The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 17, Issue 12
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    Tatsuhiko NIINA
    1989 Volume 17 Issue 12 Pages 848
    Published: December 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.12_848
    JOURNAL FREE ACCESS
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  • FIR Laser Diagnostics on the JIPP T-IIU Tokamak
    Kazuo KAWAHATA, Shigeki OKAJIMA, Akio YASUDA, Takashi AOKI, Junji FUJI ...
    1989 Volume 17 Issue 12 Pages 849-861
    Published: December 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.12_849
    JOURNAL FREE ACCESS
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    A high power cw 337-μm HCN laser has been developed for the source of plasma diagnostics on the JIPP T-IIU tokamak. Output power of about 500 mW was obtained with a 5 m long and 59 mm inner diameter waveguide laser. By use of a HCN laser developed, a multichannel interferometer, a one-channel polarimeter, and a laser scattering system with a heterodyne detection were developed for the measurements of electron and current density profiles and electron density fluctuations.
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  • Observation of the, Aathosis Area in Aorta with an Angioscope-fluorescence Analyzing System Using an Excimer-Laser Pumped Dye Laser
    Katsuo AIZAWA, Hirobumi KAWABE, Yukari YASUNAKA, Yoshihiro TAMACHI
    1989 Volume 17 Issue 12 Pages 862-866
    Published: December 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.12_862
    JOURNAL FREE ACCESS
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    An angioscope-fluorescence analyzing system was inserted into an aorta under sterile conditions. The system was capable of displaying the fine image pattern of intra-vascular structure and a fluorescence spectrum simultaneously on a monitor screen. Photofrin II was administrated intravenously into ear veins of cholesteremial rabbits and they were sacrificed after 24 hours. Photofrin II fluoresces from a progressive atherosclerotic lesion, but emits no fluorescence peaks from a normal lesion by 405 nm excitation. Thus, this system is useful for early detection of atheroscleotic lesion in an aorta.
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  • Optimum Condition for High Output Power of a Coaxial Type He-Cd II White Light Laser
    Hideshi MARUO, Tatehisa OHTA, Wakao SASAKI
    1989 Volume 17 Issue 12 Pages 867-876
    Published: December 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.12_867
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    Optimum conditions for high output power are described concerning a laser operation and a resonator for primary three colors in a coaxial type He-Cd II white light laser. Optimum discharge voltages for three-color operations are quantitatively determined by experimental data obtained from laser oscillation using for some laser tubes with the electrode dimensions designed for a white light laser. A cw white light laser with a 50-cm discharge length is accomplished under the optimum conditions for white light operation. The optimum transmission factors for three colors on the resonator are determined by simulating of laser output power. The simulation is carried out by using the experimental data of spontaneous emission light and lifetimes of the levels for white light oscillation. The results show that when most suitable mirrors are used, a 10-mW white light laser in cw oscillation can be achieved.
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  • Laser-Produced Plasma Confinement by a Magnetic Field with Geometric Mirrors
    Shigeyuki TAKAGI, Chobei YAMABE, Hidenori AKIYAMA, Kenji HORII
    1989 Volume 17 Issue 12 Pages 877-884
    Published: December 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.12_877
    JOURNAL FREE ACCESS
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    Laser-produced plasma has been generated within a surmac with geometric mirrors by focusing a TEA CO2 laser beam on a cross-linked polyethylene target. The time-dependent generation process for laser-produced plasma was observed with an image converter camera. The results indicate that two groups of plasma are formed during the generation process. In the experiments on the confinement of laser-produced plasma with the surmac, a maximum plasma potential of about 30 V was formed. A potential difference between spatially separated points was observed at the same time and gradually approached the value of an ambipolar potential.
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  • Simulation Code Development for a High Average Power Split-Disk Type Glass Laser Amplifier
    Byung Tai KIM, Masahiro NAKATSUKA, Tadashi KANABE, Sadao NAKAI
    1989 Volume 17 Issue 12 Pages 885-894
    Published: December 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.12_885
    JOURNAL FREE ACCESS
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    A split-disk geometry amplifier is reported, which uses several highly doped thin phosphate glasses instead of a single thick plate in such an ordinary disk amplifier to improve cooling efficiency. A simulation code was developed for the potential extrapolation of the experimental results under more severe pumping conditions to design the specifications of electrical parameters, disk glass thickness, Nd doping rate, and pumping cavity geometry and also to evaluate the gain coefficient of the amplifier. A gain coefficient of 0.027 cm-1 calculated in active media volume of 300 cm3 with a pumping efficiency of 0.92 % at 4 kJ pump energy agrees with the experimental value within errors of less than 10 %.
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  • Diode Pumped NYAB Green Laser
    Sho AMANO, Seiichi YOKOYAMA, Hideki KOYAMA, Satoru AMANO, Takayasu MOC ...
    1989 Volume 17 Issue 12 Pages 895-898
    Published: December 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.12_895
    JOURNAL FREE ACCESS
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    A new diode-pumped green laser has been demonstrated. A NYAB (Ndχ y1-χ Al3 (B03) 4), self-fre quency-doubling Laser crystal of type I, was pumped by a broad area laser diode. The threshold pumping power is 4.7 mW. We obtained cw green laser output up to 16 mW (0.531 μm) with a conversion efficiency of 4.4%.
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  • [title in Japanese]
    1989 Volume 17 Issue 12 Pages 899-913
    Published: December 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.12_899
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1989 Volume 17 Issue 12 Pages plate1
    Published: December 28, 1989
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.17.12_plate1
    JOURNAL FREE ACCESS
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