Observation of high transient gain in the germanium x-ray laser at 196 nm

• DOI: 10.1364/josab.15.001808
• Publication Date: 2008-03-20T18:53:25Z
• Authors: P. J. Warwick; C. L. S. Lewis; M. P. Kalachnikov; P. V. Nickles; M. Schnürer; A. Behjat; A. Demir; G. J. Tallents; D. Neely; E. Wolfrum; J. Zhang; G. J. Pert
• Keywords: Nanosecond; Transient (computer programming); Picosecond

The transient-excitation pumping scheme, in which a picosecond duration pulse rapidly heats the plasma preformed by low-intensity nanosecond pulse, was used to pump Ne-like germanium, J=0–1 transition at 19.6 nm. A small-signal gain coefficient of 30 cm-1 measured for targets ⩽5 mm long.