We report observations of amplified spontaneous emission at soft x-ray wavelengths. An optical laser ionized thin foils of selenium to produce a population inversion of the 2p⁵3p and 2p⁵3s levels of the neonlike ion. Using three time-resolved, spectroscopic measurements we demonstrated gain-length products up to 6.5 and gain coefficients of 5.5±{}1.0 cm^-1 for the J=2 to 1 lines at 206.3 and 209.6 {}. We also observed considerable amplification for the same transitions in yttrium at 155.0 and 157.1 {}.
No takes yet. Share an insight, caveat, or question.
Matthews et al. (1985) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: