Using the third state of matter: high harmonic generation from liquid targets
Using the third state of matter: high harmonic generation from liquid targets
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DOI：
10.1088/1367-2630/16/11/113045
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发表时间：
2014-11-20
影响因子：
3.3
通讯作者：
Tsakiris, G. D.
中科院分区：
文献类型：
--
作者：
Heissler, P.;Lugovoy, E.;Tsakiris, G. D.
固体和气体靶上的高次谐波产生已被证明是产生阿秒脉冲的强大平台。在这里，我们展示了一种新的技术，在真空中的光滑液体表面的目标上产生的XUV，它避免了与固体目标相关的低重复率和有限的拍摄数量的问题，同时它保持了一些优点。我们采用原子级光滑，连续的液体射流的水，盐水溶液和乙醇，允许不间断的高谐波产生由于相干尾流发射机制超过8小时。已经发现，等离子体产生的机制是非常相似的光滑的固体靶表面。已经发现在我们的装置中液体目标周围的蒸气压非常低，使得可以忽略液体射流周围的气相的存在。
High harmonic generation on solid and gaseous targets has been proven to be a powerful platform for the generation of attosecond pulses. Here we demonstrate a novel technique for the XUV generation on a smooth liquid surface target in vacuum, which circumvents the problem of low repetition rate and limited shot numbers associated with solid targets, while it maintains some of its merits. We employed atomically smooth, continuous liquid jets of water, aqueous salt solutions and ethanol that allow uninterrupted high harmonic generation due to the coherent wake emission mechanism for over 8 h. It has been found that the mechanism of plasma generation is very similar to that for smooth solid target surfaces. The vapor pressure around the liquid target in our setup has been found to be very low such that the presence of the gas phase around the liquid jet could be neglected.