Influence of spatial-intensity contrast in ultraintense laser-plasma interactions.
Influence of spatial-intensity contrast in ultraintense laser-plasma interactions.
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DOI：
10.1038/s41598-022-05655-4
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发表时间：
2022-02-03
影响因子：
4.6
通讯作者：
McKenna P
中科院分区：
文献类型：
--
作者：
Wilson R;King M;Butler NMH;Carroll DC;Frazer TP;Duff MJ;Higginson A;Dance RJ;Jarrett J;Davidson ZE;Armstrong CD;Liu H;Hawkes SJ;Clarke RJ;Neely D;Gray RJ;McKenna P
提高高功率激光脉冲聚焦的强度开辟了新的研究可能性，包括有前途的粒子加速和高场量子电动力学等现象的新方法。虽然可以通过更紧密的聚焦来增加给定功率的激光脉冲可实现的强度，但焦斑轮廓在相互作用物理学中也起着重要作用。在这里，我们表明，空间强度分布，特别是在峰值的激光焦斑周围的光晕的强度比，是很重要的超强激光脉冲与固体目标的相互作用。通过比较近衍射极限波长尺度焦斑和大F数聚焦辐照下的质子加速测量结果，我们发现这种空间强度对比度参数强烈影响激光能量与快电子的耦合。我们发现，对于多拍瓦脉冲，空间强度对比度是潜在的时间强度对比度一样重要。
Increasing the intensity to which high power laser pulses are focused has opened up new research possibilities, including promising new approaches to particle acceleration and phenomena such as high field quantum electrodynamics. Whilst the intensity achievable with a laser pulse of a given power can be increased via tighter focusing, the focal spot profile also plays an important role in the interaction physics. Here we show that the spatial-intensity distribution, and specifically the ratio of the intensity in the peak of the laser focal spot to the halo surrounding it, is important in the interaction of ultraintense laser pulses with solid targets. By comparing proton acceleration measurements from foil targets irradiated with by a near-diffraction-limited wavelength scale focal spot and larger F-number focusing, we find that this spatial-intensity contrast parameter strongly influences laser energy coupling to fast electrons. We find that for multi-petawatt pulses, spatial-intensity contrast is potentially as important as temporal-intensity contrast.
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自生成的表面磁场抑制了高能质子的激光驱动的鞘加速度。
影响因子：
16.6
作者：
Nakatsutsumi M;Sentoku Y;Korzhimanov A;Chen SN;Buffechoux S;Kon A;Atherton B;Audebert P;Geissel M;Hurd L;Kimmel M;Rambo P;Schollmeier M;Schwarz J;Starodubtsev M;Gremillet L;Kodama R;Fuchs J
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影响因子：
1.6
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影响因子：
8.6
作者：
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Renard-LeGalloudec, N
影响因子：
19.6
作者：
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通讯作者：
Gruener, Florian
影响因子：
2.2
作者：
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通讯作者：
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