Unipolar terahertz pulse formation in a nonequilibrium plasma channel formed by an ultrashort uv laser pulse

被引：31

作者：

Bogatskaya, A., V ^{[1
,2
]}

Volkova, E. A. ^{[3
]}

Popov, A. M. ^{[1
,2
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia

[2] RAS, PN Lebedev Phys Inst, Moscow, Russia

[3] Moscow MV Lomonosov State Univ, DV Skobeltsyn Inst Nucl Phys, Moscow, Russia

来源：

PHYSICAL REVIEW E | 2021年 / 104卷 / 02期

关键词：

THZ-EMISSION; AMPLIFICATION; PROPAGATION; RADIATION; SUBCYCLE; GAS; AIR;

D O I：

10.1103/PhysRevE.104.025202

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：

We perform an alternative approach to produce highly unipolar terahertz pulses. The idea is based on the nonuniform amplification of seed ultrashort carrier-envelope phase (CEP) pulses in nonequilibrium fast relaxing plasma of air or nitrogen. If the gain coefficient drops significantly within the duration of a one-cycle CEP pulse, it undergoes significant distortion where the leading edge of the pulse is amplified and the trailing tail of opposite polarity is absorbed. The obtained results involve a self-consistent solution of the second-order wave equation and kinetic Boltzmann equation for the electron velocity distribution function relaxation.

引用

页数：7

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