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INVESTIGATION OF ATOM IMAGING BY ELECTRIC FIELD

Research Project

Project/Area Number 04402010
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field 物理学一般
Research InstitutionThe University of Electro-Communications

Principal Investigator

TAKUMA Hiroshi  UNIV.OF ELECTRO-COMMUNICATIONS,INSTITUTE OF LASER SCIENCE,DIRECTOR, レーザー極限技術研究センター, 教授 (70012200)

Co-Investigator(Kenkyū-buntansha) SASAKI Akira  UNIV.OF ELECTRO-COMMUNICATIONS,INSTITUTE OF LASER SCIENCE,RESEARCH ASSISTANT, レーザー極限技術研究センター, 助手 (10215709)
SHIMIZU Kazuko  UNIV.OF ELECTRO-COMMUNICATIONS,DEP.OF APPLIED PHYS.&-CHEM., ASSOCL.PROF., 電気通信学部, 助教授 (30017446)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥17,200,000 (Direct Cost: ¥17,200,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1993: ¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1992: ¥10,800,000 (Direct Cost: ¥10,800,000)
KeywordsLASER COOLING / LASER TRAPPING / ATOM OPTICS / ATOM IMAGING / MICROWAVE LENS / 原子レンズ / レーザー冷却・トラッピング / レーザー冷却・トラップ / 極低温原子
Research Abstract

Focusing lenses are indispensable components of atom optics. Popular methods of realizing convex lenses are diffraction by near resonant laser light and by micro-fabricated transparent interferometric structures. We use electric field to realize a convex lens. The Stark effect of atoms in a stable state is negative. Therefore, atoms are pulled towards the local maximum of electric field intensity. Though it is not possible to generate a local maximum of static electric field in free space, microwave field can. We use a cylindrical microwave cavity in TM010 mode to focus a slow neon atomic beam that is generated from a trap of metastable neon atoms. The radial variation of the electric field of the TM010 mode is the 0th order Bessel function and has a maximum on axis. The diameter of the cavity is inversely proportional to the frequency. However, the focusing power increases proportional to the cube of the frequenct. Therefore, it is advantageous to use the highest frequency that can transmit entire atomic beam through the cavity. We use 17GHz microwave. The diameter and the length of the cavity are 13mm and 13 cm, respectively. The Q value of the cavity was approximately 6000. The slow atoms are vertically dropped. The pattern of the atomic beam below the cavity is detected by a micro-channel detector that can produce two-dimensional image with the resolution of approximately 50 micron meters. A clear focusing was observed at the distance 60cm below the cavity with the microwave power of 13.5W.

Report

(4 results)
  • 1997 Final Research Report Summary
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] H.Takuma,et al: "“An axially symmetric imaging system for ultra-cold neutral atoms"" Springer Prodceedings in Physics,Vol.77 Quantum Optics VI,. 3-7 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Takuma,et al: "“Observation of wave nature of ultra-cold atom"," Fundamental Problems in Quantum Theorv : A Conference Held in Honor of Professor John A.Wheeler,vol.755 of the annals of the New York Academy of Sciences,. 217-226 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Takuma, T.Nayuki, K.Shimizu and F.Shimizu: ""An axially symmetric imaging system for ultra-cold neutral atoms"" Springer Prodceedings in Physics. Vol.77 Quantum Optics VI. 3-7 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Takuma, K.Shimizu and F.Shimizu: ""Observation of wave nature of ultra-cold atom"" Fundamental Problems in Quantum Theory : A Conference Held in Honor of Professor John A.Wheeler, vol.755 of the Annals of the New York Academy of Sciences. 217-226 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Takuma et al.: "Quantum Optics V(J.Harvey & D.F.Walls,Ed.)" Springer Verlarg, (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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