Optical field-ionization of a neutral gas with inhomogeneous density for electron acceleration by a high-intensity laser

被引：5

作者：

Gupta, Devki Nandan ^{[1
]}

Singh, Kunwar Pal ^{[2
]}

Suk, Hyyong ^{[3
,4
]}

机构：

[1] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India

[2] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia

[3] Gwangju Inst Sci & Technol, APRI, Kwangju 500712, South Korea

[4] Gwangju Inst Sci & Technol, Grad Program Photon & Appl Phys, Kwangju 500712, South Korea

来源：

PHYSICS OF PLASMAS | 2012年 / 19卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

IONIZING GASES; PLASMAS; HELIUM; VACUUM; PULSE;

D O I：

10.1063/1.3678202

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：

A scheme for the laser-induced acceleration of an electron from a double-ionizing neutral gas is investigated, where an inhomogeneous neutral gas profile (resembling a gas-jet experiment) is considered in order to observe the actual electron energy gain during acceleration. Optical-field ionization of the neutral gas can defocus the laser pulse significantly, and an electron accelerates by being pushed in front of a laser pulse in vacuum, and then decelerates due to the defocused (quite low-intensity) tail part of the laser pulse. The reduction in electron deceleration incurred by defocusing the laser-induced double-ionization of the neutral gas makes the electron acceleration continuous. In this study, we introduced an inhomogeneous gas profile that resembles a laser gas-jet experiment. However, the inhomogeneity of the gas reduced the rate of tunnel ionization, which limited the defocusing of the laser pulse; thus, though the electron energy gain is reduced but this proposal is more feasible and realistic. (C) 2012 American Institute of Physics. [doi:10.1063/1.3678202]

引用

页数：5

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