STP1015: Laser Induced Mo Mirror Damage for High Power CO2 Laser

    Okamoto, H
    Central Research Labolatory, Nippon Mining Co., Ltd., Toda-shi, Saitama,

    Matsusue, N
    Central Research Labolatory, Nippon Mining Co., Ltd., Toda-shi, Saitama,

    Kitazima, K
    Central Research Labolatory, Nippon Mining Co., Ltd., Toda-shi, Saitama,

    Yoshida, K
    Central Research Labolatory, Nippon Mining Co., Ltd., Toda-shi, Saitama,

    Ichikawa, Y
    Central Research Labolatory, Nippon Mining Co., Ltd., Toda-shi, Saitama,

    Yamanaka, M
    Central Research Labolatory, Nippon Mining Co., Ltd., Toda-shi, Saitama,

    Yamanaka, T
    Central Research Labolatory, Nippon Mining Co., Ltd., Toda-shi, Saitama,

    Tsunawaki, Y
    Central Research Labolatory, Nippon Mining Co., Ltd., Toda-shi, Saitama,

    Pages: 13    Published: Jan 1988


    Abstract

    We have developed a high-purity molybdenum (Mo) mirror by electron-beam melting method (e.b.m. Mo mirror). Its high laser-damage threshold has been demonstrated for the high-power TEA CO2 laser system. The e.b.m. Mo mirror has a damage threshold of 2 to 4 times higher than that of an Au coated glass mirror and had a life time of 3 times longer than that of a powder metallurgy Mo mirror (p.m.Mo mirror) when the laser energy density of higher than 60 J/cm2 was irradiated. We found that on the laser-damage threshold the difference between the e.b.m. Mo mirror and the p.m.Mo mirror was due to the fine surface without voids and the small amount of impurities.

    Keywords:

    Laser mirror, molybdenum, CO, 2, laser, laser damage, polished surfaces, surface roughness, optical characterization


    Paper ID: STP18752S

    Committee/Subcommittee: F01.02

    DOI: 10.1520/STP18752S


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