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Abstract
We theoretically study the high-order harmonics and single attosecond pulse generation from a pre-excited He+ ion in a multicycle two-color spatially inhomogeneous field. It is shown that the broadband supercontinuum spectrum and single quantum path selection can be realized, and then a single 15.2 as pulse is directly obtained. By appending a uv attosecond pulse to the two-color spatially inhomogeneous field at a proper time, the conversion efficiency of the high-energy part of the supercontinuum is improved by at least an order of magnitude, which enables the production of an intense single 17.3 as pulse.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Funding
This work was supported by the Education Committee Natural Science Foundation of Shaanxi Province, China [grant number 18JK0050], the National Undergraduate Training Program for Innovation and Entrepreneurship [grant number S202010721019], the Innovation and Entrepreneurship Training Program for College Students in Shaanxi Province [grant number S201910721030], and the College Student Innovation Training Plan of Baoji University of Arts and Sciences [grant numbers 2019XJ067, 2019XJ077, and 2019XJ083]. R. Gao was supported by the Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing [grant number 2020CP10], Xi’an University of Technology.