Coherent control of broadband isolated attosecond pulses in a chirped two-color laser field

作者：Pu Zou, Zhinan Zeng, Yinghui Zheng, Yingying Lu, Peng Liu, Ruxin Li, Zhizhan Xu · 发表于：Physical Review A · 年份：2010 · DOI：10.1103/physreva.81.033428 · 被引用次数：39 · 研究领域：Laser-Matter Interactions and Applications、Advanced Fiber Laser Technologies、Laser-Plasma Interactions and Diagnostics

A theoretical investigation is presented that uses a strong two-color laser field composed of a linearly chirped fundamental ($900$ nm) and its subharmonic ($1800$-nm) laser pulses to control coherently the broadband isolated attosecond pulses in high-order harmonic generations. After the subharmonic field is added, the intrinsic chirp of harmonic emission can be reduced significantly, and consequently, the temporal synchronization of harmonic emission with different photon energies at the level of the single-atom response can be realized. In addition, the scheme is robust against the carrier envelope phase variation to produce a twin pulse of stable sub-$100$-as duration, and the relative intensity of the twin pulses can be changed just by adjusting the relative time delay of the two driving pulses, which is of benefit in general pump-probe experiments.