Abstract

We have improved a highly coherent x-ray laser at 13.9nm using an oscillator–amplifier configuration. To improve a high-brilliance x-ray laser, we adopted traveling wave pumping for the amplifier target and rotated the amplifier target 34mrad in the counterclockwise direction. Thereby, a seed x-ray laser can be amplified by medium plasma of the amplifier target with a high gain coefficient. The amplified x-ray laser has the output energy of 1.3μJ, corresponding to a large photon flux of 6.5×1010  photons/pulse and a high peak brilliance of 5×1026 photons/(smm2mrad20.01%  bandwidth).

© 2008 Optical Society of America

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