title: Generation of isolated attosecond pulses of sub-atomic-time durations with multi-cycle chirped polarization gating pulses.
abstract: We theoretically investigate the X-ray supercontinuum generated by interaction of multi-cycle, chirped polarization gating pulses with the helium gas. It is shown that with this scheme, an isolated sub-50-attosecond pulse can be obtained straightforwardly without any phase compensation. Interestingly, if one selects an extremely broad spectral range near the high-order harmonic cutoff, an isolated and intense sub-24-attosecond pulse can be generated after phase compensation, which could be used to detect and control the electronic dynamics inside the atoms. Furthermore, it is found that the generation of such a broad and smooth X-ray supercontinuum is not so stringent on the selection of the simulated parameters, allowing for the experimental demonstration of this technique in the future.
authors.affiliation: School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China. chaojinzhang@163.com
authors.forename: Chaojin
authors.initials: C
authors.lastname: Zhang
authors.forename: Jinping
authors.initials: J
authors.lastname: Yao
authors.forename: Jielei
authors.initials: J
authors.lastname: Ni