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2005 Fiscal Year Final Research Report Summary

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
KeywordsBose-Einstein condensation / laser cooling / atom laser / atom optics
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.

  • Research Products

    (2 results)

All 2006

All Journal Article (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: 023106

    • Description
      「研究成果報告書概要(和文)」より
  • [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

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Published: 2010-02-04   Modified: 2021-09-03  

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