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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 24 — Nov. 21, 2011
  • pp: 24376–24386

Mid-infrared laser-driven broadband water-window supercontinuum generation from pre-excited medium

Yang Li, Weiyi Hong, Qingbin Zhang, Shaoyi Wang, and Peixiang Lu  »View Author Affiliations

Optics Express, Vol. 19, Issue 24, pp. 24376-24386 (2011)

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We theoretically investigate the broadband water-window supercontinuum generation from pre-excited medium with a mid-infrared pulse. We find that the wavelength scaling of the harmonic yield from near-visible (0.8 μm) to mid-infrared (1.8 μm) in single-atom level is λ−2.7. Using an intense phase-stabilized few-cycle 1.6 μm laser pulse, a broadband water window supercontinuum with bandwidth of approximately 140 eV is obtained. We also investigate the macroscopic effects and find that large initial population of the excited state leads to the high-density of free electrons, which shift the carrier-envelop phase of the driving pulse and further diminish the water-window supercontinuum generation. The highly-ionized medium also results in poor temporal and spatial properties of the attosecond pulse. Instead, small initial population of the excited state can produce well phase-matched xuv supercontinuum in water-window region and an 100-as pulse with central wavelength of 2.8 nm and pulse energy of 0.15 nJ can be filtered out.

© 2011 OSA

OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(300.6560) Spectroscopy : Spectroscopy, x-ray

ToC Category:
Nonlinear Optics

Original Manuscript: October 6, 2011
Revised Manuscript: October 27, 2011
Manuscript Accepted: November 3, 2011
Published: November 14, 2011

Yang Li, Weiyi Hong, Qingbin Zhang, Shaoyi Wang, and Peixiang Lu, "Mid-infrared laser-driven broadband water-window supercontinuum generation from pre-excited medium," Opt. Express 19, 24376-24386 (2011)

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