High-average-power, 100-Hz-repetition-rate, tabletop soft-x-ray lasers at sub-15-nm wavelengths
High-average-power, 100-Hz-repetition-rate, tabletop soft-x-ray lasers at sub-15-nm wavelengths
复制标题
亚 15 nm 波长的高平均功率、100 Hz 重复率、桌面软 X 射线激光器
DOI：
10.1103/physreva.89.053820
复制
发表时间：
2014
影响因子：
2.9
通讯作者：
J. Rocca
中科院分区：
文献类型：
--
作者：
B. Reagan;M. Berrill;K. Wernsing;C. Baumgarten;M. Woolston;J. Rocca
使用定制的泵浦脉冲轮廓以 100 Hz 重复率有效激发密集等离子体柱，从类镍银和类镍锡的跃迁中分别产生了 0.1 mW（在 = 13.9 nm 处）和 20 W（在 = 11.9 nm 处）的桌面软 X 射线激光平均功率。使用来自紧凑型二极管泵浦啁啾脉冲放大 Yb:YAG 激光器、持续时间为 5 ps 的 0.9-J 泵浦脉冲，还获得了波长在 10.9 至 14.7 nm 之间的其他几个跃迁的激光。流体动力学和原子等离子体模拟表明，泵浦脉冲轮廓由纳秒斜坡和两个皮秒持续时间的峰值组成，在峰值温度时产生类镍离子密度增加的等离子体，从而在时间和空间上扩大的空间上产生更大的增益系数，从而导致软x射线激光输出脉冲能量增加三倍。这些紧凑型软 X 射线激光器的高平均功率将使需要高光子通量的应用成为可能。这些结果为毫瓦平均功率桌面软 X 射线激光器开辟了道路。
Efficient excitation of dense plasma columns at 100-Hz repetition rate using a tailored pump pulse profile produced a tabletop soft-x-ray laser average power of 0.1 mW at = 13.9 nm and 20 W at = 11.9 nm from transitions of Ni-like Ag and Ni-like Sn, respectively. Lasing on several other transitions with wavelengths between 10.9 and 14.7 nm was also obtained using 0.9-J pump pulses of 5-ps duration from a compact diode-pumped chirped pulse amplification Yb:YAG laser. Hydrodynamic and atomic plasma simulations show that the pump pulse profile, consisting of a nanosecond ramp followed by two peaks of picosecond duration, creates a plasma with an increased density of Ni-like ions at the time of peak temperature that results in a larger gain coefficient over a temporally and spatially enlarged space leading to a threefold increase in the soft-x-ray laser output pulse energy. The high average power of these compact soft-x-ray lasers will enable applications requiring high photon flux. These results open the path to milliwatt-average-power tabletop soft-x-ray lasers.