Two-dimensional spectral interpretation of time-dependent absorption near laser-coupled resonances
Two-dimensional spectral interpretation of time-dependent absorption near laser-coupled resonances
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DOI：
10.1088/0953-4075/47/12/124008
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发表时间：
2014-06-28
影响因子：
1.6
通讯作者：
Pfeifer, Thomas
中科院分区：
文献类型：
--
作者：
Blaettermann, Alexander;Ott, Christian;Pfeifer, Thomas
我们提出了一种二维时域光谱方法来提取与超短激光脉冲相互作用引起的原子激发态的振幅和相位变化。该技术是基于受扰偏振衰减的吸收光谱的傅立叶分析。该方法的分析描述揭示了如何从测量中直接获得幅度和相位信息。我们将该方法应用于氦原子，这是由阿秒脉冲极紫外光激发，激光诱导的双激发态耦合特性的实验。
We demonstrate a two-dimensional time-domain spectroscopy method to extract amplitude and phase modifications of excited atomic states caused by the interaction with ultrashort laser pulses. The technique is based on Fourier analysis of the absorption spectrum of perturbed polarization decay. An analytical description of the method reveals how amplitude and phase information can be directly obtained from measurements. We apply the method experimentally to the helium atom, which is excited by attosecond-pulsed extreme ultraviolet light, to characterize laser-induced couplings of doubly excited states.