Ultra-bright XUV Emission from Laser Wakefields in Underdense Plasma

被引：0

作者：

Liu, Yue ^{[1
]}

Sheng, Z. M. ^{[1
,2
]}

Zheng, J. ^{[1
]}

Li, F. Y. ^{[1
]}

Xu, X. L. ^{[4
]}

Lu, W. ^{[4
]}

Mori, W. B. ^{[3
]}

Liu, C. S. ^{[5
]}

Zhang, J. ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Minist Educ, Key Lab Laser Plasmas, Shanghai 200240, Peoples R China

[2] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China

[3] Univ Calif Los Angeles, Dept Phys & Astron, Dept Elect Engn, Los Angeles, CA 90095 USA

[4] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

[5] Univ Maryland, East W Space Sci Ctr, College Pk, MD 20740 USA

来源：

ADVANCED ACCELERATOR CONCEPTS | 2012年 / 1507卷

基金：

美国国家科学基金会;

关键词：

XUV pulses; laser wakefields; plasma wave-breaking; PIC simulations; INTENSE; PULSES; BREMSSTRAHLUNG; ACCELERATION; ELECTRONS;

D O I：

10.1063/1.4773785

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

By use of particle-in-cell (PIC) simulation, we observe ultra-bright XUV radiation pules emerging from a laser wakefield driven above the wave-breaking thereshold in underdense plasma, which is as short as as few hundred attoseconds in one-dimentsional simulations and a few femtoseconds in two-dimensional simulations. It is concerned with the formation of a transverse narrow current layer co-moving with the intense laser pulse. This current layer is formed by an electron density spike with trapped electrons in the wakefield with certain transverse kinetic momentum of electrons left behind the laser pulse. This net momentum appears when the driving laser pulse undergoes strong self-modulation and subsequent pulse steepening at the front. In the multi-dimensional simulations, the XUV emission is found only near the laser axis with a much smaller spot size than the laser pulse due to the transverse dynamics of the trapped electrons. The present scheme provides an alternative method to produce ultra-bright XUV pulses for ultrafast applications.

引用

页码：711 / 716

页数：6

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