High order harmonics from relativistic electron spikes

High order harmonics from relativistic electron spikes
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相对论电子尖峰的高次谐波

DOI:
10.1088/1367-2630/16/9/093003
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发表时间:
2014
影响因子:
3.3
通讯作者:
H. Ahmed et al.
H. Ahmed et al.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. S. Pirozhkov;M. Kando;T. Zh. Esirkepov;P. Gallegos;H. Ahmed et al.

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已经发现了相对论性高次谐波产生的新机制(Pirozhkov 2012 Phys. Rev. Lett. 108 135004)。数太瓦相对论辐照度(> 1018 W cm− 2)的飞秒(飞秒30- 50 fs)激光聚焦到气体射流靶中形成的低密度(几× 1019 cm− 3)等离子体,产生梳状光谱,具有数百个偶数和奇数谐波阶,达到360 eV的光子能量,包括“水窗”光谱范围。谐波由J-KAREN(KPSI,JAEA)和Astra Gemini(CLF,RAL,UK)激光器的线性或圆偏振脉冲产生。光子数的可缩放性已经用120 TW激光器证明,在120 eV下产生40μJ sr− 1/谐波。实验结果用粒子模拟和突变理论进行了解释。介绍了一种新的谐波产生机制,即在激光脉冲激发的尾波和弓形波的边界处产生尖锐的、结构稳定的、振荡的电子尖峰。在本文中,实验,模拟和模型提供了详细的描述和新的功能,包括数据获得的双通道光谱仪,谐波产生的圆偏振激光脉冲和角分布。
A new regime of relativistic high-order harmonic generation has been discovered (Pirozhkov 2012 Phys. Rev. Lett. 108 135004). Multi-terawatt relativistic-irradiance (> 1018 W cm− 2) femtosecond (∼ 30–50fs) lasers focused to underdense (few× 1019 cm− 3) plasma formed in gas jet targets produce comb-like spectra with hundreds of even and odd harmonic orders reaching the photon energy of 360 eV, including the ‘water window’spectral range. Harmonics are generated either by linearly or circularly polarized pulses from the J-KAREN (KPSI, JAEA) and Astra Gemini (CLF, RAL, UK) lasers. The photon number scalability has been demonstrated with a 120TW laser, producing 40μJ sr− 1 per harmonic at 120 eV. The experimental results are explained using particle-in-cell simulations and catastrophe theory. A new mechanism of harmonic generation by sharp, structurally stable, oscillating electron spikes at the joint of the boundaries of the wake and bow waves excited by a laser pulse is introduced. In this paper, detailed descriptions of the experiments, simulations and model are provided and new features are shown, including data obtained with a twochannel spectrograph, harmonic generation by circularly polarized laser pulses and angular distribution.
聚焦气体射流目标的多太瓦飞秒激光器产生的高次谐波的精细光谱结构
DOI: 10.1109/cleopr.2013.6600032
发表时间: 2013
期刊: 2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR)
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发表时间: 2007-09-28
影响因子: 8.6
作者:
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