The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 23, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    Noboru MATAGA
    1995 Volume 23 Issue 3 Pages 209
    Published: March 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.209
    JOURNAL FREE ACCESS
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  • Long Life Operation of a Copper Vapor Laser
    Hironobu KIMURA, Ryoichi OTANI, Nobutada AOKI, Chikara KONAGAI, Shimpe ...
    1995 Volume 23 Issue 3 Pages 210-219
    Published: March 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.210
    JOURNAL FREE ACCESS
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    The operating life of a copper vapor laser (CVL) with a 6 cm diameter / 200 cm discharge length laser tube has been successfully extended and continuous operation for 320 hours at an output power of 75±10 W has been demonstrated. With a view to improving the long-term performance and reliability of CVL operation, this paper reports the experimental results of investigating the relationship between copper loss rate and buffer gas condition (flow rate and pressure). Also discussed are the optimum laser operating conditions for minimizing copper loss. Aveage thyratron life has also been extended to 1, 000 hours or more by using the magnetic assist technique for the CVL pulsed power supply.
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  • A Study of High-Power CO2 Laser Welding Process
    Laser Welding Properties of Laser-cut Surface Joints
    Seiichiro KIMURA, Yoshinobu MAKINO, Masayuki IKEDA
    1995 Volume 23 Issue 3 Pages 220-229
    Published: March 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.220
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    We investgated high power CO2 laser welding properties of stainless steel (SUS304) using a laser-cut surface as a welding joint surface. We used O2 and N2 gas-assisted laser cutting and a conventional machined surface in this experiment. Results showed that the tensile strength and an impact value of O2 gas-assisted laser-cut surface welding joints were 10% and 50%, relatively lower than other joints, because oxide film obtained by O2 gas assisted-laser cutting, disolved in the weld zone, and its ductility was reduced. Rather straight bead shape was obtained when using O2 gas-assisted laser-cut surface welding.
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  • Optical and Mechanical Properties of a Silver Halide Fiber
    Fumio SUGATA, Kouichi OHMORI, Teruo TANAKA, Takayoshi YUUZU
    1995 Volume 23 Issue 3 Pages 230-236
    Published: March 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.230
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    We have developed a crystalline infrared fiber using silver halide to transmit a CO2 laser beam. The most preferable composition for the fiber was investigated and found to be 43 weight % AgCl and 57 weight % AgBr; the fiber of this composition exhibits the most superior mechanical strength. Then we examined to find the most suitable conditions and method of the fiber extrusion.
    The fiber thus obtained exhibits superior physical characteristics, a transmission loss as low as 0.2 dB/m, the minimum bend radius of 2cm and so on. We found some weak points of the fiber under high humidity and unfiltered fluoresent light. If the fiber could be protected from the weak points by structuring a cable, it is ideal for medical use.
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  • Development of a Lidar System for Measurement of Nitrogen Dioxide Using a Tunable Solid-State Laser
    Ryoichi TORIUMI, Hideo TAI, Nobuo TAKEUCHI
    1995 Volume 23 Issue 3 Pages 237-243
    Published: March 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.237
    JOURNAL FREE ACCESS
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    A differential absorption lidar (DIAL) system based on a tunable solid-state Ti: sapphire laser was developed for nitrogen dioxide monitoring in the blue region. An efficient blue generation scheme was realized by the sum-frequency mixing between a Ti: sapphire laser and another Nd: YAG laser. In order to reduce the effect of the atmospheric condition change, the laser wavelength was switched on-and-off resonant in every shot, and the data were averaged over a large number of shots. As an example of measurement, a concentration distribution of nitrogen dioxide from diesel engine emission was measured in the good agreement with an insitu measurement.
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  • A Solar Laser Consisting of a Solar Cell and a Laser Diode
    Kazuhiro WADA, Kouichi YOSHIOKA, Noriaki TSUTSUMI, Masanobu YAMANAKA
    1995 Volume 23 Issue 3 Pages 244-248
    Published: March 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.244
    JOURNAL FREE ACCESS
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    To prove the principle of a solar laser, a laser diode was directly operated by a current from a solar cell. Average laser power of 2.5 mW (5 mW standard) per a laser diode was obtained at a voltage of 2.2 V, however, the power was decreased by a cloud which shut out the sunlight. As the operation current of the laser diode is limited to 70 mA, it is necessary for avoiding the damage of the laser diode to choose a proper laod resistance of the circuit. It was found that the value of resistance 2Ω was suitable for the present system.
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