Accurate in situ Measurement of Ellipticity Based on Subcycle Ionization Dynamics
Accurate in situ Measurement of Ellipticity Based on Subcycle Ionization Dynamics
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基于次周期电离动力学的椭圆度原位精确测量
DOI：
10.1103/physrevlett.122.013203
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发表时间：
2019
影响因子：
8.6
通讯作者：
Ding Dajun
中科院分区：
文献类型：
--
作者：
Wang Chuncheng;Li Xiaokai;Xiao Xiang Ru;Yang Yizhang;Luo Sizuo;Yu Xitao;Xu Xinpeng;Peng Liang You;Gong Qihuang;Ding Dajun
椭圆偏振激光脉冲(EPLP)在超快科学的许多领域都有广泛的应用，但在激光焦点的相互作用区，椭圆度()从未被测量过。在这封信中，我们提出并实现了一种健壮的方案，通过在时间上重叠两个相同的对角旋转的EPLP来恢复数据。通过改变两个EPLP之间的相位延迟，组合的线性电场被相干地控制以电离Xe原子。阈值以上电离的电子光谱和离子产额受相位延迟的灵敏调制。我们证明了这些调制可以用来精确地确定EPLP。结果表明，该方法具有较高的可靠性和较宽的激光参数适用范围。对激光脉冲的准确反演提供了对激光脉冲的更好的描述，有望对许多强场过程中的子周期动力学进行更精细和定量的控制。
Elliptically polarized laser pulses (EPLPs) are widely applied in many fields of ultrafast sciences, but the ellipticity () has never beenin situmeasured in the interaction zone of the laser focus. In this Letter, we propose and realize a robust scheme to retrieve theby temporally overlapping two identical counterrotating EPLPs. The combined linearly electric field is coherently controlled to ionize Xe atoms by varying the phase delay between the two EPLPs. The electron spectra of the above-threshold ionization and the ion yield are sensitively modulated by the phase delay. We demonstrate that these modulations can be used to accurately determineof the EPLP. We show that the present method is highly reliable and is applicable in a wide range of laser parameters. The accurate retrieval ofoffers a better characterization of a laser pulse, promising a more delicate and quantitative control of the subcycle dynamics in many strong field processes.