Liu Candong, Zeng Zhinan, Li Ruxin, Xu Zhizhan, Nisoli Mauro
Opt Express. 2015 Apr 20;23(8):9858-69. doi: 10.1364/OE.23.009858.
An all-optical method is proposed for the measurement of the spectral phase of isolated attosecond pulses. The technique is based on the generation of extreme-ultraviolet (XUV) radiation in a gas by the combination of an attosecond pulse and a strong infrared (IR) pulse with controlled electric field. By using a full quantum simulation, we demonstrate that, for particular temporal delays between the two pulses, the IR field can drive back to the parent ions the photoelectrons generated by the attosecond pulse, thus leading to the generation of XUV photons. It is found that the generated XUV spectrum is notably sensitive to the chirp of the attosecond pulse, which can then be reliably retrieved. A classical quantum-path analysis is further used to quantitatively explain the main features exhibited in the XUV emission.
提出了一种用于测量孤立阿秒脉冲光谱相位的全光学方法。该技术基于通过将阿秒脉冲与具有可控电场的强红外（IR）脉冲相结合，在气体中产生极紫外（XUV）辐射。通过全量子模拟，我们证明，对于两个脉冲之间的特定时间延迟，IR场可以将阿秒脉冲产生的光电子驱动回母离子，从而导致XUV光子的产生。发现所产生的XUV光谱对阿秒脉冲的啁啾特别敏感，然后可以可靠地恢复该啁啾。进一步使用经典量子路径分析来定量解释XUV发射中表现出的主要特征。
