Sub-10-nm Ni-like soft-x-ray lasers

F. Jia; F. Staub; J. E. Balmer

doi:10.1117/12.2023283

30 September 2013 Sub-10-nm Ni-like soft-x-ray lasers

F. Jia, F. Staub, J. E. Balmer

Proceedings Volume 8849, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications X; 884903 (2013) https://doi.org/10.1117/12.2023283
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

We report on recent progress achieved in X-ray laser research at the Institute of Applied Physics of the University of Bern. Using the existing 10-TW Nd:glass CPA (chirped-pulse amplification) laser system in the grazing-incidence pumping (GRIP) scheme, saturated or near-saturated soft-X-ray lasing has been obtained on the 4d→4p, J = 0-1 lines of barium (Ba, Z = 56), lanthanum (La, Z = 57), and samarium (Sm, Z = 62) at wavelengths down to 7.36 nm, with weak lasing observed at 6.85 nm in Sm. This was achieved with main pulse energies of ~10 J at a pulse duration of 1.5 ps. A small-signal gain coefficient of ~30 cm^-1 and a gain-length product of ~16 at saturation have been measured in the case of the 9.2-nm Ba laser. Crucial to these results was the introduction of a second, relatively intense (~20%) prepulse less than 50 ps before the main pulse, in addition to the 2.8% prepulse that irradiated the target ~3 ns earlier. Travelling-wave excitation was used throughout.

Citation Download Citation

F. Jia, F. Staub, and J. E. Balmer "Sub-10-nm Ni-like soft-x-ray lasers", Proc. SPIE 8849, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications X, 884903 (30 September 2013); https://doi.org/10.1117/12.2023283

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