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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 6 — Mar. 17, 2008
  • pp: 3546–3559

X-ray lasers from Inner-shell transitions pumped by the Free-electron laser

J. Zhao, Q. L. Dong, S. J. Wang, L. Zhang, and J. Zhang  »View Author Affiliations

Optics Express, Vol. 16, Issue 6, pp. 3546-3559 (2008)

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We present a approach of generating femtosecond coherent x-ray pulses by using the self-amplified free-electron laser (SASE FEL) to pump the inner-shell x-ray lasers (ISXRL’s). Theoretical simulations are performed. The gain characteristics are analyzed for the two representative schemes of inner-shell x-ray transitions, ie. the self-terminated x-ray lasing (1s)-1→(2p)-1 (λ = 4.5nm) in carbon (Z=6) and the quasi-stationary x-ray lasing (2p)-1→(3s)-1 (λ = 4.1nm) in calcium (Z = 20). When the 10fs x-ray FEL pulses are available at 284eV and 360eV with the pumping intensities of 1.2×1015W/cm2 and 2×1017W/cm2 for C and Ca, respectively, a net gain of 140cm-1 can be predicted. Using a one-dimensional model, the properties of output ISXRL’s are studied. By the Carbon ISXRL scheme, the multi-spiky SASE FEL x-ray pulse with chaotic temporal structure is smoothed to a temporally continuous x-ray pulse with a comparable duration but at a different wavelength. The Calcium scheme, can be used to create one single x-ray laser pulse with a duration as short as 2fs. The spectral bandwidth of the output ISXRL’s is an order of 10-3, which is one order narrower than that of the SASE FEL’s.

© 2008 Optical Society of America

OCIS Codes
(140.2600) Lasers and laser optics : Free-electron lasers (FELs)
(140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
(260.5210) Physical optics : Photoionization
(260.6048) Physical optics : Soft x-rays

ToC Category:
Lasers and Laser Optics

Original Manuscript: November 6, 2007
Revised Manuscript: January 31, 2008
Manuscript Accepted: February 3, 2008
Published: March 3, 2008

J. Zhao, Q. L. Dong, S. J. Wang, L. Zhang, and J. Zhang, "X-ray lasers from Inner-shell transitions pumped by the Free-electron laser," Opt. Express 16, 3546-3559 (2008)

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