Zz. Xu et al., SPACE-RESOLVED AND TIME-RESOLVED INVESTIGATION OF SHORT-WAVELENGTH X-RAY LASER IN LI-LIKE CA IONS, Applied physics letters, 63(8), 1993, pp. 1023-1025
We have demonstrated the soft x-ray amplification for lithium-like Ca-
17+ 4f-3d transition at 57.7 angstrom with 900 ps, 1.05 mum drive lase
r pulse. The spatial distribution of the gain coefficient and temporal
history of the lasing line emissions were also obtained.