Efficient Kα x-ray source from submillijoule femtosecond laser pulses operated at kilohertz repetition rate
Efficient Kα x-ray source from submillijoule femtosecond laser pulses operated at kilohertz repetition rate
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DOI：
10.1063/1.2789676
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发表时间：
2007-10-01
影响因子：
1.6
通讯作者：
Fedosejevs, R.
中科院分区：
文献类型：
--
作者：
Serbanescu, C. G.;Chakera, J. A.;Fedosejevs, R.
我们报告了一个有效的铜K-α X射线源产生的聚焦亚毫焦耳，120 fs的钛：蓝宝石激光脉冲在固体铜靶上的光斑直径为几微米。实验结果表明，强的K-α X射线发射的固体靶从微等离子体中产生的p偏振的0.2-0.3毫焦耳的激光脉冲在1千赫的重复率。我们已经证明了K-α X射线点源发射率为6.7 × 10（9）光子/秒，以1 kHz的重复率进入2 π sr。该源具有3.2 X 10（-5）的X射线到Cu K-α线发射的转换效率。源的测量尺寸为-8 μ m。这种高重复率的K-α X射线源对于时间分辨的X射线衍射和射线照相应用非常有用。(C)2007年，美国物理学会。
We report an efficient Cu K-alpha x-ray source produced by focusing submillijoule, 120 fs Ti:sapphire laser pulses on a solid copper target to a spot diameter of few microns. The experimental results show strong emission of K-alpha x-rays from solid targets from microplasmas created by p-polarized 0.2-0.3 mJ laser pulses at 1 kHz repetition rate. We have demonstrated K-alpha x-ray point source emission rates of 6.7 x 10(9) photons/s into 2 pi sr at 1 kHz repetition rate. The source has an x-ray conversion efficiency into Cu K-alpha line emission of 3.2 x 10(-5). The source has a measured size of -8 mu m. Such a high repetition rate K-alpha x-ray source can be very useful for time resolved x-ray diffraction and radiographic applications. (C) 2007 American Institute of Physics.