightcraft. If paraboloid is used like a laser jet engine unit, the process of laser energy explosion is realized at the conditions of strong variation of both radiation intensity and gas flow parameters within a parabolic type nozzle. It is shown that regimes of laser beam energy explosion, whichdepend on both laser radiation and working gas characteristics, affect strongly an amplitude of thrust impulse generated, even though momentum coupling coefficient determined via laser energy deposition does not change sufficiently.
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  • Fundamentals of Optical Communication III
    Yoichi FUJII
    2001 Volume 29 Issue 4 Pages 274-278
    Published: April 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.274
    JOURNAL FREE ACCESS
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