Terawatt-scale optical half-cycle attosecond pulses.
Terawatt-scale optical half-cycle attosecond pulses.
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太瓦级光学半周期阿秒脉冲
DOI：
10.1038/s41598-018-21052-2
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发表时间：
2018-02-08
影响因子：
4.6
通讯作者：
Xu Z
中科院分区：
文献类型：
--
作者：
Xu J;Shen B;Zhang X;Shi Y;Ji L;Zhang L;Xu T;Wang W;Zhao X;Xu Z
持续时间为几十阿秒的极紫外（XUV）阿秒脉冲已经成功地应用于原子尺度上的超快电子动力学研究。但其微弱的强度限制了其在演示内壳层电子非线性响应方面的进一步应用。光学阿秒脉冲将提供足够的光子通量来启动强场过程。本文提出了一种利用相对论多周期激光脉冲与设计的气膜靶相互作用产生超强孤立阿秒光脉冲的新方法。欠密气体靶使多周期激光脉冲变尖，产生厚度为几百纳米的相对论电子致密层。当稠密电子层通过倾斜的金属箔时，会在可见光和紫外光范围内发射出单个的超强半周期阿秒脉冲。所发射的脉冲具有超过1018W/cm 2的峰值强度和200as的半高全宽持续时间。这种阿秒光源的峰值功率达到2太瓦。该方法放宽了孤立阿秒脉冲产生对驱动脉冲的单周期要求，并显著提高了峰值功率，从而为追踪内壳层电子非线性响应以及研究非线性阿秒现象开辟了新的实验途径.
Extreme-ultravoilet (XUV) attosecond pulses with durations of a few tens of attosecond have been successfully applied for exploring ultrafast electron dynamics at the atomic scale. But their weak intensities limit the further application in demonstrating nonlinear responses of inner-shell electrons. Optical attosecond pulses will provide sufficient photon flux to initiate strong-field processes. Here we proposed a novel method to generate an ultra-intense isolated optical attosecond pulse through relativistic multi-cycle laser pulse interacting with a designed gas-foil target. The underdense gas target sharpens the multi-cycle laser pulse, producing a dense layer of relativistic electrons with a thickness of a few hundred nanometers. When the dense electron layer passes through an oblique foil, it emits single ultra-intense half-cycle attosecond pulse in the visible and ultraviolet spectral range. The emitted pulse has a peak intensity exceeding 1018 W/cm2 and full-width-half-maximum duration of 200 as. The peak power of this attosecond light source reaches 2 terawatt. The proposed method relaxes the single-cycle requirement on the driving pulse for isolated attosecond pulse generation and significantly boosts the peak power, thus it may open up the route to new experiments tracking the nonlinear response of inner-shell electrons as well as nonlinear attosecond phenomena investigation.
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影响因子：
8.6
作者：
Osterhoff, J.;Popp, A.;Karsch, S.
通讯作者：
Karsch, S.
超薄电子层加速。
影响因子：
1.8
作者：
Wen, M.;Wu, H. -C.;Shen, B.
通讯作者：
Shen, B.
影响因子：
1.8
作者：
Meyer-ter-Vehn, J.;Wu, H. -C.
通讯作者：
Wu, H. -C.
影响因子：
8.6
作者：
Wu, H. -C.;Meyer-ter-Vehn, J.;Hegelich, B. M.
通讯作者：
Hegelich, B. M.
影响因子：
8.6
作者：
Gaarde, Mette B.;Couairon, Arnaud
通讯作者：
Couairon, Arnaud