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Photochemistry by femtosecond pulse-train

Research Project

Project/Area Number 11440173
Research Category

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

Allocation TypeSingle-year Grants
Section一般
Research Field Physical chemistry
Research InstitutionTokyo Institute of Technology

Principal Investigator

WADA Akihide  Tokyo Inst. of Tech., Chem. Res. Lab., Assoc. Pro, 資源化学研究所, 助教授 (20202418)

Co-Investigator(Kenkyū-buntansha) KUBOTA Jun  Tokyo Inst. of Tech., Chem. Res. Lab., Res. Assoc, 資源化学研究所, 助手 (50272711)
ONDA Ken  Tokyo Inst. of Tech., Chem. Res. Lab., Res. Assoc, 資源化学研究所, 助手 (60272712)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 2000: ¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1999: ¥8,700,000 (Direct Cost: ¥8,700,000)
Keywordspulse shaping / Genetic Algorithm / ultrafast phenomena / pulse train / coherent phonon / femtosecond laser / パルストレイン / コヒーレントフォノン / 発光スペクトルの制御 / パルス圧縮
Research Abstract

In this research project, we have constructed a pulse-shaping system consisting of a mode-locked femtosecond laser and pulse-shaper. The control of pulse shape is accomplished using a programmable pulse shaper based on a Fourier transform technique where a liquid crystal spatial light modulator (LCSLM), consisting of the polarizer and liquid crystal display (LCD) which has the rectangular pixels with the width of 0.1 mm, adjusts the intensity and the phase of each spectral component of the laser pulses in the frequency domain. Furthermore, the system was controlled by the a genetic algorithm (GA) which is a powerful tool to find a pulse shape suitable for a specific physical/chemical process without the knowledge of the input pulses and the detailed structure of samples.
The GA is a multi-objective optimization method which mimics process actually taking place in the biological evolution process consisting of selection, crossover, and mutation of individuals. For the pulse shaping system controlled by the GA, the modulation pattern printed on the LCD in the SLM is regarded as the pattern of nucleotide sequence in gene by considering the pixel of the SLM as the base pair of gene. Then, the system evolves the modulation pattern in search of the pulse shapes suitable for a specific process on the basis of feedback from the experiment. In the progress of the pattern evolution, the value of the experimental output corresponds to the fitness for the environment of the organism.
We tried to control the STE creation process in perylene crystal using the system. It was found that the intensity ratio of E-type STE emission to Y-type STE emission could be changed as a function of the pulse shape.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 溝口隆一,恩田健,和田昭英 et al.: "フェムト秒パルス波形探索システム"分光研究. 49. 287-291 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Takaba,A.Wada, et al.: "Vibrational Surm-Frequency Observation of Synthetic Diamonds"Diamond and Related Materials. (accepted).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] R.Mizoguchui, K.Onda, S.S.Kano, M.Yamamura, C.Hirose, A.Wada: "Feedback-Controlled Pulse-Shaping System"J.Spec. Soc. Jp.. 49. 287-291 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Takaba, A.Wada, et al.: "Vibrational Sum-Frequency Observation of Synthetic Diamonds"Diamond and Related Materials. (in printing).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 溝口隆一,恩田健,和田昭英, et al.: "フェムト秒パルス波形探索システム"分光研究. 49. 287-291 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Takaba,A.Wada, et al.: "Vibrational Sum-Frequency Observation of Synthetic Diamonds"Diamond and Related Materials. (accepted).

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Bandara,J.Kubota,K.Onda,A.Wada,K.Domen,and C.Hirose: "Short-lived reactive formate species on NiO(111)observed by picosecond temperature jump"Surface Science. 433/435. 83-87 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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