Development of the ultra-stable optical cavity using a ceramic spacer

• Project/Area Number: 26400423
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Kazumoto Hosaka 国立研究開発法人産業技術総合研究所, 物理計測標準研究部門, 研究グループ長 (50462859)
• Co-Investigator(Kenkyū-buntansha): 稲場 肇 国立研究開発法人産業技術総合研究所, 物理計測標準研究部門, 研究グループ長 (70356492) ; 大久保 章 国立研究開発法人産業技術総合研究所, 物理計測標準研究部門, 主任研究員 (30635800)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2016: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
• Keywords: 光周波数標準 / 狭線幅レーザー / 低熱膨張セラミック / 光共振器 / 熱雑音 / 周波数安定化レーザー / 光時計 / 周波数安定度 / セラミック / 光格子時計

Outline of Final Research Achievements

To reduce the thermal noise on the optical cavity and achieve excellent frequency stabilities of lasers, we designed a very long cavity using an ultra-low expansion ceramic spacer. However, it was difficult for the product company to make the thick ceramic parts with the good thermal properties due to the technical problems. Therefore, we have employed another optical cavity that has crystalline coatings on the mirrors, because the crystalline coating mirror has high mechanical Q factor. Using the cavity, we expect that the thermal noise limit of the frequency stability will be about one tenth of that for the previous optical cavity.

Research Products

• [Presentation] Precise frequency comparison of clocks considering the dead time uncertainty of frequency link (2016)
  • Author(s): Takehiko Tanabe, Daisuke Akamatsu, Takumi Kobayashi, Akifumi Takamizawa, Shinya Yanagimachi, Takeshi Ikegami, Tomonari Suzuyama, Hajime Inaba, Sho Okubo, Masami Yasuda, Feng-Lei Hong, Atsushi Onae, and Kazumoto Hosaka
  • Organizer: EFTF 2016
  • Place of Presentation: 英国、York
  • Year and Date: 2016-04-05
  • Int'l Joint Research
• [Presentation] Precise frequency comparison of clocks considering the dead time uncertainty of frequency link (2016)
  • Author(s): Kazumoto Hosaka
  • Organizer: EFTF2016
  • Place of Presentation: York, UK
  • Year and Date: 2016-04-05
  • Int'l Joint Research
• [Presentation] Accurate frequency comparison of clocks considering the effect of the distributed dead-time (2015)
  • Author(s): Kazumoto Hosaka
  • Organizer: ATF2015
  • Place of Presentation: 北京、中国
  • Year and Date: 2015-10-31
  • Int'l Joint Research
• [Presentation] 長さの国家標準としての光コムとその応用動向 (2015)
  • Author(s): 保坂一元
  • Organizer: 精密工学会2015年秋季大会
  • Place of Presentation: 仙台
  • Year and Date: 2015-09-04
• [Presentation] A dual optical lattice clock driven by clock lasers stabilized to a narrow linewidth comb (2015)
  • Author(s): Kazumoto Hosaka
  • Organizer: IFCS-EFTF 2015
  • Place of Presentation: Denver, USA
  • Year and Date: 2015-04-13
• [Presentation] A dual optical lattice clock driven by clock lasers stabilized to a narrow linewidth comb (2015)
  • Author(s): Kazumoto Hosaka
  • Organizer: EFTF-IFCS 2015
  • Place of Presentation: Denver, USA
  • Year and Date: 2015-04-12
  • Int'l Joint Research
• [Presentation] 光コムを用いた波長の異なる狭線幅レーザーの周波数安定度測定 (2014)
  • Author(s): 保坂一元
  • Organizer: 第75回応用物理学会秋季講演会
  • Place of Presentation: 北海道大学（北海道札幌市）
  • Year and Date: 2014-09-18