Demonstration of soft x-ray amplification in nickel-like ions

B. J. MacGowan, S. Maxon, P. L. Hagelstein, C. J. Keane, R. A. London, Dennis L Matthews, M. D. Rosen, J. H. Scofield, D. A. Whelan

Research output: Contribution to journalArticlepeer-review

151 Scopus citations


We report the first observation of amplification of spontaneous emission at soft x-ray wavelengths by ions in the nickel-like sequence. The ions are created by high-intensity laser irradiation of a thin foil. Gains of order 1 cm-1 are observed on J=0-1, 4d-4p transitions in Eu35+ at 65.83 and 71.00 AI. There is some evidence for amplification on the analogous lines at 50.26 and 56.09 AI in Yb42+. The pumping mechanism is believed to be electron collisional excitation from the ground state. The scheme should be readily scalable to produce amplification in W46+ at 43.15 AI.

Original languageEnglish (US)
Pages (from-to)2157-2160
Number of pages4
JournalPhysical Review Letters
Issue number19
StatePublished - 1987
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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