The propagation of a strong x-ray pulse followed by pulse slowdown and compression, amplified spontaneous emission and lasing without inversion
2009 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 42, no 20Article in journal (Refereed) Published
We study self-seeded stimulated resonant x-ray Raman scattering and show a 20-fold compression of the strong XFEL pulse propagating through the resonant medium of atomic argon with the frequency (244.3 eV) tuned to the 2p(3/2)-4s resonance. The strong x-ray pulse inverts the medium and produces an extensive ringing tail which widens the power spectrum. Newly created seed field triggers the Stokes channel 3s-2p(3/2) of amplified spontaneous emission. The population inversions are quenched for longer propagation distances where lasing without inversion enhances the Stokes component. The pump pulse also generates weaker Stokes and anti-Stokes fields caused by four-wave mixing. The group velocity is decreased up to 78% of the speed of light in vacuum.
Place, publisher, year, edition, pages
2009. Vol. 42, no 20
IdentifiersURN: urn:nbn:se:kth:diva-18871DOI: 10.1088/0953-4075/42/20/201001ISI: 000270855200001ScopusID: 2-s2.0-70350646579OAI: oai:DiVA.org:kth-18871DiVA: diva2:336918
QC 201005252010-08-052010-08-052011-01-17Bibliographically approved