Scaling study on lithium-like X-ray laser pumped by pulse-train laser

We performed x-ray laser gain measurements for various wavelengths by changing lasant materials in the pulse-train laser pumped compact x-ray laser scheme. Wavelengths of laser lines have been extended utilizing the 3d-5f transition of Li-like Mg, Al and Si ions, whose wavelengths are 12.8 nm, 10.57 nm and 8.88 nm, respectively. Each gain coefficient was 2.8 cm(-1), 2.0 cm(-1) and 3.1 cm(-1), respectively. Two dimensional mapping of the gain were determined for Mg and Al plasmas viewed from each axis of the plasma column. Besides, a Z-scaling on pumping energy for Li-like 3d-5f transitions has been obtained.