OHMORI GROUP

MEMBERS

Technical Associate Yasuaki Okano

Laser Research Center for Molecular Science,
Institute for Molecular Science (IMS),
National Institutes of Natural Sciences

38 Nishigo-Naka, Myodaiji,
Okazaki 444-8585, Japan
TEL +81-564-55-7480
FAX +81-564-53-5727
yokano[AT]ims.ac.jp

CV

October 2009 - Present Technical Associate at Laser Research Center, Institute for Molecular Science
May 2008 - September 2009 Project Assistant Professor at Department of Chemistry, Graduate School of Science, the University of Tokyo
April 2006 - April 2008 Postdoctoral fellow at Institute of Laser Engineering, Osaka University
April 2004 - March 2006 Research Associate at NTT Basic Research Laboratories, NTT Corporation
March 2004 Doctor of Science from Department of Innovative and Engineered Materials, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

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Publications

  1. "Quantitative measurement of hard X-ray spectra for high intensity laser produced plasma,"
    Z. Zhang, H. Nishimura, and Y. Okano et al.,
    High Energy Density Physics 9, 435-438 (2013).
  2. "Quantitative measurement of hard X-ray spectra for high intensity laser produced plasma,"
    Z. Zhang, H. Nishimura, and Y. Okano et al.,
    Rev. Sci. Instrum. 83, 053502 (2012).
  3. "Optical manipulation of coherent phonons in superconducting YBa2Cu3O7-d thin films,"
    Y. Okano, H. Katsuki, Y. Nakagawa, H. Takahashi, K. G. Nakamura, and K. Ohmori,
    Faraday Discussions 153, 375-382 (2011). [invited paper]
  4. "Efficient multi-keV x-ray generation from a high-Z target irradiated with a clean ultra-short laser pulse,"
    Z. Zhang, H. Nishimura, and Y. Okano et al.,
    Optics Express 19, 4560-4565 (2011).
  5. "Dynamics of femtosecond-laser-ablated liquid-aluminum nanoparticles probed by means of spatiotemporally resolved X-ray absorption spectroscopy,"
    H. Nakano, K. Oguri, Y. Okano, and T. Nishikawa,
    Appl. Phys. A 101, 523-531 (2010).
  6. "γ-H2AX and Phosphorylated ATM Focus Formation in Cancer Cells after Laser Plasma X Irradiation,"
    K. Sato, M. Nishikino, Y. Okano, and H. Nishimura et al.,
    Radiation Research 174, 436-445 (2010).
  7. "X-ray polarization spectroscopy to study anisotropic velocity distribution of hot electrons produced by an ultra-high-intensity laser",
    Y. Inubushi, Y. Okano, D. Batani, and H. Nishimura et al.,
    Phys. Rev. E 81, 036410 (2010) .
  8. "Application of laser produced plasma Kalpha x-ray probe in radiation biology,"
    M. Nishikino, Y. Okano and H. Nishimura et al.,
    Rev. Sci. Instrum. 81, 026107 (2010).
  9. "Study of plasma heating induced by fast electrons,"
    A. Morace, D. Batani, Y. Okano, H. Nishimura et al.,
    Phys. Plasmas 16, 122701 (2009).
  10. "Dynamics of femtosecond laser ablation studied with time-resolved x-ray absorption fine structure imaging,"
    K. Oguri, Y. Okano, T. Nishikawa, and H. Nakano,
    Phys. Rev. B 79, 144106 (2009).
  11. "Dynamical Study of Femtosecond-Laser-Ablated Liquid-Aluminum Nanoparticles Using Spatiotemporally Resolved X-Ray-Absorption Fine-Structure Spectroscopy,"
    K. Oguri, Y. Okano, T. Nishikawa, and H. Nakano,
    Phys. Rev. Lett. 99, 165003 (2007).
  12. "Observation of femtosecond-laser-induced ablation plumes of aluminum using space- and time-resolved soft x-ray absorption spectroscopy,"
    Y. Okano, K. Oguri, T. Nishikawa, and H. Nakano,
    Appl. Phys. Lett. 89, 221502 (2006).
  13. "Soft x-ray imaging system for picosecond time-resolved absorption spectroscopy using a femtosecond-laser-plasma source,"
    Y. Okano, K. Oguri, T. Nishikawa, and H. Nakano,
    Rev. Sci. Instrum. 77, 046105 (2006).
  14. "Spatial distribution of soft x-ray line emissions from aluminum plasma excited by a pair of femtosecond laser pulses,"
    Y. Okano, K. Oguri, T. Nishikawa, and H. Nakano,
    J. Appl. Phys. 99, 063302 (2006).
  15. "Transient observation of extended x-ray absorption fine structure in laser-melted Si by using femtosecond laser-produced-plasma soft x ray,"
    K. Oguri, Y. Okano, T. Nishikawa, and H. Nakano,
    Appl. Phys. Lett. 87, 011503 (2005).
  16. "Dependence on laser intensity and pulse duration in proton acceleration by irradiation of ultrashort laser pulses on a Cu foil target,"
    Y. Oishi, Y. Okano, and K. Nemoto et al.,
    Phys. Plasmas \textbf{12}, 073102 (2005).
  17. "Electron imaging of charge-separated field on a copper film induced by femtosecond laser irradiation,"
    Y. Okano, Y. Hironaka, K. G. Nakamura, and K. Kondo,
    Appl. Phys. Lett. 86, 141501 (2005).
  18. "Enhanced generation of fast protons from a polymer-coated metal foil by a femtosecond intense laser field,"
    H. Kishimura, Y. Okano, and K. Nemoto,
    Appl. Phys. Lett. 85, 2736-2738 (2004).
  19. "Energy distribution of electrons ejected from a copper target in a femtosecond laser field of 10^17 W/cm^2,"
    Y. Okano, Y. Hironaka, K. G. Nakamura, K. Kondo, Y. Oishi, T. Nayuki, and K. Nemoto,
    J. Appl. Phys. 95, 2278-2282 (2004).
  20. "Time-resolved electron shadowgraphy for 300-ps laser ablation of a copper film,"
    Y. Okano, Y. Hironaka, K. G. Nakamura, and K. Kondo,
    Appl. Phys. Lett. 83, 1536-1538 (2003).
  21. "Proton and carbon ion acceleration by irradiation of 60-fs-laser pulse on copper tape,"
    T. Fujii, Y. Okano, K. G. Nakamura, and K. Kondo et al.,
    Appl. Phys. Lett. 83, 1524-1526 (2003).
  22. "Thin tape target driver for laser ion accelerator,"
    T. Nayuki, Y. Oishi, T. Fujii, K. Nemoto, T. Kayoiji, Y. Okano, Y. Hironaka, K. G. Nakamura, and K. Kondo,
    Rev. Sci. Instrum. 74, 3293-3296 (2003).
  23. "X-ray and fast ion generation from metal targets by femtosecond laser irradiation,"
    Y. Okano, H. Kishimura, Y. Hironaka, K. G. Nakamura, and K. Kondo,
    Appl. Surf. Sci. 197-198, 281-284 (2002).
  24. "Production of relativistic electrons by irradiation of 43-fs-laser pulses on copper film,"
    Y. Oishi, T. Nayuki, K. Nemoto, Y. Okano, Y. Hironaka, K. G. Nakamura, and K. Kondo,
    Appl. Phys. Lett. 79, 1234--1236 (2001).

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Books and Proceedings

  1. "Dynamics of Femtosecond Laser Ablation Plume Studied With Ultrafast X-ray Absorption Fine Structure Imaging", K. Oguri, Y. Okano, T. Nishikawa, and H. Nakano,
    in Proceedings of the INTERNATIONAL SYMPOSIUM ON HIGH POWER LASER ABLATION 2010, AIP Conf. Proc. 1278, (American Institute of Physics, New York, 2010) pp. 656-664.
  2. "X-ray polarization measurement for fast electrons in intense-laser-produced plasma under oblique incidence,"
    Y. Okano, D. Batani, and H. Nishimura et al.,
    J. Phys.: Conf. Ser. 112, 022101 (2008).
  3. Y Inubushi, Y. Okano, H. Nishimura, and D. Batani et al.,
    "Diagnostics of anisotropic hot electron velocity distribution using x-ray polarization spectroscopy,"
    J. Phys.: Conf. Ser. 112, 022104 (2008).
  4. "X-ray polarization measurement for fast electrons in intense-laser-produced plasma under oblique incidence,"
    H. Nishimura, Y. Inubushi, Y. Okano, and D. Batani,
    J. Phys.: Conf. Ser. 112, 022080 (2008).
  5. "X-ray polarization spectroscopy to study energy transport in ultra-high intensity laser produced plasmas,"
    T. Kawamura, Y. Okano, and H. Nishimura et al.,
    J. Phys.: Conf. Ser. 112, 022097 (2008).
  6. "Integral cross sections with magnetic sublevels of He-like ions by electron impact excitation for x-ray polarization spectroscopic analysis,"
    T. Kai, H. Nishimura, and Y. Okano et al.,
    J. Phys.: Conf. Ser. 112, 022104 (2008).
  7. "Space- and time-resolved soft x-ray absorption spectroscopy of aluminum plasma induced by femtosecond-laser ablation,"
    Y. Okano, K. Oguri, T. Nishikawa, and H. Nakano,
    J. Phys.: Conf. Ser. 59, 769-772 (2007).
  8. "Observation of ultrafast bond-length expansion at the initial stage of laser ablation by picosecond time-resolved EXAFS",
    K. Oguri, Y. Okano, T. Nishikawa, and H. Nakano,
    in Proceedings of the Joint Conference on Ultrafast Optics V and Applications of High Field and Shortwavelength Sources XI, Ultrafast Optics V, Optical Sciences 132 (Springer-Verlag, Berlin, 2007) pp. 173-180.
  9. "Femtosecond-laser-induced ablation of an aluminum target probed by space- and time-resolved soft x-ray absorption spectroscopy",
    Y. Okano, K. Oguri, T. Nishikawa, and H. Nakano,
    in Proceedings of the Joint Conference on Ultrafast Optics V and Applications of High Field and Shortwavelength Sources XI, Ultrafast Optics V, Optical Sciences 132 (Springer-Verlag, Berlin, 2007) pp. 165-171.
  10. "Picosecond time-resolved XAFS measurements using femtosecond laser-produced plasma x-rays as a probe,"
    H. Nakano, K. Oguri, Y. Okano, and T. Nishikawa,
    in Laser Optics 2006: Superintense Light Fields and Ultrafast Processes, Proceedings of SPIE Vol. 6614 (The Society of Photo-Optical Instrumentation Engineers, May 2007), 661409. [Invited]
  11. "Spatially resolved soft x-ray spectroscopy of femtosecond-laser-induced plasmas",
    Y. Okano, K. Oguri, T. Nishikawa, and H. Nakano,
    in Proceedings of the Photonics West 2005, edited by J. Neev, C. B. Schaffer, A. Ostendorf, S. Nolte, Proc. Soc. Photo-Opt. Instrum. Eng. 5714, 215-222 (2005).
  12. "Time-resolved electron imaging of femtosecond laser ablation,"
    Y. Okano, Y. Hironaka, K. Kondo, and K. G. Nakamura,
    in Proceedings of the Ultrafast Phenomena XIV, edited by T. Kobayashi, T. Okada, T. Kobayashi, K. A. Nelson, S. De Silvestri, Chemical Physics 79, (Springer-Verlag, Berlin, 2005) pp. 825-827.
  13. "High-energy protons emitted from a polymer-coated metal foil by 60-fs laser irradiation,"
    H. Kishimura, H. Morishita, Y. Okano, Y. Okano, Y. Hironaka, K. Kondo, K. G. Nakamura, Y. Oishi, and K. Nemoto,
    in Proceedings of the Ultrafast Phenomena XIV, edited by T. Kobayashi, T. Okada, T. Kobayashi, K. A. Nelson, S. De Silvestri, Chemical Physics 79, (Springer-Verlag, Berlin, 2005) pp. 222-224.
  14. "Fast electron and ion emission from metal targets in intense femtosecond laser fields,"
    Y. Okano, Y. Hironaka, K. G. Nakamura, K. Kondo, Y. Oishi, T. Nayuki, and K. Nemoto,
    in Proceedings of the Ultrafast Phenomena XIII, edited by R. D. Miller, M. M. Murnane, N. F. Scherer and A. M. Weiner, Chemical Physics 71, (Springer-Verlag, Berlin 2002), pp. 105-107.
  15. "Identification of Ions Generated by Ultrashort Laser Pulses using Thomson Spectrometer,"
    Y. Oishi, T. Nayuki, T. Fujii, K. Nemoto, T. Kayoiji, K. Horioka, Y. Okano, Y. Hironaka, K. G. Nakamura, and K. Kondo,
    in Proceedings of the Science of Super-Strong Field Interactions, edited by K. Nakajima and M. Deguchi, AIP Conf. Proc. 634, (American Institute of Physics, New York, 2002), pp. 317-322.
  16. "Fast Electron Production by Irradiation of Ultrashort Laser Pulses on Copper,"
    Y. Oishi, T. Nayuki, T. Fujii, K. Nemoto, T. Kayoiji, Y. Okano, Y. Hironaka, K. G. Nakamura, and K. Kondo,
    in Proceedings of the Science of Super-Strong Field Interactions}, edited by K. Nakajima and M. Deguchi, AIP Conf. Proc. 634, (American Institute of Physics, New York, 2002), pp. 311-316.
  17. "X-ray and charged particle emission from metal targets in femtosecond laser field of 10^17 W/cm^2,"
    Y. Okano, Y. Hironaka, K. G. Nakamura, and K. Kondo,
    in Proceedings of the Science of Super-Strong Field Interactions, edited by K. Nakajima and M. Deguchi, AIP Conf. Proc. 634, (American Institute of Physics, New York, 2002), pp. 254-259.
  18. "Hard X-ray Generation and Nonthermal Ion and Electron Emission by Femtosecond Laser Irradiation on the Metal,"
    Y. Hironaka, Y. Okano, K. G. Nakamura, K. Kondo, Y. Oishi, T. Nayuki, and K. Nemoto,
    in Proceedings of the Inertial Fusion Sciences and Applications 2001, edited by K. A. Tanaka, D. D. Meyerhofer, J. Meyer-ter-Vehn (Elsevier, Paris, 2002), pp. 942-945.

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