Coherence measurements of a transient 14.7-nm x-ray laser

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

doi:10.1117/12.504929

19 December 2003 Coherence measurements of a transient 14.7-nm x-ray laser

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

Author Affiliations +

Proceedings Volume 5197, Soft X-Ray Lasers and Applications V; (2003) https://doi.org/10.1117/12.504929
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

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.

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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, and Franck Delmotte "Coherence measurements of a transient 14.7-nm x-ray laser", Proc. SPIE 5197, Soft X-Ray Lasers and Applications V, (19 December 2003); https://doi.org/10.1117/12.504929

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