The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 17, Issue 5
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Sadao NAKAI
    1989 Volume 17 Issue 5 Pages 344-345
    Published: May 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.5_344
    JOURNAL FREE ACCESS
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  • Flashlamp-Pumped High-Energy Dye Lasers
    Masanori JYUMONJI, Nobuo NAGAMINE, Haruo UCHIYAMA
    1989 Volume 17 Issue 5 Pages 346-357
    Published: May 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.5_346
    JOURNAL FREE ACCESS
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    Powerful and tunable lasers in the visible region are expected to be realized in the very near future, for the purpose of laser isotope separation and applications of tunable dye lasers, not only in our country but also in the United States and Europe. However, it is not so easy to realize both high power or energy and good tunability.
    In this paper, we wish to report an investigation of verious types of high-power tunable dye lasers which can be used as a pumping source for atomic uranium isotope enrichment, and high power techniques of dye laser apparatus, especially flashlamp-pumped high energy dye lasers developed in our laboratory.
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  • Laser Synthesis of Ultrafine Particles
    Tetsuro MAJIMA
    1989 Volume 17 Issue 5 Pages 358-370
    Published: May 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.5_358
    JOURNAL FREE ACCESS
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    Recent studies concerning laser synthesis of ultrafine particles are reviewed with respect to the applications of lasers in industry. Mainly a cw and a TEA CO2 lasers are used because of their high power and their easy operation. The synthetic methods are classified into (1) gas-evaporation by laser heating and (2) laser-induced reaction in the gas phase: pyrolysis, infrared multiplephoton decomposition, dielectric breakdown, and infrared photosensitized decomposition. Of these two methods, the method (2) using a CO2 laser has advantages in synthesizing ultrafine particles with high purity, small diameters, and a narrow distribution of diameters.
    The present review is focused on the synthesis of ultrafine γ-iron particles. Since γ-iron is stable at 911-1392°C, γ-iron has not been usually isolated at room temperature. However, γ-iron has been synthesized in a high yield by the SF6-sensitized infrared photodecomposition of Fe (C0) 5 with a TEA CO2 laser. γ-Iron has an average diameter of 76Å, a narrow distributiuon of diameters, the face-centered-cubic structure, and paramagnetism even at 4.2K.
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  • Uniform Laser Output Intensity Device and Its Applications
    Kenji IWASAKI, Tatsumi GOTO, Shunji HAYASHI, Susumu SHIMIZU
    1989 Volume 17 Issue 5 Pages 371-385
    Published: May 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.5_371
    JOURNAL FREE ACCESS
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    A laser beam is usually circular with a Gaussian distribution. However, frequently, a uniform output intensity distribution is required. In the device described in this paper alaser beam enters a square pillar at a predetermined divergent angle and undergoes repeated total reflection at the walls of the pillar. Thereafter, when the size of the pillar and divergent angle are suitably selected, a uniform output intensity distribution is obtained at the distal end ofthe pillar. In this paper, we described analysis of the device and the application of ruby and argon lasers to the treatment of hyperpigmented skin lesions. Also described are the applications of the device to laser marking and soldering.
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  • Fir Light Detection by Using Optogalvanic Effect
    Yoshiyuki IIDA, Hiroshi OKAMOTO, Kazuhiko NISHIZAWA, Sumio KOGOSHI, Ma ...
    1989 Volume 17 Issue 5 Pages 386-390
    Published: May 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.5_386
    JOURNAL FREE ACCESS
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    FIR laser light detection by using an optogalvanic (OG) effect was demonstrated in the same laser material gas discharge for a 118.8μm CH3OH laser. The relationship between OG signals and laser power is shown to be linear.
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  • Effect of the Cooling Fan Position for a Stabilized He-Ne Laser
    Akira SASAKI, Shinichiro HOTTA
    1989 Volume 17 Issue 5 Pages 391-395
    Published: May 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.5_391
    JOURNAL FREE ACCESS
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    Simultaneous amplitude and frequency stabilization of an internal-mirror He-Ne laser (λ=633nm) by a fan cooling method was studied at different laser-tube positions. The total back beam intensity is fed back to control the cavity length of the laser tube. Since the temperatures of the laser tube vary according to the position, its stabilization properties also vary. At the fore part of the laser tube, the relative amplitude stability was found to be ±0.08 % and the relative frequency stability to be ±5×10-9 over a period of 10 minutes or longer. At the hinder part of the laser tube, the relative amplitude stability was ±0.05 % and the rela tive frequency stability was ±3×10-9 over a period of 10 minutes or longer.
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  • [title in Japanese]
    1989 Volume 17 Issue 5 Pages plate1
    Published: May 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.5_plate1
    JOURNAL FREE ACCESS
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