The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 16, Issue 10
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Kenichi IGA
    1988 Volume 16 Issue 10 Pages 634-635
    Published: October 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.634
    JOURNAL FREE ACCESS
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  • Laser Interferometer Gravitational Wave Antenna
    Hope for Gravitational Wave Astronomy
    Nobuki KAWASHIMA
    1988 Volume 16 Issue 10 Pages 636-644
    Published: October 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.636
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    The present status of the laser interferometer gravitational antenna is described based on the construction of an ISAS 9.7m 102 bounce antenna. The future prospect of constructing a kilometer class antenna is also discussed together with its construction in space including the lunarsurface.
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  • Gas Phase Synthesis of Diamond Films
    Yoshiyuki GOTOH, Toshinori YAGI, Haruhiko NAGAI
    1988 Volume 16 Issue 10 Pages 645-653
    Published: October 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.645
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    Many attempts to synthesize diamond films have been made recently because of the high potentiality for various applications. The films were produced by a variety of methods, including thermal chemical vapor deposition (CVD) using a hot tungsten filament, plasma CVD and photo-induced CVD. Among these techniques, photo-induced CVD seems promising for the deposition of microelectronic materials at low temperatures.
    This paper reviews the properties of diamond, its evaluation methods and the progress in the synthesis of diamond by gas-phase deposition. Detailed descriptions are presented on the laser-induced CVD developed by us, in which diamond films are deposited on Si wafers by decomposing a gaseous mixture of CCl4 and H2 with an Ar F excimer laser. The structures of the deposited films were characterized by Raman scattering and reflection electron diffraction analysis. The experimental results obtained from an optical emission spectroscopic study and the reaction mechanism are discussed.
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  • Numerical Calculation of Shapes Machined with Pulsed YAG Laser (5th Report)
    A Method of Numerical Calculation and Calculated Results of Aluminum
    Takehiro WATANABE, Yoshitaro YOSHIDA, Chikara SHIMO
    1988 Volume 16 Issue 10 Pages 654-663
    Published: October 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.654
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    This paper describes a numerical method to estimate shapes generated by pulsed YAG laser irradiation and the results for aluminum calculated by the method. Generally, it is difficult to make a close examination of the shapes machined because of various complicated phenomena and the change in thermal constants by temperature rise in laser machining; therefore, some of parameters necessary for the calculation are determined experimentally. The change in thermal constants of a workpiece by temperature rise, the characteristics of a laser beam used, the reflectivity change of a laser beam at the work piece surface, and the laser plume generation are considered in the calculation. The results of the calculation agree well with experimental results. Irradiating conditions in laser machining, therefore, are decided easily by this computer simulation.
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  • Study on the Nd: YAG laser materials Processing Installed in FMS
    Hiroshi MIURA, Takashi SASAGAWA, Sadao SEKI
    1988 Volume 16 Issue 10 Pages 664-674
    Published: October 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.664
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    A new materials processing system with a Nd: YAG laser was developed and operated in FMS. This system was applied to remove burrs generated along the involute curve after gear cutting and to break chips generated at the finishing stage of sleeves boring. Automatic debarring and chip breaking operations have been achieved for the first time to produce gears and sleeves. Specifically speaking, a Nd: YAG laser debarring head, a chip breaking head and an optical switch were specially designed and produced. They were installed on the processing station in the FMS, together with a YAG laser oscillator and condensing optics which feed a laser beam into affine core fiber. The machine complex station interfaces the YAG laser processing system. The 3rd cell of the station traces an involute curve, thus enabling the removal of burrs, or holds a chip breaking head and bores a sleeve chucked by the 1st cell simultaneously breaking a generated chip.
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  • Cryogenic Foam Target for Laser Fusion Research
    Measurement of Hydrogen Fuel in a Foam Shell by means of β-ray Attenuation
    Toyoji MANO, Hidefumi KATAYAMA, Masaru TAKAGI, Takayoshi NORIMATSU, Ka ...
    1988 Volume 16 Issue 10 Pages 675-680
    Published: October 28, 1988
    Released on J-STAGE: July 30, 2010
    DOIhttps://doi.org/10.2184/lsj.16.675
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    The non-destructive measurement of containment of hydrogen in a cryogenic foam target is reported. Penetration of liquid hydrogen into a plastic foam shell is evaluated from measurements of β-ray attenuation through the foam shell. Freeze-dried polystyrene foam is found suitable for the cryogenic foam target material.
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  • Stabilization of Two Mode Beating Operation in an Injection-Locked TEA CO2Laser
    Koichi SASAKI, Masanobu YOSHIOKA, Takashige TSUKISHIMA
    1988 Volume 16 Issue 10 Pages 681-690
    Published: October 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.681
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    The feedback stabilization of injection-locked Two-Longitudinal-Mode-Beating (TLMB) in a TEA CO2 laser is proposed and realized. The TLMB output is to be utilized as a ponderomotive source for driven scattering plasma diagnostics. The cavity length of the TEA CO2 laser is tuned such that the frequency of the injected laser is to be located at the center between two adjacent longitudinal modes. Special provision is made to protect the feedback loop from high intensity radiation of the main laser. Power-modulated outputs with a beat-frequency of around 40 MHz are obtained with a probability of about 84 percent for fifty successive shots. The so-called plasma chirp effect is found to be negligible in the present system.
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  • Output Characteristics of Ar Excimer Laser with Various Cavity Mirrors
    Kiyoshi TAKEUCHI, Kou KUROSAWA, Wataru SASAKI, Yasuo TAKIGAWA, Kunio Y ...
    1988 Volume 16 Issue 10 Pages 691-698
    Published: October 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.691
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    Quartz glass (SiO2), silicon single crystal (Si) and molybdenum single crystal (Mo) have been tested for the cavity reflector of an argon excimer laser which supplies intense coherent radiation at 126nm. These mirrors have been used with a combination of a MgF2 output coupler. The laser output energy was found to be limited by damage threshold of the mirrors. The maximum output energy of 50mJ per pulse was obtained with the cavity composed of a Mo reflector and a MgF2coupler. No damage was observed on the Mo mirror surface. The duration of the laser output pulse depends on the argon gas pressure and also the reflectors. The mirror damage is discussed with relation to pulse shortening observed in high power rare-gas excimer lasers of Xe, Kr and Ar.
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  • Particle Formation by CO2 Laser-Induced Breakdown
    Toshiyuki OYAMA, Masayoshi KOBAYASHI, Tadahiro ISHII, Kazuo TAKEUCHI
    1988 Volume 16 Issue 10 Pages 699-704
    Published: October 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.699
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    A TEA-CO2 laser-induced breakdown technique was applied to synthesize fine powders of Band TiB2 by irradiating gas mixtures of BCl3+H2 and BCl3+TiCl4+H2 of 10-500 Torr. The products were characterized by SEM, ICP atomic emission spectroscopy and electron and X-ray diffraction. The particle sizes of the powders were controllable from 0.08 to 0.3μm by varying the total pressure of the mixed gas. The gas breakdown threshold energy of the laser pulse was found to be inversely proportional to the total pressure of the gas mixtures in a logarithmic scale, and the proportional constant was -0.52 for BCl3+H2. The yields of particles were increased with increasing laser pulse energy, whereas average particle size was constant.
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  • Report on “Topical Meeting on Laser Materials and Laser Spectroscopy”
    Takatomo SASAKI
    1988 Volume 16 Issue 10 Pages 705-711
    Published: October 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.705
    JOURNAL FREE ACCESS
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