Abstract

We study the effects of Coulomb potentials on high-harmonic generation from a hydrogen atom exposed to strong laser fields by numerically simulating the time-dependent Schrödinger equation. Different roles played by the Coulomb potential in the generation of above-threshold harmonics (ATHs) and below-threshold harmonics (BTHs) are distinguished. By gradually screening the Coulomb potential, we find that the BTHs are greatly suppressed, but the ATHs do not change sensitively. Meanwhile, the screening of the Coulomb potential may modify the interference structure of the BTHs, which are induced by the bound–bound states transition and continuum-bound states transition. This study gives an intuitive picture describing the response of a bound or free electron in a laser-dressed Coulomb potential.

© 2016 Optical Society of America

Role of the Coulomb potential on the ellipticity in atomic high-order harmonics generation

Xiaosong Zhu, Meiyan Qin, Qingbin Zhang, Weiyi Hong, Zhizhan Xu, and Peixiang Lu
Opt. Express 20(15) 16275-16284 (2012)

Ionization and high harmonic generation of two-dimensional quasiperiodic structures in arbitrarily polarized strong laser fields

Lu-Ning Li and Feng He
J. Opt. Soc. Am. B 34(1) 52-59 (2017)

Rabi-flopping signatures in below-threshold harmonic generation from the stretched H₂ and N₂ molecules in intense laser fields

Pan Wei, Zhong Guan, Ling-Ling Du, Zhi-Hong Jiao, Lei Zhang, Guo-Li Wang, Shi-Lin Hu, and Song-Feng Zhao
Opt. Express 29(26) 43212-43225 (2021)

Polarization properties of below-threshold harmonics from aligned molecules H2+ in linearly polarized laser fields

Fulong Dong, Yiqun Tian, Shujuan Yu, Shang Wang, Shiping Yang, and Yanjun Chen
Opt. Express 23(14) 18106-18116 (2015)

Pure even and odd harmonics produced in modeled hydrogen molecular ions in single-color strong laser fields

Liang Xu and Feng He
J. Opt. Soc. Am. B 36(4) 840-845 (2019)