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1997 Fiscal Year Final Research Report Summary

Study on an efficient keV X-ray laser from a cluster target pumped by a table-top high-power laser

Research Project

Project/Area Number 08405009
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied optics/Quantum optical engineering
Research InstitutionUniversity of Tsukuba

Principal Investigator

KONDO Kiminori  University of Tsukuba.Institute of Material Science.Assistant Professor, 物質工学系, 講師 (80225614)

Co-Investigator(Kenkyū-buntansha) BHUSHAN Lalit sharma  University of Tsukuba.Institute of Material Science.Research Associate, 物質工学系, 助手 (80292530)
Project Period (FY) 1996 – 1997
Keywordsmultiphotn innershell excitation / relativistic self-channeling / keV X-ray generation / wavelength dependence / Xe cluster / Ti : sapphire laser / charge-displacement / critical power
Research Abstract

In the soft x-ray region, x-ray lasers have been already succeeded in the oscillation. However, in the hard x-ray region (the keV region), it is not. For having an oscillation in the keV X-ray laser. the efficient pumping method has to be developed. Then we studied on the new x-ray laser scheme, in which the population inversion in the keV X-ray region is excited by the multiphoton innershell excitation process. A relativistic and charge-displacement sell-channeling is also studied for making the gain length long with keeping the intense optical field of 10^<18> W/cm^2.
For the multiphoton innershell excitation, the wavelength dependence of M- and L-shell emission from Xe cluster target has been studied. KeV X-ray spectra have been measured with using a TW Ti : sapphire laser. By comparing with the results with a KrF laser, the conversion efficiencies from a laser light to X-rays are proved to be small. In M-shell emission, the conversion efficiency in Ti : sapphire was -10^<-2> times smaller than that in KrF, and in L-shell -1O^<-3> times. These results are thought to be very important for the development of the keV X-ray laser.
For the study on the relativistic and charge-displacement laser channeling, we measured the time-resolved backlighted image of the propagation of the TW Ti : sappghire laser pulse. In order to drive the self-channeling, the injected laser power must be larger than a critical power which strongly depends on the plasma density. From the results of our measurement, it was proved that, in Xe cluster target, the relativistic and charge displacement self-channeling seemed to happen, when the target gas density becomes high enough.

  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] K.Kondo et.al.: "Tunneling ionization and havmonicgeneration in two-color field" J.Opt.Soc.Am.B. 13. 424-429 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kobayashi et.al.: "Femtosecond measurement of high-order harmonic pulse width and electron recombination time by field ionization" Opt.Lett.21. 417-419 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] F.Hosoi et.al.: "High-power dye laser using steady-state amplification with chirped pulses" Appl.Opt.35. 1404-1408 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Itatani et.al.: "Generation of 13TW,26-fs pulses in a Ti:sapphire laser" Opt.Comm.134. 134-138 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kondo et.al.: "Wavelength dependence of multiphoton-induced Xe(M)and Xe(L) emissions from Xe clusters" J.Phys.B. 30. 2707-2716 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Sagisaka et.al.: "Ionization via an ultrashort high-power KrF laser" Appl.Phys.B. 65. 475-480 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.McPhersom et.al.: "Competition between multiphoton xean excitation and plasina wave Raman scattering at 248nm" J.Phys.B. 29. L291-L297 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Boyer et.al.: "Biomedical three-dimensional holographic microimaging at visible,ultraviolet and X-ray wave lengths" Nature Medichine. 2. 939-941 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.B.Borisov et.al.: "Intensity Dependence of the Multiphoton-Induced Xe(L)Spectrum Produced by Subpicasecond 248nm Excitation of Xe Clustus" J.Phys.B. 29. L43-L50 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.B.Borisov et.al.: "Ζ-λ Imaging of Xe(M) and Xe(L) Emissions from Channeled Propagation of Intense Femto second 248nm Pulses in a Xe Cluster Target" J.Phys.B. 29. L113-L118 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.B.Borisov et.al.: "Dynamical Orbital Collapse Drives Super X-ray Emission" J.Phys.B. 29. 247-255 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.McPherson et.al.: "Evidence of Enhanced Multiphoton (248nm) Coupling from Single-Pulse Energy Measurements of Xe(L) Emission Induced from Xe Clusters" J.Phys.B. 30. L767-L775 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.McPherson et.al.: "Competition between multiphoton xeon excitation and plasma wave Raman scattering at 248 nm" J.Phys.B. 29. L291-L297 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Boyer et.al.: "Biomedical three-dimensional holographic microimaging at visible, ultraviolet and X-ray wavelength" Nature Medichine. 2. 939-941 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.B.Borisov et.al.: "Intensity Dependence of the Multiphoton-Induced Xe (L) Spectrum Produced by Subpicosecond 248 nm Excitation of Xe Clusters" J.Phys.B. 29. L46-L50 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.B.Borisov et.al.: "Z-lambda Imaging of Xe (M) and Xe (L) Emission from Channeled Propagation of Intense Femtosecond 248 nm Pulses in a Xe Cluster Target" J.Phys.B. 29. L113-L118 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.B.Borisov et.al.: "Dynamical Orbital Collapse Drives Super X-ray Emission" J.Phys.B. 29. 247-255 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.McPerson et.al.: "Evidence of Enhanced Multiphoton (248 nm) Coupling from Single-Pulse Energy measurement of Xe (L) Emission Induced from Xe Clusters" J.Phys.B. 30. L767-L775 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kondo et.al.: "Tunneling ionization and harmonic generation in two-color field" J.Opt.Soc.Am.B. 13. 424-429 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kobayashi et.al.: "Femtosecond measurement of high-order harmonic pulse width and electron recombination time by field ionization" Opt.Lett.21. 417-419 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] F.Hosoi et.al.: "High-power dye laser using steady-state amplification with chirped pulses" Appl.Opt.35. 1404-1408 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Itatani et.al.: "Generation of 13TW,26-fs pulses in a Ti : sapphire laser" Opt.Comm.134. 134-138 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kondo et.al.: "Wavelength dependence of multiphoton-induced Xe (M) and XE (L) emissions from Xe cluster" J.Phys.B. 30. 2707-2716 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Sagisaka et.al.: "Ionization via an ultrashort high-power KrF laser" Appl.Phys.B. 65. 475-480 (1997)

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

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Published: 1999-12-08  

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