Abstract
We report on the experimental demonstration of saturated X-ray lasing on the 4d→4p, J=0–1 line of nickel-like barium (Ba, Z=56) at a wavelength of 9.2nm, using a main pulse energy of 9J in a 1.5-ps duration pulse from a Nd:glass chirped-pulse amplification laser. Gain saturation was achieved by applying a triple-pulse scheme in which a weak (few-percent) prepulse, preceding the main pulse by 2.4ns, is followed by a second, relatively intense (16%) prepulse ~50ps before the main pulse. For handling convenience, compound targets of BaF2 were used, either in the form of windows or coated onto glass slides.
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