The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 12, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Yasutsugu TAKEDA
    1984 Volume 12 Issue 2 Pages 61-62
    Published: February 29, 1984
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.12.61
    JOURNAL FREE ACCESS
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  • Laser Diodes for Optical Disc Recording
    Toshiki HIJIKATA, Haruhisa TAKIGUCHI
    1984 Volume 12 Issue 2 Pages 63-73
    Published: February 29, 1984
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.12.63
    JOURNAL FREE ACCESS
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  • A GaAs Mode-Filter Type Light Intensity Modulator
    Shigeaki OHKE, Akira KUSUNOKI, Yoshio CHO, Yukito MATSUO
    1984 Volume 12 Issue 2 Pages 74-82
    Published: February 29, 1984
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.12.74
    JOURNAL FREE ACCESS
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    Electro-optic polarization modulation has been studied at 1.15μm in a waveguide structure formed in a Ga As reverse-biased p+ nn+ junction diode and a Schottky junction diode. For the p+ nn+ junction type, polarization modulation showed a satisfactory result with an incident beam polarization angle of 45° to the {100} crystal axis, while for the Schottky junction type, sufficient result was not obtained due to its waveguide transmission loss in a metal-clad waveguide. As for the application of the metal-clad, mode-filter type light intensity modulation was investigated in a unified Schottky junction structure of modulator-and analyzer-sections using the metal-clad with {110} crystal axis.
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  • The Electromagnetic Rocket Gun Impact Fusion Driver
    Friedwardt Winterberg
    1984 Volume 12 Issue 2 Pages 83-88
    Published: February 29, 1984
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.12.83
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    A macroparticle accelerator to be used as an impact fusion driver is discussed and which can accelerate a small projectile to -200 km/sec over a distance of a few 100 meters. The driver which we have named electromagnetic rocket gun, accelerates a small rocket-like projectile by a travelling magnetic wave. The rocket propellant not only serves as a sink to absorb the heat produced in the projectile by resistive energy losses, but at the same time is also the source of additional thrust through the heating of the propellant to high temperatures by the travelling magnetic wave. The total thrust on the projectile is the sum of the magnetic and recoil forces. In comparison to a rocket, the efficiency is here much larger, with the momentum transferred to the gun barrel of the gun rather than to a tenuous jet.
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  • The Bacteriocidal Effect of KrF Excimer Laser
    Kazuo SUZUKI, Koichi TOYODA
    1984 Volume 12 Issue 2 Pages 89-95
    Published: February 29, 1984
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.12.89
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    The bacteriocidal effect of 248 nm line of KrF excimer laser is compared with that of 253.7 nm line of conventional mercury lamp. In considering the slight difference of absorption coefficient of DNA in bacteria at these lines, sterilizing effect of both UV lights is almost same at the laser intensity below 5×188 W/m2. In the laser intensity exceeds 5×188 W/m2, survival ratio is increased. Saturation of the light absorption to the bacteria at such high intensity is considered to occure and the saturation intensity is reduced to be 3.3×109W/m2. However this saturation effect cannot be explained from the already known rate constants of the UV excitation processes of nucleic acid to damage DNA in bacteria. To use the KrF excimer laser for high sterilization, it is suitable to increase the repetition rate by keeping the irradiation intensity below the saturation intensity.
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  • Sensitivity Enhancement of Atmospheric-Gas Analysis with Lead-Salt Diode Laser through Spectral Data Processing
    Hiroya SANO, Ryuji KOGA, Megumi KOSAKA
    1984 Volume 12 Issue 2 Pages 96-100
    Published: February 29, 1984
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.12.96
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    A very high sensitivity was obtained for only a 1.4 m optical path. A tunable Pb Sn Te diode laser of 7.6μm band was employed. Etalon fringes, which are dominant optical noises, were suppressed with using off-axis parabolic mirrors as beam-collimating elements along with a wedged window. Methane spectrum of a magnitude of 5×10-5 in absolute absorption were measured though being subject to random noise and base-line distortion both greater than the methane spectrum. A spectral data processing based on the notion of the adjoint spectrum successfully deduced densities of atmospheric methane every 10 seconds over one hour. Anrms fluctuation of the results was 0.1 ppm for about an 1 ppm average value.
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  • Report on the 9th Laser Radar (Lidar) Symposium
    Toshikazu ITABE
    1984 Volume 12 Issue 2 Pages 101-105
    Published: February 29, 1984
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.12.101
    JOURNAL FREE ACCESS
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