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.
- 7.Shlyaptsev, V.N., et al.: Numerical study of transient and capillary x-ray lasers and their applications. In: Proc. 9th Int. Conf. X-Ray Lasers. IOP Conf. Ser., vol. 186, p. 325 (2005) Google Scholar
- 14.Staub, F., et al.: Line-focus generation for X-ray laser pumping. In: Sebban, S., et al. (eds.) X-Ray Lasers 2012. Springer Proceedings in Physics, vol. 147. Springer, Cham (2013). Chapter 38 in this book Google Scholar