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INVESTIGATION OF EXCITONIC STATES CREATED BY TWO-PHOTON PAIRS IN PARAMETRIC DOWN CONVERSION.

Research Project

Project/Area Number 15540318
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics I
Research InstitutionKumamoto University

Principal Investigator

FUJII Atsuhiro  Kumamoto University, Shock Wave and Condensed Matter Research Center, Professor, 衝撃・極限環境研究センター, 教授 (30034375)

Co-Investigator(Kenkyū-buntansha) MITSUNAGA Masaharu  Kumamoto University, Faculty of Science, Professor, 理学部, 教授 (90332882)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsPARAMETRIC DOWN CONVERSION / TWO PHOTON EXCITATION / ENTANGLED STATES / EXCITONS / THALLIUM HALIDES / PHOTO-EMISSION SPECTRA / 発光機構 / 発光の時間減衰 / 励起
Research Abstract

A nonlinear crystal pumped by laser light emits highly correlated photon pairs with parametric down conversion (PDC) processes. Excitonic state in a solid excited by these PDC photon pairs is thought to be different from those excited by normal two photons. We intended to study the phenomena in TlBr crystals doped with I^- ions.
・We studied photo-luminescence due to the excitons in TlBr(I) under one photon excitation by a pulse Ti:S laser (455nm, 10ns) at different temperatures. Two broad emission bands were observed at 2.2 eV and 2.45 eV. Both emission bands decayed non-exponentially above 10 K while those decayed exponentially at 2 K. Analyzing their decay properties, these emission bands are ascribed to the two types of extrinsic self-trapping of the excitons.
・We measured photo-luminescence of the excitons in TlBr(I) under normal two-photon excitation process. Two light sources were used : the fundamental of a Ti:S laser pumped by a pulsed Nd:YAG laser and that of a mode-locked Ti:S laser, whose pulse widths were 10ns and about 100fs, respectively. The results show little differences in the luminescence spectra under the one-photon excitation and the two-photon one.
・We tried to observe the exciton luminescence under the excitation by entangled photon pairs of PDC light. The second harmonic of the ML Ti:S laser was fed to a nonlinear crystal BBO of Type II in the collinear configuration. The down converted photon pairs were found to be so small that we could not observe the exciton luminescence. Then the BBO crystal was excited by the second harmonic of the Ti:S laser whose pulse width was 10ns. The PDC light was seen to be stronger than that induced by the ML Ti:S laser. We will investigate the exciton luminescence in TlBr(I) under the excitation by entangled photon pairs of this PDC light. In addition we want to improve the output power of the ML Ti:S laser.

Report

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

    (20 results)

All 2006 2005 2004 2003 Other

All Journal Article (16 results) Publications (4 results)

  • [Journal Article] Competition between electromagnetically induced transparency and stimulated Raman scattering2006

    • Author(s)
      K.Harada
    • Journal Title

      Phys. Rev. A73

      Pages: 13807-13807

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Extrinsic self-trapping of excitons in TlBr(I)2005

    • Author(s)
      A.Fujii
    • Journal Title

      J. Lumin. 112

      Pages: 84-87

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Temperature dependence of photo-luminescence due to self-trapped excitons in TlBr(I)2005

    • Author(s)
      A.Fujii
    • Journal Title

      Cryogen. Report KUMAMOTO Univ. 16

      Pages: 17-20

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Observation of correlated anti-Stokes emissions by multiwave mixing in sodium vapor2005

    • Author(s)
      K.Motomura
    • Journal Title

      Phys. Rev. A71

      Pages: 43817-43817

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Coherent Raman beats from dark states2005

    • Author(s)
      K.Harada
    • Journal Title

      J. Opt. Soc. Am. B22

      Pages: 1105-1105

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Electromagnetically induced diffraction in sodium vapor2005

    • Author(s)
      K.Harada
    • Journal Title

      Opt. Lett. 30

      Pages: 2004-2004

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Extrinsic self-trapping of excitons in TlBr(I).2005

    • Author(s)
      A.Fujii
    • Journal Title

      J.Lumin. 112

      Pages: 84-84

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Temperature dependence of photo-luminescence due to self-trapped excitons in TlBr(I).2005

    • Author(s)
      A.Fujii
    • Journal Title

      Cryogen.Report KUMAMOTO Univ. 16

      Pages: 17-17

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Extrinsic self-trapping of excitons in TlBr(I)2005

    • Author(s)
      A.Fujii, H.Ueda, M.Tabuki, K.Miyazaki
    • Journal Title

      J.Luminescence 112

      Pages: 84-87

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Time-resolved photo-luminescence due to STE in TlBr doped with I^- ions.2004

    • Author(s)
      A.Fujii
    • Journal Title

      J.Lumin. 108

      Pages: 81-81

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Time-resolved Photo-Luminescence of Excitons induced by Extrinsic Self-Trapping in TlBr(I).2004

    • Author(s)
      A.Fujii
    • Journal Title

      Phys.Rep.Kumamoto Univ. 12

      Pages: 139-139

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Time-resolved photo-luminescence due to STE in TlBr doped with I^- ions2004

    • Author(s)
      A.Fujii, K.Takiyama, T.Haraguchi, K.Miyazaki, M.Tabuki
    • Journal Title

      J.Luminescence 108

      Pages: 81-84

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Time-resolved photo-luminescence of excitons induced by extrinsic self-trapping in TlBr(I)2004

    • Author(s)
      A.Fujii, M.Tabuki, K.Miyazai, H.Ueda, T.Shimamoto
    • Journal Title

      Phys.Reports Kumamoto Univ. 12

      Pages: 139-145

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Subkilohertz linewidths measured by heterodyne-coherent popuration trapping in sodium vapor2004

    • Author(s)
      K.Motomura, T.Kohimizu, K.Harada, H.Ueno, M.Mitunaga
    • Journal Title

      Opt.Lett. 29

      Pages: 1141-1141

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Optimization of evaporative cooling towards a large number of Bose-Einstein condensed atoms2003

    • Author(s)
      M.Yamashita, M.Koashi, T.Mukai, M.Mitsunaga, N.Imoto
    • Journal Title

      Phys.Rev. A67

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 量子干渉効果による光情報記録2003

    • Author(s)
      光永正治
    • Journal Title

      光学 32

      Pages: 229-235

    • NAID

      10011202558

    • Related Report
      2004 Annual Research Report
  • [Publications] A.Fujii, K.Takiyama, T Haraguchi, K.Miyazaki, M.Tabuki: "Time-resolved photo-luminescence due to STE in TlBr doped with I^- ions"J.Luminescence. 印刷中. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Yamashita, M.Koashi, T.Mukai, M.Mitsunaga, N.Imoto: "Optimization of evaporative cooling towards a large number of Bose-Einstein condensed atoms"Phys.Rev.. A67. 023601-1-023601-6 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 光永正治: "量子干渉効果による光情報記録"光学. 32. 229-235 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Asahi, K.Motomura, K.Harada, M.Mitsunaga: "Dark-state imaging for two-dimensional mapping of a magnetic field"Opt.Lett.. 28. 1153 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2020-05-15  

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