Evidence of high gain pumped by recombination has been observed in the 5g-4ƒ transition at 11.1 nm in sodiumlike copper ions with use of a 20-J 2-ps Nd:glass laser system. The time- and space-integrated gain coefficient was 8.8 ± 1.4 cm-1, indicating a single-transit amplification of ~60 times. This experiment has shown that 2 ps is the optimum pulse duration to drive the sodiumlike copper recombination x-ray lasing at 11.1 nm.
© 1996 Optical Society of America
J. Zhang, E. E. Fill, Y. Li, D. Schlögl, J. Steingruber, M. Holden, G. J. Tallents, A. Demir, P. Zeitoun, C. Danson, P. A. Norreys, F. Walsh, M. H. Key, C. L. S. Lewis, and A. G. McPhee, "High-gain x-ray lasing at 11.1 nm in sodiumlike copper driven by a 20-J, 2-ps Nd:glass laser," Opt. Lett. 21, 1035-1037 (1996)