利用正交双色激光场解析光电子动量分布中的周期内干涉

Disentangling Intracycle Interferences in Photoelectron Momentum Distributions Using Orthogonal Two-Color Laser Fields.

作者信息

Xie Xinhua, Wang Tian, Yu ShaoGang, Lai XuanYang, Roither Stefan, Kartashov Daniil, Baltuška Andrius, Liu XiaoJun, Staudte André, Kitzler Markus

机构信息

Photonics Institute, Technische Universität Wien, 1040 Vienna, Austria.

Joint Laboratory for Attosecond Science of the National Research Council and the University of Ottawa, Ottawa, Ontario K1A 0R6, Canada.

出版信息

Phys Rev Lett. 2017 Dec 15;119(24):243201. doi: 10.1103/PhysRevLett.119.243201. Epub 2017 Dec 11.

DOI:10.1103/PhysRevLett.119.243201

PMID:29286743

Abstract

We use orthogonally polarized two-color (OTC) laser pulses to separate quantum paths in the multiphoton ionization of Ar atoms. Our OTC pulses consist of 400 and 800 nm light at a relative intensity ratio of 10∶1. We find a hitherto unobserved interference in the photoelectron momentum distribution, which exhibits a strong dependence on the relative phase of the OTC pulse. Analysis of model calculations reveals that the interference is caused by quantum pathways from nonadjacent quarter cycles.

摘要

我们使用正交偏振双色（OTC）激光脉冲来分离氩原子多光子电离中的量子路径。我们的OTC脉冲由波长为400纳米和800纳米的光组成，相对强度比为10∶1。我们在光电子动量分布中发现了一种迄今未观察到的干涉现象，该现象对OTC脉冲的相对相位有强烈依赖性。模型计算分析表明，这种干涉是由非相邻四分之一周期的量子路径引起的。