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Optical pulse propagation in resonantly absorbing medium and a new definition of group velocity

Research Project

Project/Area Number 14540375
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research Institutionsizuoka university

Principal Investigator

TOMITA Makoto  sizuoka university, Faculty of Science, Professor, 理学部, 教授 (70197929)

Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywordspulse propagation / group velocity / anomalous dispersion / superluminal
Research Abstract

The purpose of the present research is to establish a new definition of a group velocity : which has a good meaning even in the long pulse propagation distance where the conventional definition of the group velocity breaks down, This new definition takes the effect of the imaginary part of the refractive index into account. The imaginary part, which inevitably exists owing to the Kromas-Kronig relation, is very essential in the pulse propagation in the resonant regions. Chirped pulses show a large Reshaping Delay owing to the spectral shift caused by the imaginary part of the refractive index. In incoherent pulses, there was no way to discuss the pulse velocity. In the present research, we define the position of the incoherent pulses by the centre of gravity, and discussed the meaning of the propagation velocity. While the Reshaping Delay in the individual incoherent pulses appears randomly, this delay is the ensemble averaged and the pulse propagates with a Net Delay.
In order to verify the above theoretical predictions, we constructed an experiment system based on a modified Michelson interferometer and a TiO2-Safire laser, and performed systematic experiments on the femtosecond pulse propagation. Form these results, we consider that the new definition of the group velocity has well meaning even in the phase modulated pulses.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Tetsu Ito, Takatoshi Haruta, Makoto Tomita: "Laser action in a two-dimensional random medium"International workshop on femtosecond technology. FST2003. 170 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tetsu Ito, Makoto Tomita: "Speckle correlation measurement in a disordered medium observed through second harmonic generation"Physical Review E. E69. 366101-366107 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tetsu Ito, Makoto Tomita: "Analysis of gain volume in random laser in a spherical multiple scattering medium"Optical Review. Vol 11. 7-11 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Makoto Tomita: "Coherence coupling effect in a space and time resolved nonlinear correlation measurement in a disordered medium"Journal of Optical Society of America. B21. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tetsu Ito, Takatoshi Haruta, Makoto Tomita: "Laser action in a two-dimensional random medium"International workshop on femtosecond technology FST2003. 170 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tetsu Ito, Makoto Tomita: "Speckle correlation measurement in a disordered medium observed through second harmonic generation"Physical Review. E69. 36610-1-36610-7 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tetsu Ito, Makoto Tomita: "Analysis of gain volume in random laser in a spherical multiple scattering medium"Optical Review. 11. 7-11 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Makoto Tomita: "Coherence coupling effect in a space and time resolved nonlinear correlation measurement in a disordered medium"Journal of the Optical Society of America. B21. (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tetsu Ito, Takatoshi Haruta, Makoto Tomita: "Laser action in a two-dimensional random medium"International workshop on femtosecond technology. FST2003. 170 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Tetsu Ito, Makoto Tomita: "Speckle correlation measurement in a disordered medium observed through second harmonic generation"Physical Review E. E69. 366xx1-366xx7 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Tetsu Ito, Makoto Tomita: "Analysis of gain volume in random laser in a spherical multiple scattering medium"Optical Review. Vol 11. 7-11 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Makoto Tomita: "Coherence coupling effect in a space and time resolved nonlinear correlation measurement in a disordered medium"Journal of Optical Society of America. B21(未定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Tetsu Ito, Makoto Tomit: "Polarization dependent laser action in a two-dimensional random medium"Physical Review E. 66. 27601-1-27601-4 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Toru Ito, Makoto Tomita: "Reshaping delay in chirped pulse propagation"International workshop on femtosecond technology. EST2002. 200-200 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Toru Ito, Tetsu Ito, Makoto: "Net and reshaping delays in chirped pulse propagation"Joint international conference on advanced science and technolog. JICAST2002. 483-486 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Tetsu Ito, Toru Ito, Makoto Tomita: "andom laser in a amplifying and scattering medium"Joint international conference on advanced science and technolog. JICAST2002. 256-259 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 大槻義彦編集: "先端物理学辞典(ISBN:462107046) (分担執筆)"丸善. (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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