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Proceedings Paper

Coherence measurements of a transient 14.7-nm x-ray laser
Author(s): James Dunn; Raymond F. Smith; Sebastian Hubert; Marta Fajardo; Philippe Zeitoun; James R. Hunter; Christian Remond; Laurent Vanbostal; Sylvie Jacquemot; Joseph Nilsen; Ciaran L. S. Lewis; Remy Marmoret; Vyacheslav N. Shlyaptsev; Marie-Francoise Ravet; Franck Delmotte
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Paper Abstract

We present the longitudinal coherence measurement of the transient inversion collisional x-ray laser for the first time. The Ni-like Pd x-ray laser at 14.68 nm is generated by the LLNL COMET laser facility and is operating in the gain-saturated regime. Interference fringes are produced using a Michelson interferometer setup in which a thin multilayer-coated membrane is used as a beam splitter. The longitudinal coherence length for the picosecond duration 4d1S0 -> 4p1P1 lasing transition is determined to be ~400 µm (1/e HW) by adjusting the length of one interferometer arm and measuring the resultant variation in fringe visibility. This is four times improved coherence than previous measurements on quasi-steady state schemes largely as a result of the narrower line profile in the lower temperature plasma. The inferred gain-narrowed linewidth of ~0.29 pm is also substantially narrower than previous measurements on quasi-steady state x-ray laser schemes. This study shows that the coherence of the x-ray laser beam can be improved by changing the laser pumping conditions. The x-ray laser is operating at 4 - 5 times the transform-limited pulse.

Paper Details

Date Published: 19 December 2003
PDF: 8 pages
Proc. SPIE 5197, Soft X-Ray Lasers and Applications V, (19 December 2003); doi: 10.1117/12.504929
Show Author Affiliations
James Dunn, Lawrence Livermore National Lab. (United States)
Raymond F. Smith, Lawrence Livermore National Lab. (United States)
Sebastian Hubert, Commissariat a l'Energie Atomique (France)
Marta Fajardo, Univ. Paris-Sud (France)
Philippe Zeitoun, Univ. Paris-Sud (France)
James R. Hunter, Lawrence Livermore National Lab. (United States)
Christian Remond, Commissariat a l'Energie Atomique (France)
Laurent Vanbostal, Univ. Paris-Sud (France)
Sylvie Jacquemot, Commissariat a l'Energie Atomique (France)
Joseph Nilsen, Lawrence Livermore National Lab. (United States)
Ciaran L. S. Lewis, Queen's Univ. of Belfast (United Kingdom)
Remy Marmoret, Commissariat a l'Energie Atomique (France)
Vyacheslav N. Shlyaptsev, Univ. of California/Davis (United States)
Marie-Francoise Ravet, Univ. Paris-Sud (France)
Franck Delmotte, Univ. Paris-Sud (France)

Published in SPIE Proceedings Vol. 5197:
Soft X-Ray Lasers and Applications V
Ernst E. Fill; Szymon Suckewer, Editor(s)

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