Experimental study of the temporal coherence and spectral profile of the 13.9nm transient X-ray laser

Annie Klisnick (1) , Olivier Guilbaud (1) , David Ros (1) , Kevin Cassou (1) , Sophie Kazamias (1) , Gérard Jamelot (1) , J.C. Lagron (1) , Denis Joyeux (2) , Daniel Phalippou (2) , Y. Lechantre (3) , P. Mistry (3) , G.J Tallents (3)

1 LIXAM - Laboratoire d'interaction du rayonnement X avec la matière
2 Laboratoire Charles Fabry de l'Institut d'Optique / Scop
3 Department of Physics

A new Fresnel interferometer is used to investigate the temporal coherence of the 13.9 nm Ni-like Ag X-ray laser. The results obtained show a coherence time of ≈ 3 ps, corresponding to a spectral linewidth A2 of 0.7 mÅ, which is narrow. The pulse duration, also measured in this experiment, is shown to be close to the Fourier-transform limit. Finally, we discuss the implications of the high temporal coherence of the X-ray laser on the structure of the far-field pattern of the beam.

Domains: Physics [physics]; Physics [physics]; Optics [physics.optics]

Annie Klisnick, Olivier Guilbaud, David Ros, Kevin Cassou, Sophie Kazamias, et al.. Experimental study of the temporal coherence and spectral profile of the 13.9nm transient X-ray laser. Journal of Quantitative Spectroscopy and Radiative Transfer, 2006, 99 (1-3), pp.370-380. ⟨hal-00575860⟩