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

被引：37
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：
俄罗斯基础研究基金会; 欧洲研究理事会;
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.
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页数：10
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