Abstract
We identify optimal conditions for the generation and isolation of attosecond pulses in an overdriven ionized medium. In a high-pressure and highly ionized gas, the spatiotemporal wavefront rotation of a driving laser can be optimized, leading to complete spatial separation of successive attosecond bursts in the far field. The resulting isolated attosecond pulses (IAPs) are much more divergent such that they are spatially separated from the driving laser in the far field. We show that the time delay of near-field harmonic emission along the radial distance determines the divergence of the attosecond burst in the far field. The generated IAPs are phase matched upon propagation in the second half of the gas medium. Validity of the generation scheme is tested at different carrier–envelope phases for a few-cycle laser pulse and by synthesizing the fundamental and its second harmonic field for a long-duration pulse.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Jin-Xu Du, Guo-Li Wang, Xuan-Hong Gao, Xiao-Yong Li, Zhi-Hong Jiao, Song-Feng Zhao, and Xiao-Xin Zhou
Opt. Lett. 49(6) 1571-1574 (2024)
Qingbin Zhang, Lixin He, Pengfei Lan, and Peixiang Lu
Opt. Express 22(11) 13213-13233 (2014)
Yan Jiang, Zi-Yu Chen, Zhanjun Liu, Lihua Cao, Chunyang Zheng, Rui Xie, Yue Chao, and Xiantu He
Opt. Lett. 46(6) 1285-1288 (2021)