Origin of ellipticity of high-order harmonics generated by a two-color laser field in the cross-polarized configuration

被引：34

作者：

Stremoukhov, S. ^{[1
,2
]}

Andreev, A. ^{[1
]}

Vodungbo, B. ^{[3
,4
,5
]}

Salieres, P. ^{[6
]}

Mahieu, B. ^{[3
]}

Lambert, G. ^{[3
]}

机构：

[1] Lomonosov Moscow State Univ, Fac Phys, Leninskie Gory 1,Bldg 2, Moscow 119991, Russia

[2] Natl Res Ctr, Kurchatov Inst, 1 Akad Kurchatova Pl, Moscow 123182, Russia

[3] Univ Paris Saclay, Ecole Polytech, ENSTA ParisTech, LOA,CNRS, 828 Blvd Marechaux, F-91762 Palaiseau, France

[4] Univ Paris 06, Sorbonne Univ, LCPMR, UMR 7614, F-75005 Paris, France

[5] LCPMR, CNRS, UMR 7614, F-75005 Paris, France

[6] CEA Saclay, IRAMIS LIDyL, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW A | 2016年 / 94卷 / 01期

基金：

欧洲研究理事会; 俄罗斯基础研究基金会;

关键词：

MULTIPHOTON IONIZATION; EMISSION; SPECTRUM; PULSES; GASES; LIGHT;

D O I：

10.1103/PhysRevA.94.013855

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Recently several techniques demonstrated the production of elliptically polarized high harmonics. One of these techniques consists of the interaction in a noble gas of two-color laser beams having orthogonal linear polarizations. Here we present the theoretical explanation of such a result observed in Lambert et al. [Nat. Commun. 6, 6167 (2015)]. Numerical calculations based on the nonperturbative light-atom interaction theory reproduce well the experimental data. The degree of polarization is analyzed for different harmonic orders and found to be high. With the help of a simplified theoretical model it is shown that the degree of harmonic ellipticity depends mainly on the population of atomic state sublevels with different angular momentum projections.

引用

页数：10

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