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1993 Fiscal Year Final Research Report Summary

Development of Highly-Efficient Generation-Method for Vacuum-Ultraviolet Coherent Radiation

Research Project

Project/Area Number 03554008
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

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

Principal Investigator

HAKUTA Kohzo  Univ.Electro-Commun., Dept.Appl.Phys.&Chem., Professor, 電気通信学部, 教授 (80164771)

Co-Investigator(Kenkyū-buntansha) ADACHI Hajime  Toshiba Corporation, Nuclear Enginerring Lab., Principal Researcher, 原子力研, 主査
WATANABE Shin-ichi  Univ.Electro-Commun., Dept.Appl.Phys.&Chem., Assoc. Professor, 電気通信学部, 助教授 (60210902)
SYUNSUKE Ohtani  Univ.Electro-Commun., Inst.Laser Science, Professor, レーザー研, 教授 (60023735)
Project Period (FY) 1991 – 1993
KeywordsNonlinear Optics / Inversionless Lasers / VUV-Coherent Radiation / Quantum Interferences / Atomic Hydrogen
Research Abstract

The aim of this project is to develop a new type of highly-efficient generation-method for vacuum-ultraviolet coherent radiation based on nonlinear sum-frequency generation in gas-phase atoms. Gas-phase atomic hydrogen was chosen as a nonlinear medium. Coherent VUV-radiation at 122 and 103 nm (Lyman-alpha and beta radiation) was generated without suffering resonant absorption. The most important point of this method is to use an exact resonance condition for atoms for obtaining a resonantly enhanced huge nonlinearities for the medium, and simultaneously to remove resonant absorption for obtaining a transparency for the generated radiation using quantum interferences induced by strong-coupling.
As a fundamental laser radiation source, a new type of single-longitudinal-mode pulsed-dye-laser was developed, which generates temporally smooth Fourier limit laser-pulse with smooth spatial profile. The smoothness both in temoral and spatial aspects is an essential issue to achieve experimental conditions for realizing the theoretical predictions. The nonlinear medium ; atomic hydrogen system, was prepared with a maximum atom-density of 5x10^<14> cm^<-3> at a temperature of 300 K through a microwave discharge for H_2 gas of 0.1 to 1 Torr.
Basic physical characteristics for nonlinear optical processes using quantum interferences were investigated theoretically and experimentally. The sum-frequency generation experiments were carried out under strong-coupling condition using 40 MW/cm^2 excitation intensity with an interaction length of 5 cm. A conversion efficiency of 2x10^<-4> was achieved for 122 and 103 nm radiation. The obtained efficiency is a very high value considering the atom-density and excitation intensity. The present generation method using atmic hydrogen may offer a new possibility for various applications, such as to monitor atomic hydrogen.

  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] L.Marmet: "Second Harmonic Generation at Lyman-a in Atomic Hydrogen" Optics Letters. 16. 261-263 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hakuta: "Electric-Field-Induced Second-Harmonic Generation with Reduced Absorption in Atomic Hydrogen" Physical Review Letters. 66. 596-599 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] L.Marmet: "Second Harmonic Generation in Atomic hydrogen Induced by a Charge-Separation Field" Journal of the Optical Society of America(B). 9. 1038-1046 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hakuta: "Nonlinear Optical Generation with Reduced Absorption Using Electric-Field Coupling in Atomic Hydrogen" Physical Review(A). 45. 5152-5159 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hakuta: "Second Harmonic Generation with Reduced Absorption in Atomic Hydrogen" Laser Spectroscopy X:Proceedings of Tenth International Conference on Laser Spectroscopy. 10. 301-306 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Z.Zhang: "Scanning Geometry for Broadly Tunable Single-Mode Pulsed Dye Lasers" Optics Letters. 17. 997-999 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白田耕蔵: "反転分布を持たないレーザーの概念と原子の非線形光学" 日本物理学会誌. 47. 303-306 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白田耕蔵: "反転分布のないレーザー" レーザー研究. 21. 123-124 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 張光志: "広帯域波長可変単一モードパレス色素レーザー" レーザー学会研究会報告. RTM93. 1-6 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Z.Zhang: "Nonlinear Optical Generation Using Electromagnetically Induced Transparency in Atomic Hydrogen" Physical Review Letters. 71. 3099-3102 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hakuta: "Nonlinear Optical Generation with Electromagnetically Induced Transparency in Atomic Hydrogen" AIP Conference Proceedings:Laser Spectroscopy. 290. 279-280 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白田耕蔵: "水素原子を用いた水素原子Lyman-β光の発生" レーザー学会研究会報告. RTM94. 1-6 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Z.Zhang: "Multiphoton-Ionization Asymmetries in Autler-Townes Doublet Induced by Nonlinear Optical Generation" submitted to Physical Review Letters.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白田耕蔵: "無反転分布レーザー" 学会出版センター. (出版予定).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.I.Thompson: "Nonlinear Generation of 103 nm Radiation with Electromagnetically Induced Transparency" Journal of the European Optical Society(B). (in press.).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] L.Marmet, K.Hakuta, and B.P.Stoicheff: "Second Harmonic Generation at Lyman-a in Atomic Hydrogen" Optics Letters. 16. 261 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hakuta, L.Marmet, and B.P.Stoicheff: "Electric-Field-Induced Second-Harmonic Generation with Reduced Absorption in Atomic Hydrogen" Physical Review Letters. 66. 596 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] L.Marmet, K.Hakuta, and B.P.Stoicheff: "Second Harmonic Generation in Atomic hydrogen Induced by a Charge-Separation Field" Journal of the Optical Society of America. (B), 9. 1038 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hakuta, L.Marmet, and B.P.Stoicheff: "Nonlinear Optical Generation with Reduced Absorption Using Electric-field Coupling in Atomic Hydrogen" Physical Review. (A), 45. 5152 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hakuta, L.Marmet, and B.P.Stoicheff: "Second Harmonic Generation with Reduced Absorption in Atomic Hydrogen" Laser Spectroscopy X : Proceedings of Tenth International Conference on Laser Spectroscopy. 301-306 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.Z.Zhang and K.Hakuta: "Scanning Geometry for Broadly Tunable Single-Mode Pulsed Dye Lasers" Optics Letters. 17. 997 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hakuta: "Concept of Lasing Without Inversion and Its Extension to Nonlinear Optics (in Japanese)" Monthly Journal of the Physical Society of Japan. 47. 303 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hakuta: "Lasers Without Population Inversion, (in Japanese)" Review of Laser Engineering. 21. 123 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.Z.Zhang and K.Hakuta: "Wideband Tunable Single-Mode Pulsed Dye Laser, (in Japanese)" Reports on Topical Meeting of the Laser Society of Japan. RTM-93. 1 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.Z.Zhang, K.Hakuta, and B.P.Stoicheff: "Nonlinear Optical Generation Using Electromagnetically Induced Transparency in Atomic Hydrogen" Physical Review Letters. 71. 3099 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hakuta, G.Z.Zhang, R.I.Thompson, and B.P.Stoicheff: "Nonlinear Optical Generation with Electromagnetically Induced Transparency in Atomic Hydrogen" AIP Conference Proceedings : Laser Spectroscopy. 290. 279 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hakuta, G.Z.Zhang, and S.Yoshida: "Generation of coherent Lyman-beta radiation Using Atomic Hydrogen, (in Japanese)" Reports on Topical Meeting of the Laser Society of Japan. RTM-94. 1 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.Z.Zhang and K.Hakuta: "Multiphoton-Ionization Asymmetries in Autler-Townes Doublet Induced by Nonlinear Optical Generation" Physical Review Letters. (submitted to).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.I.Thompson, B.P.Stoicheff, G.Z.Zhang, and K.Hakuta: "Nonlinear Generation of 103 nm Radiation with Electromagnetically Induced Transparency" Journal of the European Optical Society. (B) (in press.).

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

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Published: 1995-03-27  

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