Slowdown and compression of a strong X-ray free-electron pulse propagating through the Mg vapors
2009 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 87, no 6Article in journal (Refereed) Published
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 2p(3/2)-4s resonance (54.8 eV). The extensive ringing tail produced during propagation widens the power spectrum. This seed field triggers the Stokes channel 3s-2p(3/2) (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.
Place, publisher, year, edition, pages
2009. Vol. 87, no 6
IdentifiersURN: urn:nbn:se:kth:diva-18854DOI: 10.1209/0295-5075/87/64002ISI: 000270659600014ScopusID: 2-s2.0-78650936875OAI: oai:DiVA.org:kth-18854DiVA: diva2:336901
QC 201005252010-08-052010-08-052011-04-26Bibliographically approved