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1994 Fiscal Year Final Research Report Summary

Sub-picosecond region two dimensional parallel information processing in photorefractive crystals

Research Project

Project/Area Number 05452108
Research Category

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

Allocation TypeSingle-year Grants
Research Field Applied optics/Quantum optical engineering
Research InstitutionUniversity of Tokyo

Principal Investigator

KURODA Kazuo  University of Tokyo Institute of Industrial Science Professor, 生産技術研究所, 教授 (10107394)

Co-Investigator(Kenkyū-buntansha) SHIMURA Tsutomu  University of Tokyo Institute of Industrial Science Lecture, 生産技術研究所, 講師 (90196543)
Project Period (FY) 1993 – 1994
KeywordsPhotorefractive effect / Parallel information processing / pico-second pulse / Hologram / Optical memory
Research Abstract

We planned and carried out the following experiments : the pico-and subpico-second light pulses which bear the spatio-temporal information are recorded in and read out from volume holograms into which the temporal evolution is mapped spatially. For this aim, we developed the method to read out recorded gratings inside the volume hologram directly by measuring the diffraction efficiency and phase of cw laser beam as a function of angle detuning from the Bragg condition. The grating envelope function is obtained by solving the coupled mode equations inside the volume hologram. Then we recorded the interference fringes between the signal and reference beams, from the 3.5-picosecond duration mode-locked frequency-doubled Nd : YAG laster, inside a photorefractive LiNbO_3 crystal and could read out the information successfully.
We measure the photorefractive sensitivities and time constants of LiNbO_3 and BaTiO_3 crystal for ultrashort pulses. We found that their responses strongly depended on the peak intensity of pulse, but they were independent of the pulse width. Especially, the sensitivity of LiNbO_3 increases an order of magnitude for intense input beams of several tens MW/cm^2. It is due to the intensity dependence of the photovoltaic effect. We also investigated the photorefractive effect of semi-insulating semiconductor GaP,and we obtained the information about its electrical state structure.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] H.Okamura: "Photorefractive crytals for recording two dimensional change of picosecond pulce" Proc.Soc.Photo-Opt.Instrum.Eng.1861. 170-173 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Okamura: "Measurement of the envelope function of indox grating in photorgfractive crystals" Optics Letters. 18. 1305-1307 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Saffman: "Tranverse instability of counterpropagating waves in photorefractive media" Physical Review A. 48. 3209-3215 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Okamura: "Spatio-tempcral recording of piwsecond light rulse in photorefractive BaTiO_3" Proc.Intl.Conf.on Laser′s '92. 539-542 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Okazaki: "Temperature dependence of the photorefractive etfect in GaP" Optics Communications. 104. 357-362 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Horiuchi: "Photorefactive and photochromic effects in undeped GaP at high tempneature21GC06:Optics Communications" 113. 487-492 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Okamura: "Measurement of photorefractive coupling constant of BaTiO_3 using the varying interaction length method" Optics Communications. 99. 230-236 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Okamura, T.Shimura, K.Kuroda, M.Itoh, and I.Ogura: "'Measurement of photorefractive coupling constant of BaTiO_3 using the varying interaction length method'" Optics Comm. 99. 230-236 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Okamura, K.Kuroda, H.Yajima, and M.Itoh: "'Photorefractive crystals for recording two-dimensional change of picosecond light pulse'" Proc.Soc.Photo-Opt.Instrum.Eng.1861. 170-173 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Okamura, K.Kuroda, H.Yajima, K.Iizuka.and M.Itoh: "'Measuremant of the envelope function of index grating in photorefractive crystals'" Opt.Lett.18. 1305-1307 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Saffman, D.Montgomery, A.A.Zozulya, K.Kuroda, and D.Z.Anderson: "'Transverse instability of counterptopagating waves in photorefractive media'" Phys.Rev.A48. 3209-3215 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Okamura, K.Kuroda, and M.Itoh: "'Spatio-temporal recording of piocosecond light pulse in photorefractive BaTiO_3'" Proc.Intl.Conf.on Lasers. 92. 539-542 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Okazaki and K.Kuroda: "'Temperature dependence of the photorefractive effect in GaP'" Optics Comm.104. 357-362 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Horiuchi and K.Kuroda: "'Photorefractive and photochromic effects in undoped GaP at high temperature'" Optics Comm.113. 487-492 (1995)

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

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Published: 1996-04-15  

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