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CO_2/CO slab laser excited by high frequency

Research Project

Project/Area Number 04558005
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionTokai University

Principal Investigator

FUJIOKA Tomoo  Physics, Tokai University, Professor, 理学部・物理学科, 教授 (70051381)

Co-Investigator(Kenkyū-buntansha) YABE Eiji  Development Technology, Tokai University, Professor, 開発技術研究所, 教授 (70056018)
TAKAYAMA Kazuo  Development Technology, Tokai University, Professor, 開発技術研究所, 教授 (20023690)
NANRI Kenzou  Physics, Tokai University, Professor, 理学部・物理学科, 教授 (20056211)
風間 保夫  日東工器(株), 開発技術本部, 課長
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥18,200,000 (Direct Cost: ¥18,200,000)
Fiscal Year 1994: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1993: ¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1992: ¥9,300,000 (Direct Cost: ¥9,300,000)
KeywordsGas laser / CO_2 laser / The effect of magnetic field / Plasma physics / Optical resonator / Unstablel resonator / 共振器 / 不安定共振器 / CO_2平板型レーザー / CO平板型レーザー / 高周波放電 / レーザー利得 / OI結合不安定共振器 / レーザー / 炭酸ガスレーザー / スラブレーザー / 新型レーザー
Research Abstract

A CO_2 slab laser was developed, of which size of electrodes are 5x60cm^2, excited by 80,100, and 125MHz RF power. The gas content is CO_2/N_2/He=1/1/8. The maximum power obtained are 180-200W.
5mum CO laser also oscillated with the same scheme of CO_2 slab laser at 20゚C.
The two slab lasers are coupled, of which sizes of electrodes are 3x16cm^2.
2.The effect of magnetic field on the slab laser.
The cooling is more effective for the narrower gap length in the slab laser. The gap length can be narrower when the laser is excited with the higher frequency, because the depth of the seath is inversely proportional to the excited frequency. So, the higher frequency is preferable for the higher power/cm^2, but the lower frequency such as 13.5MHz or 27MHz are easier to handle and cheaper.
When the magnetic field is applied to the plasma of slab laser, perpendicularly to the current, the path of the electron is bent and the gap length can be narrower for the higher frequency.
This effect has been theoretically analyzed and the experiment with 0-400 Gauss magnetic field is going on.
3.The two types of new unstable resonators are proposed for the star-coupled slab lasers. In one which the output from the unstable resonator is reflected back by the flat mirror, and the power is coupled out from the aperture at the center of the concave mirror. In other of which the center of the convex mirror in flat, to constitute a stable resonator there. They are theoretically analyzed and the effectiveness become clear for the star-coupled slab lasers.

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] K. Mabuchi, H. Yokota, T. Fujioka: "New Optical resonators suitable for low gain large aperture laser medium" SPIE. (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 藤岡知夫: "オプティカルパワー" 裳華房, 131 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Mabuchi, H.Yokota, T.Fujioka: "New Optical resonators suitable for low gain aperture laser medium" SPIE. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Fujioka: Optical Power. Shokabo Ltd., 131 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Mabuchi.H.Yokota,T.Fujioka: "New Optical resonators suitable for low gain large aperture laser medium" SPIE. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 藤岡,知夫: "オプティカルパワー" 裳華房, 131 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Furuya: "A new unstable resonator for large-aperture and low gain lasers" Proc.Int.Conf.Laser′92. 200-204 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Fujioka: "Industrial lasers in Japan" Proc.Int.Conf.Laser′92. 13-19 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Tsukiyama: "Flow pattern simulation of chemical oxygen iodine laser" SPIE. 1810. 204-207 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Fujioka: "A new method to obtain the best beam quarity from coil" SPIE. 1980. 202-205 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 藤岡知夫: "異端研究者とレーザー学会" レーザー学会20年の歩み. 6. (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 藤岡知夫: "これからのレーザー技術-CO_2スラブレーザーとコイルレーザー-" オプトエレクトロニクス. 136. (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Furuya,H.Tsukiyama,H.Yokota,T.Fujioka: "A new unstable vesonctor for large aperture and lowgain laser." Rroceeding of LASER 92. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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