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Realization and characterization of a continuous-wave atom laser

Research Project

Project/Area Number 15204035
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 原子・分子・量子エレクトロニクス・プラズマ
Research InstitutionThe University of Tokyo

Principal Investigator

TORII Yoshio  The University of Tokyo, Graduate school of art and science, associate professor (40306535)

Co-Investigator(Kenkyū-buntansha) KUGA Takahiro  The university of Tokyo, Graduate school of art and science, professor (60195419)
YOSHIKAWA Yutaka  The university of Tokyo, Graduate school of art and science, research assistant (00345076)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥47,840,000 (Direct Cost: ¥36,800,000、Indirect Cost: ¥11,040,000)
Fiscal Year 2005: ¥12,740,000 (Direct Cost: ¥9,800,000、Indirect Cost: ¥2,940,000)
Fiscal Year 2004: ¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Fiscal Year 2003: ¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
KeywordsBose-Einstein condensation / laser cooling / atom laser / atom optics / ボース・アインシュタイン凝縮 / ボース・アインシュタイン凝集 / 原子ビーム / ボーズ・アインシュタイン凝縮 / レーザー分光 / 周波数安定化
Research Abstract

We have constructed a Zeeman slower of rubidium atoms which produces a slow atomic beam with a velocity of about 20 m/s. We loaded a magneto-optical trap with this slow atomic beam, resulting in a large number of cold atomic sample (about 10^10. We then trap this atomic sample with a quadrupole magnetic field which was produced by an anti-Helmholtz coil. Furthermore. With the help of another anti-Helmholtz coil, which has a different trap center, we shifted the atomic sample close to the glass surface adiabatically. As the hotter atoms selectively collide with the surface, evaporative cooling works, and the phase space density was increased by a factor of 2. To demonstrate a much larger enhancement in the phase space density, we tried to transfer the atomic sample in a quadrupole magnetic field to an Ioffe-Pritchard magnetic field which is produced by a Z-shaped wire, and adiabatically compress the atomic sample. However, the transfer efficiency was as low as 10 %, therefore we could not achieve a density high enough to perform evaporative cooling, In the future, we want to transfer the atom, captured in a MOT directly to an Ioffe-Pritchard magnetic trap, adiabatically compress, and perform evaporative cooling near the grass surface. We published a paper on the techniques of producing a high-intensity ultra-cold atomic beam (Rev. Sci. Instrum. 77, 023106(2006)) as a result of a cooperative research with MIT.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (7 results)

All 2006 2005 2004 Other

All Journal Article (5 results) Publications (2 results)

  • [Journal Article] Large atom number Bose-Einstein condensate machines2006

    • Author(s)
      E.W.Streed, et. al.
    • Journal Title

      Review of Scientific Instrument 77

      Pages: 23106-23106

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Large atom number Bose-Einstein condensate machines2006

    • Author(s)
      E. W. Streed, et. al.
    • Journal Title

      Review of Scientific Instruments 77 023106

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Large atom number Bose-Einstein condensate machines2006

    • Author(s)
      E.W.Streed, A.P.Chikkatur, T.L.Gustavson, M.Boyd, Y.Torii, D.Schneble, G.K.Campbell, D.E.Pritchard, W.Ketterle
    • Journal Title

      Review of Scientific Instrument 77

      Pages: 23106-23106

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Superradiant Light Scattering from Thermal Atomic Vapors2005

    • Author(s)
      Yutaka Yoshikawa, Yoshio Torii, Takahiro Kuga
    • Journal Title

      Physical Review Letters 94

      Pages: 83602-83602

    • Related Report
      2004 Annual Research Report
  • [Journal Article] observation of superradiant Remam scatting in a Bose-Einstein condensate2004

    • Author(s)
      Yutaka Yoshikawa, Toshiaki Sugiura, Yoshio Torii, Takahiro Kuga
    • Journal Title

      Physical Review A 69

    • Related Report
      2004 Annual Research Report
  • [Publications] Yutaka Yoshikawa: "Frequency stabilization of a laser diode with use of light-induced birefringence in an atomic vapor"Applied Optics. 42. 6645-6649 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yutaka Yoshikawa: "Observation of Superradiant Raman Scattering in a Bose-Einstein Condensate"Physical Review A. (in press).

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2021-09-03  

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