Nishikino Masaharu, Hasegawa Noboru, Kawachi Tetsuya, Yamatani Hiroshi, Sukegawa Kota, Nagashima Keisuke
X-ray Laser Group, Quantum Beam Science Directorate, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa, Kyoto 619-0215, Japan.
Appl Opt. 2008 Mar 10;47(8):1129-34. doi: 10.1364/ao.47.001129.
We have improved a highly coherent x-ray laser at 13.9 nm 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 3-4 mrad 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 approximately 1.3 microJ, corresponding to a large photon flux of 6.5 x 10(10) photons/pulse and a high peak brilliance of 5 x 10(26) photons/(s x mm(2) x mrad(2) x 0.01% bandwidth).
我们采用振荡器 - 放大器配置改进了一台波长为13.9纳米的高相干X射线激光器。为了改进高亮度X射线激光器，我们对放大器靶采用行波泵浦，并将放大器靶沿逆时针方向旋转3 - 4毫弧度。由此，种子X射线激光器可以通过具有高增益系数的放大器靶的中等等离子体进行放大。放大后的X射线激光器输出能量约为1.3微焦，对应于6.5×10¹⁰个光子/脉冲的大光子通量以及5×10²⁶个光子/(秒×平方毫米×毫弧度²×0.01%带宽)的高峰值亮度。
