Spectral phase measurement of attosecond pulses using the quantum beat between the P 1 ∕ 2 and P 3 ∕ 2 levels of alkali-metal atoms
Spectral phase measurement of attosecond pulses using the quantum beat between the P 1 ∕ 2 and P 3 ∕ 2 levels of alkali-metal atoms
复制标题
使用碱金属原子 P 1 ∕ 2 和 P 3 ∕ 2 能级之间的量子拍进行阿秒脉冲的光谱相位测量
DOI：
10.1103/physreva.76.033810
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发表时间：
2007
影响因子：
2.9
通讯作者：
R. Itakura
中科院分区：
文献类型：
--
作者：
R. Itakura
提出了一种利用碱金属原子{sup 2}P态角分辨光电子能谱测量阿秒脉冲光谱相位的方法。{sup 2}P{sub 1/2}和{sup 2}P{sub 3/2}态的相干叠加使我们能够观察到量子拍频，其相位偏移作为光电子能量的函数获得。推导出的公式阐明了相位偏移直接用于确定阿秒脉冲的频谱相位。该方法不仅适用于近变换极限的阿秒脉冲，而且适用于具有相同频谱的显著啁啾脉冲。对Cs原子的数值模拟验证了实验的可行性和分析的简单性。从实用的角度来看，不需要最先进的技术，如高次谐波的非线性光学，基波脉冲的相位稳定和延迟线的亚光周期分辨率，其中一些在其他方法中已经被要求。
We propose a method for measuring the spectral phase of attosecond pulses by means of angle-resolved photoelectron spectroscopy of alkali-metal atoms in the {sup 2}P state. A coherent superposition of the {sup 2}P{sub 1/2} and {sup 2}P{sub 3/2} states allows us to observe the quantum beat, whose phase offset is obtained as a function of photoelectron energy. The formulation derived in this study elucidates that the phase offset is straightforwardly utilized for determining the spectral phase of attosecond pulses. This method is applicable not only to near transform-limited attosecond pulses, but also to significantly chirped pulses with the same spectrum. Numerical simulation for Cs atoms demonstrates the feasibility in the experiment and the simplicity in the analysis. From a practical point of view, there is no need for the most advanced technologies like nonlinear optics by high harmonics, phase stabilization of fundamental pulses, and sub-optical-cycle resolution of a delay line, some of which have been required in the other methods.