交叉偏振双色激光场产生的高次谐波椭圆性的起源

IF 2.6 2区物理与天体物理 Q2 OPTICS

Physical Review a Pub Date : 2016-07-29 DOI:10.1103/PHYSREVA.94.013855

S. Stremoukhov, A. Andreev, B. Vodungbo, P. Salières, B. Mahieu, G. Lambert

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引用次数: 30

摘要

最近有几种技术证明了椭圆极化高次谐波的产生。其中一种技术是利用具有正交线性偏振的双色激光束在惰性气体中的相互作用。在这里，我们提出了Lambert等人观察到的这种结果的理论解释[Nat. common . 6,6167(2015)]。基于非微扰光原子相互作用理论的数值计算较好地再现了实验数据。分析了不同谐波阶的极化度，发现极化度较高。借助于简化的理论模型，证明了调和椭圆度的大小主要取决于具有不同角动量投影的原子态亚能级的占比。

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

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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来源期刊

Physical Review a OPTICSPHYSICS, ATOMIC, MOLECULAR & CHEMICA-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.30

自引率

24.10%

发文量

2086

期刊介绍： Physical Review A (PRA) publishes important developments in the rapidly evolving areas of atomic, molecular, and optical (AMO) physics, quantum information, and related fundamental concepts. PRA covers atomic, molecular, and optical physics, foundations of quantum mechanics, and quantum information, including: -Fundamental concepts -Quantum information -Atomic and molecular structure and dynamics; high-precision measurement -Atomic and molecular collisions and interactions -Atomic and molecular processes in external fields, including interactions with strong fields and short pulses -Matter waves and collective properties of cold atoms and molecules -Quantum optics, physics of lasers, nonlinear optics, and classical optics