The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 20, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Yutaka TSUCHIYA
    1992 Volume 20 Issue 2 Pages 73-74
    Published: February 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.2_73
    JOURNAL FREE ACCESS
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  • High Beam Quality ArF Excimer Lasers
    Yasuo ITAKURA, Ryoichi NODOMI, Masao KAKIMOTO
    1992 Volume 20 Issue 2 Pages 75-85
    Published: February 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.2_75
    JOURNAL FREE ACCESS
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    The present status and recent efforts toward high beam quality ArF excimer laser, including the authors' experimental results, are reviewed with respect to spectral narrowing, spatial coherence, and high power operation. High-beam quality KrF lasers are also reported for comparison.
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  • Growth of Large KTP crystals
    Akio MIYAMOTO, Takatomo SASAKI, Sadao NAKAI
    1992 Volume 20 Issue 2 Pages 86-90
    Published: February 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.2_86
    JOURNAL FREE ACCESS
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    Large single KTP crystals ranging up to 32×42×87mm3 have been grown by top-seeded flux growth using large platinum crucible (150mm in diameter and 150mm in height) and a loadcell for weight measurement of a growing crystal. Solution dynamics has been investigated by simulation using silicone oil at room temperature and growth rate of the KTP crystal was found to depend strongly on the agitation effects of the solution by growing crystal. The clear crystal without in-clusion could be obtained by precisely controlling the temperature falling rate of solution.
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  • High Repetition-Rate Eximer Laser
    -3kHz, 135W Operation-
    Shigeyuki TAKAGI, Koji KAKIZAKI, Noboru OKAMOTO, Saburo SATO, Tatumi G ...
    1992 Volume 20 Issue 2 Pages 91-97
    Published: February 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.2_91
    JOURNAL FREE ACCESS
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    A high repetition-rate excimer laser has been developed. A 4-stage axial blower circulating las-er gas at more than 110m/s and a high-speed command charging power supply with a thyratron were employed for the high repetition-rate operation. The discharge region of 10×20×610mm3 is UV-preionized by pin sparkes along both sides of main electrodes. The output characteristics of XeCl were investigated both for Ne and for He buffer gas mixtures. The average power decreased abruptly at more than 2kHz in the Ne buffer gas. On the other hand, stable operation up to 3kHz was attained at a gas flow rate of 110m/s with 135W average laser power in the He buffure gas. The power decrease over at more than 2kHz in Ne is supposed to be due partially to the rise in the gas temperature caused by the blower.
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  • Effect of Pre-Excitation on the Reflectivity of the Phase-Conjugated Signal from CdSxSe1-x Doped Glass
    Toru SAKAGUCHI, Toshio FUKUMI, Masaru MIYA, Koji OHTA, Akira NAGATA
    1992 Volume 20 Issue 2 Pages 98-101
    Published: February 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.2_98
    JOURNAL FREE ACCESS
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    The effect of pre-excitation by laser pulses on the reflectivity of the phase-conjugated signal from CdSxSe1-x doped glass was examined. It was found that the reflectivity decreased in an oscillatory manner with irradiation time. We found, however, that the second-power law of re-flectivity vs. pump intensity is valid even at high pump intensity, if the reflectivity of freshly ex-posed glass is used. Thus we were able to determine the third-order nonlinear susceptibility, X (3), by plotting the reflectivity versus the pump intensity.
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  • Optical Characteristics of a 3kW DC Discharge-Excited CO Laser
    Hirotaka KANAZAWA, Naohito YAMAGUCHI, Yasunori HAMANO, Tatsuji TAIRA, ...
    1992 Volume 20 Issue 2 Pages 102-114
    Published: February 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.2_102
    JOURNAL FREE ACCESS
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    Optical characteristics of a transverse DC discharge-excited 3-kW CO laser were investigated experimentally. Significant changes of oscillation spectra with gas temperature and a resonator position were observed. The number of oscillation lines for single-line oscillation was about three times as many as normal multi-line oscillation. A novel averaged small signal gain coeffi-cient for the multi-line oscillation, which could be used for the Rigrod's formula, was defined. This is useful to design an optimum resonator also for multi-line oscillation. The small signal gain coefficient increased with decreasing gas temperature and gas pressure. The spatial dis-tribution of the small signal gain coefficient was measured, showing a strong asymmetry effect of DC discharge. The maximum of the averaged small signal gain coefficient was 0.40m-1 and that of a localized small signal gain coefficient was 0.7m-1.
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  • [title in Japanese]
    1992 Volume 20 Issue 2 Pages i
    Published: February 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.2_i
    JOURNAL FREE ACCESS
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