High-quality high-order harmonic generation through preplasma truncation

被引：11

作者：

Li, B. Y. ^{[1
,2
]}

Liu, F. ^{[1
,2
]}

Chen, M. ^{[1
,2
]}

Chen, Z. Y. ^{[3
]}

Yuan, X. H. ^{[1
,2
]}

Weng, S. M. ^{[1
,2
]}

Jin, T. ^{[4
]}

Rykovanov, S. G. ^{[5
]}

Wang, J. W. ^{[6
]}

Sheng, Z. M. ^{[1
,2
,7
,8
]}

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

机构：

[1] Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Laser Plasmas MoE, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, Collaborat Innovat Ctr IFSA, Shanghai 200240, Peoples R China

[3] China Acad Engn Phys, Inst Fluid Phys, Natl Key Lab Shock Wave & Detonat Phys, Mianyang 621999, Sichuan, Peoples R China

[4] Shanghai Jiao Tong Univ, Zhiyuan Coll, Shanghai 200240, Peoples R China

[5] Skolkovo Inst Sci & Technol, Ctr Computat & Data Intens Sci & Engn, Moscow 121205, Russia

[6] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai 201800, Peoples R China

[7] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China

[8] Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 ONG, Lanark, Scotland

来源：

PHYSICAL REVIEW E | 2019年 / 100卷 / 05期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

LASER; INTENSE; BURSTS; DRIVEN; LIGHT; PULSE;

D O I：

10.1103/PhysRevE.100.053207

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

By introducing preplasma truncation to cases with an initial preplasma scale length larger than 0.2 lambda, the efficiency of high-order harmonics generated from relativistic laser-solid interactions can be enhanced by more than one order of magnitude and the angular spread can be confined into near-diffraction-limited divergence. Numerical simulations show that density truncation results in more compact oscillation of the surface electron sheet and the curvature of the reflection surface for the driving laser is greatly reduced. This leads to an overall improvement in the harmonic beam quality. More importantly, density truncation makes the harmonic generation weakly dependent on the preplasma scale length, which provides a way to relax the extremely high requirement on the temporal contrast of the driving laser pulse. A feasible scheme to realize the required preplasma truncation is also proposed and demonstrated by numerical simulations.

引用

页数：8

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