Characterization of the collisionally pumped optical-field-ionized soft-x-ray laser at 41.8 nm driven in capillary tubes
Characterization of the collisionally pumped optical-field-ionized soft-x-ray laser at 41.8 nm driven in capillary tubes
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DOI：
10.1103/physreva.73.033801
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发表时间：
2006-03-01
影响因子：
2.9
通讯作者：
Maynard, G
中科院分区：
文献类型：
--
作者：
Cros, B;Mocek, T;Maynard, G
本文报道了在光滑毛细管中驱动的41.8nm碰撞泵浦光场电离软X射线激光（SXRL）的实验和理论研究。已经进行了详细的实验研究，以了解在这种配置的指导相关的关键影响。放大等离子体内创建几厘米长的毛细管，并获得最大的极紫外线发射时，在多模引导制度与优化的激光信号从一个25毫米长的毛细管的一个因素为3高于一个气室，并与光束发散度减少了3倍。开发了一个计算等离子体源发射的SXRL信号的数值程序COFIXE。它包括泵浦光束传播的计算，确定与泵浦光束相互作用后的等离子体状态，在随后的几个ps期间的等离子体的局部性质的演变的计算，以及SXRL发射的放大和传输的计算。实验结果与理论计算结果吻合较好，如光束的发散度、泵浦光传输与超高速激光能量的相关性以及由引导引起的增强因子等。
We report on experimental and theoretical studies of a collisionally pumped, optical-field-ionized soft-x-ray laser (SXRL) at 41.8 nm driven in capillary tubes with smooth inner surface. A detailed experimental study has been conducted in order to understand the key effects related to guiding in this configuration. The amplifying plasma was created inside few-cm-long capillary tubes, and maximum extreme ultraviolet emission was obtained when operating in a multimode guiding regime with an optimized lasing signal from a 25-mm-long capillary a factor of 3 higher than that of a gas cell and with a beam divergence reduced by a factor of 3. A numerical code, named COFIXE, has been developed to calculate the SXRL signal emitted by the plasma source. It includes the calculation of the pump beam propagation, the determination of the plasma state just after the interaction with the pump beam, the calculation of the evolution of the local properties of the plasma during the subsequent few ps, and the calculation of the amplification and transport of the SXRL emission. Excellent agreement has been obtained between experiment and theory for several features such as the divergence of the beam, the correlation between guided pump beam transmission and SXRL energy, and the enhancement factor induced by guiding.