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Two-photon laser oscillation by using trapped atoms

Research Project

Project/Area Number 07454091
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionThe University of Tokyo

Principal Investigator

KUGA Takahiro  Univ.of Tokyo, Graduate School of Arts and Sciences Associate Professor, 大学院・総合文化研究科, 助教授 (60195419)

Co-Investigator(Kenkyū-buntansha) HIRANO Takuya  Univ.of Tokyo, Graduate School of Arts and Sciences Research Associate, 大学院・総合文化研究科, 助手 (00251330)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1995: ¥4,900,000 (Direct Cost: ¥4,900,000)
KeywordsTwo-Photon Laser / Laser Cooling / Dressed State / Intensity Correlation / Quantum Interference / Precise Spectroscopy / Doughnut-Beam Trap / Bose-Einstein Condensation / 原子トラップ / ボ-ズ凝縮 / 磁気光学トラップ / ド-ナツビーム / 電磁光学トラップ / 共振器量子電気力学 / レーザー分光 / 超微細構造 / 四光波混合
Research Abstract

We constructed an extended-cavity diode laser system and a vacuum chamber for the magneto-optical trap (MOT) of rubidium (Rb) atoms. The laser frequency was stabilized and locked to a hyperfine transition of rubidium atom under the computer control.
We performed linear and non-linear spectroscopies of Rb atoms in a vapor cell and observed optical transitions between hyperfine sublevels of ^<85>Rb and ^<87>Rb. Spectral resolution was about 6 MHz and was determined by the natural linewidth of the transitions.
About 10^8 Rb atoms were trapped in - 1mm^3 by the MOT.The atomic density was almost 100 times as large as that of the atomic beam of Ba which was first used for the two-photon laser oscillation by Mossberg in 1992. We also performed a non-linear spectroscopy with the trapped Rb atoms and many kinds of spectra were observed when we changed the configuration of laser polarizations and strehgth of the external magnetic field. These spectra were well explained by the dressed-atom picture.
Ultracold Rb atoms (- 10muK) were obtained when we applyed a polarization gradient cooling to pre-cooled atoms in the MOT.By using a dark MOT,we further increased the atomic density by 50 % form the density obtained by the normal MOT.
We developed a novel all-optical trap for neutral atoms by using a doughnut beam. The trap opens the way to a simple technique for atom manipulation, including Bose-Einstein condensation of gaseous atoms.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] T.Kuga 他5名: "Novel Optical Trap of Atoms with a Doughnut Beam" Phys.Rev.Lett.78・25. 4713-4716 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Torii 他4名: "Spectroscopic Properties of Cold Rubidium Atoms in a Magneto-Optical Trap" Prog.Crystal Grooth and Charact.33. 413-417 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Takahiro Kuga, Yoshio Torii, Noritsugu Shiokawa, Takuya Hirano, Yukiko Shimizu, and Hiroyuki Sasada: "Novel optical trap of atoms with a doughnut beam" Phys.Rev.Lett.78(25). 4713-4716 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Torii, N.Shiokawa, Y.Matsuo, T.Hirano, and T.Kuga: "Spectroscopic Properties of Cold Rubidium Atoms in a Magneto-Optic Trap" Prog.Crystal Growth and Charact.33. 413-417 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Tsukamoto et al.: "Synchronization of a Chaotic Laser Pulsation with its Prerecorded History" Phys.Rev.E. 54. 4476-4479 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y.Torii et al.: "Spectroscopic Properties of Cold Ribidium Atoms in a Magneto-Opticaal Trap" Prog.Crystal Growth and Charact.33. 413-417 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Hirano et al.: "Investigating Startistical Properties of Light from High Efficiency Light Emitting Diode" Prog.Crystal Growth and Charact.33. 339-342 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T. Hirano, T. kuga: "Generation of weak sub-Poissonian light by a high efficiency light emitting diode" IEEE Journal of Quantam Electronics. 31. 2236-2240 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] K. Nagamine 他7名: "Ultru-slow positive muon generation by laser ionization of thermal munium from hot tangstem at primary proton beam" Physical Review Letters. 74. 4811-4814 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Miyabe 他5名: "Laser system for resonant ionization of hydrogen-like atoms produced by nuclear reactions" Nuclear Instruments and Methods in Physical Research. B95. 265-275 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] G. Shinozaki 他3名: "3dB squeezing in photon number fluctuations from high speed light emitting drode" CLEO/PR technical digest. (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T. Hirano 他3名: "Inrestigatiny statistical properties of light from high efficiency light emitting diode" proceedings of Frontiers in Laser Physics and Sprctroscopy. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] T. Torii 他4名: "Spectionscopic properties of cold rubidium stoms in a mgreto-optic trop" Proceedings of Fronliers in Laser Physics Spectroscopy. (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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