Obtaining attosecond X-ray pulses using a self-amplified spontaneous emission free electron laser
Obtaining attosecond X-ray pulses using a self-amplified spontaneous emission free electron laser
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DOI：
10.1103/physrevstab.8.050704
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发表时间：
2005-01
影响因子：
--
通讯作者：
A. Zholents;G. Penn
中科院分区：
文献类型：
--
作者：
A. Zholents;G. Penn
We describe a technique for the generation of a solitary attosecond X-ray pulse in a free electron laser (FEL), via a process of self-amplified spontaneous emission. In this method, electrons experience an energy modulation upon interacting with laser pulses having a duration of a few cycles within single-period wiggler magnets. Two consecutive modulation sections, followed by compression in a dispersive section, are used to obtain a single, sub-femtosecond spike in the electron peak current. This region of the electron beam experiences an enhanced growth rate for FEL amplification. After propagation through a long undulator,this current spike emits a {approx}250 attosecond X-ray pulse whose intensity dominates the X-ray emission from the rest of the electron bunch.
