J. Phys. IV France 11 (2001) Pr2-137-Pr2-141
Saturated X-ray lasing in nickel-like Sn at 12 nmJ.E. Balmer, M. Braud and F. Loewenthal
Institute of Applied Physics, University of Berne, Sidlerstr. 5, 3012 Berne, Switzerland
We report on the experimental demonstration of gain saturation on the [MATH], J = 0-1 transition in Ni-like Sn at 12.0 nm using a drive power of 280 GW in a 100-ps pulse. A 0.5% ("twin-0.25%") prepulse irradiated the flat slab targets 5 ns before the main pulse. The gain coefficient was measured to be 13.5 cm-1, and the gain-length product required for saturation was ~17. At a distance of 1.3 m from the target, the x-ray laser was recorded as an elliptically shaped spot with major and minor axes dimensions of 4.0 and 1.7 mm (FWHM), giving a beam divergence of 3.7 and 1.3 mrad in the directions parallel and perpendicular to the target surface, respectively.
© EDP Sciences 2001