Soft-X-Ray Lasing down to 6.85 nm in Ni-Like Samarium
We report on recent progress achieved in X-ray laser research at the Institute of Applied Physics of the University of Bern. Using the 10-TW Nd:glass CPA (chirped-pulse amplification) laser system and the grazing-incidence pumping (GRIP) scheme, intense soft-X-ray lasing has been obtained on the 4d → 4p, J=0–1 line of samarium (Sm, Z=62) at 7.36 nm, with weak lasing observed at 6.85 nm. This was achieved with main pulse energies of 10–12 J and a pulse duration of 1.5 ps. Crucial to these results was the introduction of a second, relatively intense (22.7 %) prepulse ∼30 ps before the main pulse, in addition to the 13.4 % prepulse incident on target several nanoseconds before the main pulse.
KeywordsPump Energy Main Pulse Optimum Density Line Focus Driver Laser
The authors would like to thank B. Locher for expert technical assistance and target preparation. This work was supported in part by the Swiss National Science Foundation. F. Staub was supported by the Swiss National Science Foundation under D. Bleiner’s Förderungsprofessur (grant PP00P2-133564/1).
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