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Twin beam in fibers ; its production with a wave-guide type nonlinear crystal

Research Project

Project/Area Number 08554011
Research Category

Grant-in-Aid for Scientific Research (A)

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

Principal Investigator

KUGA Takahiro  The 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) 平野 琢也  東京大学, 大学院・総合文化研究科, 助手 (00251330)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥15,300,000 (Direct Cost: ¥15,300,000)
Fiscal Year 1998: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1997: ¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1996: ¥8,200,000 (Direct Cost: ¥8,200,000)
KeywordsOptical fiber / Wave-guide type crystal / Quasi-phase matching / Twin beam / Quantum correlation / Coincidence / 凝似位相密合 / 導波路型非線形結晶 / 凝似位相整合
Research Abstract

Twin beam is a pair of optical beams that have the same statistical properties of light. Twin beam is described only by a Quantum theory and there is no classical analogue to it. In many years, twin beam has been utilized to clarify the Quantum nature of light, such as an intensity interference, photon entanglement, non-local correlation (EPR paradox) etc. Since twin beams were generated by a parametric down-conversion with bulk nonlinear crystals in most of the former works, there were unavoidable difficulties so called a geometrical problem. In the parametric down-conversion, pairs of photons are emitted in a fairly large solid angle as long as a phase match condition is satisfied. Therefore, it is almost impossible to collect all photons in pairs. On the other hand, if one uses a wave-guide type nonlinear crystal as the down-converter, pairs of photons are confined in the wave-guide and it is easy to couple them to optical fibers and detect all pairs of photons.
We utilized the wave-guide type crystal to generate the twin beam. First of all, we characterized the crystal by means of a second harmonics generation (SHG). We made a laser diode with an extended cavity oscillating in 1.55 mu m range. We measured SHG spectra and efficiency of the crystal by changing the frequency and power of the laser diode and compared them with theoretical calculations. We found a small discrepancy between experiments and calculations, but the discrepancy was acceptable if we took account of an inhomogeneity of the crystal.
Unfortunately, we can not complete our project within a given period for lack of efficient detectors in 1.55 mum region and the limitation of time to develop such detectors. However, we accumulated the basic information and data to realize twin beam in fibers. We will continue the project and complete it in the near future.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] T.Tsukamoto 他5名: "Synchronization of a laser system to a modulation signal artificially constructed from its strange attractor" Phys.Rev.E56(6). 6564-6568 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] G.Shinozaki 他4名: "3dB wide-band squeezing in photon number fluctuation from a light-emitting diode" Jpn.J.Appl.Phys.36. 6350-6352 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.Abe 他4名: "Observation of the collective Coulomb-blockade effect in a constant-current-driven high speed light-emitting diode" J.Opt.Soc.Am. B14(6). 1295-1298 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Tsubamoto 他4名: "Synclronization of a chaotic laser pulsation with its prerecorded history" Phys.Rev.E54. 4476-4479 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 佐中薫 他2名: "光導波路型非線形素子による二光子相関現象I" 日本物理学会講演概要集. 53・2. 341-341 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Sanaka, M.Kozuma, T.Kuga: "Two-photon correlation with a wave-guide type ninlinear elementl" Meeting Abstracts of the Phy.Soc.Jpn.53 (2). 341 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takayuki Tsukamoto, Maki Tachikawa, Takehisa Tohei, Takuya Hirano, Takahiro Kuga, and Tadao Shimizu: "Synchronization of a laser system to a modulation signal artificially constructed from its strange attractor" Phys.Rev.E5 6 (6). 6564-6568 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] G.Shinozaki, J.Abe, T.Hirano, T.Kuga, and M.Yamanishi: "3dB wideband squeezing in photon number fluctuation from a light emitting diode" Jpn.J.Appl.Phys.36. 6350-6352 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Jun'ichi Abe, Gen Shinozaki, Takuya Hirano, Takahiro Kuga, and Masamichi Yamanishi: "Observation of collective Coulomb-blockade effect in a constant-current-driven high-speed light-emitting diode" J.Opt.Soc.Am.B. 14 (6). 1295-1298 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Tsukamoro, M.Tachikawa, T.Hirano, T.Kuga, and T.Shimizu: "Synchronization of a Chaotic Laser Pulsation with its Prerecorded History" Phys.Rev.E54. 4476-4479 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 佐中薫.上妻幹男.久我隆弘: "光導波路型非線形素子による二光子相関現象I" 日本物理学会講演概要集. 53・2. 341-341 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Tsukamoto 他5名: "Synchronization of a lager system to a modulation signal antificially congfncted from its strange atlractor." Phys.Rev.E56. E56(6). 6564-6568 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] G.Shinozaki 他4名: "3dB wideband Sgueezing in photo number fluctuations from a light emitting deode" Jpn.J.Apple Phys. 36. 6350-6352 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Kuga 他5名: "Novel opticul trap of atoms with a doughuut beam" Rhys.Rev.Lett. 78(25). 4713-4716 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Tsukamoto et al.: "Synchronization of a Chaotic Laser Pulsation with its Prerecorded History" Plys.Rev.E. 54. 4476-4479 (1996)

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

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

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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