XUV Emissions from Terawatt Femtosecond Laser Produced Plasma Columns in Gases

  • Peixiang Lu
  • Hidetoshi Nakano
  • Tadashi Nishikawa
  • Naoshi Uesugi
Conference paper

Abstract

Terawatt femtosecond laser pulses were focused into a gas cell to produce plasma columns in gases of N 2, O 2, and He. The axial xuv emission spectra that were generated are reported and analyzed. The xuv amplifications on transitions of NIII 3s(2 S) − 2p(2 P) at 45.2 nm and OIII 2p3s(3 P) − 2p 2(3 P) at 37.4 nm in low-charged nitrogen and oxygen ions were successfully demonstrated by a linearly-polarized 100-fs pump laser pulse of only 25 mJ. Strong axial xuv emission lines from a laser-produced plasma column in helium gas were also observed, however, no amplification was observed for the L α , line at 30.3 nm. High-order harmonics from a helium plasma column were also investigated with different pump energies under the defocusing condition for the laser beam.

Keywords

Lithium Recombination Helium Sapphire Kato 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Peixiang Lu
    • 1
  • Hidetoshi Nakano
    • 1
  • Tadashi Nishikawa
    • 1
  • Naoshi Uesugi
    • 1
  1. 1.NTT Basic Research LaboratoriesAtsugi, KanagawaJapan

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