Volume 87, Number 6, September 2009
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||02 October 2009|
Slowdown and compression of a strong X-ray free-electron pulse propagating through the Mg vapors
Theoretical Chemistry, Royal Institute of Technology - Roslagstullsbacken 15, S-106 91 Stockholm, Sweden, EU
2 College of Physics and Electronics, Shandong Normal University - 250014 Jinan, China
Corresponding author: firstname.lastname@example.org
Accepted: 9 September 2009
Here we study the propagation of a strong X-ray free-electron pulse through the resonant medium of atomic Mg accompanied by the self-seeded stimulated resonant X-ray Raman scattering. The X-ray pulse is decelerated by two orders of magnitude because of nonlinear interaction and experiences a 6-fold compression. The simulations are based on a strict numerical solution of the coupled Bloch and Maxwell equations for a 50 fs pulse tuned in the - resonance (54.8 eV). The extensive ringing tail produced during propagation widens the power spectrum. This seed field triggers the Stokes channel - (49.4 eV) of stimulated resonant X-ray Raman scattering and the weaker Stokes and anti-Stokes fields caused by four-wave mixing. The beating between the Stokes and pump fields quenches the population inversion at longer propagation distances where lasing without inversion enhances the Stokes component.
PACS: 42.65.Re – Ultrafast processes; optical pulse generation and pulse compression / 32.80.Aa – Inner-shell excitation and ionization / 41.60.Cr – Free-electron lasers
© EPLA, 2009
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