Establishment of two-color simultaneously oscillated lasers for plasma diagnostics

• Project/Area Number: 24560053
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: Chubu University
• Principal Investigator: NAKAYAMA Kazuya 中部大学, 工学部, 准教授 (40434584)
• Co-Investigator(Kenkyū-buntansha): AKIYAMA Tsuyoshi 核融合科学研究所, ヘリカル研究部, 准教授 (80370138)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: プラズマ計測 / 干渉計測 / 偏光計測 / 炭酸ガスレーザー / テラヘルツレーザー / レーザー / テラヘルツ / 干渉偏光計測 / 干渉偏光計則

Outline of Final Research Achievements

For fusion plasma diagnostics of large and high-density plasma devices, a new measurement system using a terahertz (THz) laser of the wavelength region of 50 μm is required. In this region between light and radio wave, measurement method including the light source has not been established. Therefore, we have surveyed THz laser lines, and the measurement method and components have been developed. It is important to realize the stable laser oscillation in order to improve reliability of the measurement system. In this study, we have developed the long-time stable 48- and 57-μm THz lasers pumped by a CO2 laser.

Research Products

• [Journal Article] Stabilization of Simultaneously Oscillated 48- and 57-μm CH3OD Lasers for Plasma Diagnostics (2014)
  • Author(s): K. Nakayama, S. Okajima, T. Akiyama, K. Tanaka, K. Kawahata
  • Journal Title: Proceedings of IRMMW-THz2014 Volume: - Pages: 1-2
  • DOI: 10.1109/irmmw-thz.2014.6956485
• [Journal Article] Output couplers for optically pumped 57-μm CH3OD and 119-μm CH3OH lasers (2014)
  • Author(s): K. Nakayama, S. Okajima, T. Akiyama, K. Tanaka, K. Kawahata
  • Journal Title: Annual report of national institute for fusion science Volume: April 2013-March 2014 Pages: 182-182
• [Journal Article] Dispersion interferometer using modulation amplitudes on LHD (2014)
  • Author(s): T. Akiyama, R. Yasuhara, K. Kawahata, S. Okajima, K. Nakayama
  • Journal Title: Review of Scientific Instruments Volume: 85 Issue: 11
  • DOI: 10.1063/1.4886777
  • Peer Reviewed
• [Journal Article] Development of a powerful and stable pump 9R(8) CO2 laser for 48-μm and 57-μm CH3OD laser (2013)
  • Author(s): K. Nakayama, S. Okajima, K. Kawahata, K. Tanaka, T. Akiyama
  • Journal Title: Annual report of national institute for fusion science Volume: April 2012 - March 2013 Pages: 172-172
• [Journal Article] Characteristics of GaAs Schottky Barrier Diode in Short Wavelength Far Infrared Region and the Application (2012)
  • Author(s): 中山和也, 岡島茂樹, 川端一男, 田中謙治, 秋山毅志
  • Journal Title: IEEJ Transactions on Fundamentals and Materials Volume: 132 Issue: 9 Pages: 722-726
  • DOI: 10.1541/ieejfms.132.722
  • NAID: 10031018979
  • ISSN: 0385-4205, 1347-5533
  • Peer Reviewed
• [Journal Article] Studies of reflectivity degradation of retroreflectors in LHD and mitigation of impurity deposition using shaped diagnostic ducts and protective windows (2012)
  • Author(s): T. Akiyama, N. Yoshida, K. Kawahata, M. Tokitani, H. Iwakiri, S. Okajima, K. Nakayama
  • Journal Title: Nuclear Fusion Volume: 52 Issue: 6 Pages: 063014-063014
  • DOI: 10.1088/0029-5515/52/6/063014
  • Peer Reviewed
• [Presentation] 光アイソレーターを用いた遠赤外レーザー励起用CO2レーザーの安定化 (2015)
  • Author(s): 中山 和也、岡島 茂樹、秋山毅志、田中謙治、川端一男
  • Organizer: 応用物理学会春季学術講演会
  • Place of Presentation: 東海大学 湘南キャンパス
  • Year and Date: 2015-03-11 – 2015-03-14
• [Presentation] Faｒ-Infrared source R&D (2014)
  • Author(s): 廣瀬龍太, 吉田拓生, 加藤圭騎, 岡島 茂樹, 中山和也, 金信弘, 武内勇司, 笠原 宏太, 市村龍 哉, 奥平琢也, 森内航也, 先崎 蓮, 小川 勇
  • Organizer: 新学術領域研究「ニュートリノフロンティア」研究会
  • Place of Presentation: 富士Calm(山梨県 富士吉田市)
  • Year and Date: 2014-12-21 – 2014-12-23
• [Presentation] Preliminary results of a Nd:YAG laser dispersion interferometer (1 micron DI)) (2014)
  • Author(s): T. Akiyama, R. Yasuhara, K. Kawahata, S. Okajima, K. Nakayama
  • Organizer: 27th Meeting of the ITPA Topical Group on Diagnostics
  • Place of Presentation: St Paul Lez Durance, France
  • Year and Date: 2014-11-03 – 2014-11-07
• [Presentation] ニュートリノ崩壊光子探索用STJ検出器の較正に用いる遠赤外線源の開発 (2014)
  • Author(s): 廣瀬龍太，吉田拓生，岡島茂樹，中山和也，金信弘，武内勇司，笠原宏太，奥平琢也，小川勇，加藤幸弘
  • Organizer: 日本物理学会2014年秋季大会
  • Place of Presentation: 佐賀大学
  • Year and Date: 2014-09-18 – 2014-09-21
• [Presentation] Stabilization of Simultaneously Oscillated 48- and 57-μm CH3OD Lasers for Plasma Diagnostics (2014)
  • Author(s): K. Nakayama, S. Okajima, T. Akiyama, K. Tanaka, K. Kawahata
  • Organizer: 39th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2014
  • Place of Presentation: The University of Arizona, Tucson, Arizona, USA
  • Year and Date: 2014-09-14 – 2014-09-19
• [Presentation] Dispersion interferometer using modulation amplitudes on LHD (2014)
  • Author(s): T. Akiyama, R. Yasuhara, K. Kawahata, S. Okajima, K. Nakayama
  • Organizer: The 20th Topical Conference on High-Temperature Plasma Diagnostics
  • Place of Presentation: Georgia, USA
  • Year and Date: 2014-06-01 – 2014-06-05
  • Invited
• [Presentation] Frequency Stabilization Of A Pump 9R(8) CO2 Laser For Simultaneously Oscillated 5.2- And 6.3-THz CH3OD Lasers (2013)
  • Author(s): K. Nakayama, S. Okajima, K. Kawahata, K. Tanaka, and T. Akiyama
  • Organizer: 38th International Conference on Infrared, Millimeter, and Terahertz Waves 2013
  • Place of Presentation: Mainz, Germany
• [Presentation] プラズマ計測用50 μm帯CH3ODレーザーの励起9R(8)CO2レーザーの安定化 (2013)
  • Author(s): 中山和也，岡島茂樹，田中謙治，秋山毅志，川端一男
  • Organizer: 第74回応用物理学会秋季学術講演会
  • Place of Presentation: 同志社大学
• [Presentation] 高密度・大型核融合装置のための二波長同時発振型短波長遠赤外レーザーの開発と応用 (2013)
  • Author(s): 中山和也，岡島茂樹，川端一男，秋山毅志，田中謙治，徳沢季彦
  • Organizer: プラズマ・核融合学会 第30回年会
  • Place of Presentation: 東京工業大学
• [Presentation] ニュートリノ崩壊光子探索用STJ検出器の較正に用いる遠赤外分子レーザーの性能評価 (2013)
  • Author(s): 小村祥太，折笠桂輔，廣瀬龍太，吉田拓生，岡島茂樹，中山和也，金信弘，武内勇司，小川勇
  • Organizer: 日本物理学会 2013年 秋季大会
  • Place of Presentation: 高知大学
• [Presentation] 高密度プラズマの干渉偏光計測用2波長遠赤外レーザーの開発 (2013)
  • Author(s): 中山和也, 岡島茂樹, 川端一男, 田中謙治, 秋山毅志
  • Organizer: レーザー学会学術講演会第33回年次大会
  • Place of Presentation: 姫路商工会議所･イーグレ姫路
• [Presentation] Dispersion interferometer on LHD and prospects to future devices (2013)
  • Author(s): T. Akiyama, K. Kawahata, R. Yasuhara, S. Okajima, K. Nakayama
  • Organizer: U.S.-Japan Workshop on Millimeter Wave Technology and Fusion Plasma Fluctuation Diagnostics
  • Place of Presentation: Davis, US
• [Presentation] 長波長帯域遠赤外レーザーのデータベースの構築 (2012)
  • Author(s): 中山 和也, 岡島 茂樹, 関谷 将成, 高橋 拓眞, 小川 勇, 池田 亮介
  • Organizer: 第73回応用物理学会学術講演会
  • Place of Presentation: 愛媛大学・松山大学
• [Presentation] FIR (48-, 57-, and 119-μm) Lasers Pumped by Two CO2 Lasers for ITER Diagnostics (2012)
  • Author(s): K. Nakayama, S. Okajima, K. Kawahata, K. Tanaka, T. Akiyama
  • Organizer: The 37th International Conference on Infrared, Millimeter and Terahertz Waves
  • Place of Presentation: Wollongong, Australia
• [Presentation] Dispersion interferometer with 1 micron light source (2012)
  • Author(s): T. Akiyama, R. Yasuhara, K. Kawahata, S. Okajima, and K. Nakayama
  • Organizer: Japan-Korea Workshop on Plasma Diagnostics 2012
  • Place of Presentation: Jeju, Korea
• [Presentation] Impurity deposition on first mirror surface during hydrogen discharges in LHD (2012)
  • Author(s): T. Akiyama, N. Yoshida, M. Tokitani, S. Masuzaki, K. Kawahata, S. Okajima, and K. Nakayama
  • Organizer: 22nd International Toki Conference
  • Place of Presentation: Toki, Japan
• [Presentation] CO2 laser dispersion interferometer on LHD (2012)
  • Author(s): T. Akiyama, K. Kawahata, R. Yasuhara, S. Okajima, K. Nakayama
  • Organizer: 9th Australia-Japan workshop on plasma diagnostics
  • Place of Presentation: Naka, Japan