Development of laser sources with a sub-Hertz linewidth using

2012 Fiscal Year Final Research Report

• Project/Area Number: 23656042
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: The University of Tokyo
• Principal Investigator: TORII Yoshio 東京大学, 大学院・総合文化研究科, 准教授 (40306535)
• Research Collaborator: AOKI Takatoshitorii 東京大学, 大学院・総合文化研究科, 助教 (30328562) ; TAKEUCHI Makoto 東京大学, 大学院・総合文化研究科, 助教 (60552106) ; KUGA Takahiro 東京大学, 大学院・総合文化研究科, 教授 (60195419)
• Project Period (FY): 2011 – 2012
• Keywords: レーザー / 量子エレクトロニクス / 分光

Research Abstract

We have proven that the mechanism of laser linewidth reduction using the traditionalPound-Drever-Hall method is mathematically equivalent to that using the signal of polarization spectroscopy provided that the optical density of the atomic sample is well below unity. A proof-of-principle experiment was conducted using a Rb vapor cell. We performed polarization spectroscopy of Li6 and proved that the saturation of the transition caused by the pump beam enables polarization spectroscopy without spin polarization. As a source of Sr for spectroscopy, we examine the performance of the Sr hollow cathode lampusing the 461nm（1S0-1P1）transition and proved that polarization spectroscopy relying onpump-beam-induced saturation was possible even in a hollow cathode discharge.

Research Products

• [Journal Article] Asimplified 461-nm laser system using bluelaser diodes and a hollow cathode lamp for laser cooling of Sr (2013)
  • Author(s): Yosuke Shimada, Yuko Chida, NozomiOhtsubo, Takatoshi Aoki, Makoto Takeuch位、Takahiro Kuga, and Yoshio Torii
  • Journal Title: Review of ScientificInstruments Volume: 86 Pages: 063101
  • DOI: doi:10.1063/1.4808246
  • Peer Reviewed
• [Journal Article] (2012)
  • Author(s): Yoshio Torii, Hideyasu Tashiro, NozomiOhtsubo, and Takatoshi Aoki
  • Journal Title: Physical Review A Volume: 86 Pages: 033805
  • DOI: doi:10.1103/PhysRevA.86.033805
  • Peer Reviewed
• [Journal Article] (2012)
  • Author(s): Nozomi Ohtsubo, Takatoshi Aoki, and Yoshio Torii
  • Journal Title: Optics Letters Volume: 37 Pages: 2865
  • DOI: doi:10.1364/OL.37.002865
  • Peer Reviewed
• [Journal Article] (2012)
  • Author(s): Takatoshi Aoki, Kotaro Umezawa, Yuki Yamanaka, Naotomo Takemura, Yasuhiro Sakemi, and Yoshio Torii
  • Journal Title: Journal of the Physical Society of Japan Volume: 81 Pages: 034401
  • DOI: doi:10.1143/JPSJ.81.034401
  • Peer Reviewed
• [Presentation] Laser phase and frequencystabilization using atomic coherence,NICT Workshop on the Optical Frequency Standard (2013)
  • Author(s): Yoshio Torii
  • Organizer: 情報通信研究機構
  • Place of Presentation: 小金井市
  • Year and Date: 2013-02-07
• [Presentation] Arバッファーガス中での6Li原子の偏光分光 (2011)
  • Author(s): 大坪望、生駒大祐、青木貴稔、鳥井寿夫
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-22
• [Remarks]
  • URL: http://maildbs.c.u-tokyo.ac.jp/~torii/