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VOLUME 67 (1998) | ISSUE 10 | PAGE 771
Hot-electron-pumped K-shell X-ray laser
PACS: 32.80.Hd, 34.50.Bw, 42.55.Vc, 52.40.Nk
Amplified spontaneous inner shell emission produced via an ultrafast burst of high energy electrons from a femtosecond laser-produced plasma is proposed as a novel electron-pumped x-ray laser. In this scheme, a population inversion of the upper-laser level is created via impact ionization of atomic inner shells by electron bombardment. Based on the requirement of a positive gain coefficient for amplifying spontaneous К-a line emission, a simple pumping threshold is found for the incident electron flux and assessments are made of the feasibility of the scheme for a range of lowΖ elements.