Abstract
The influence of the waveform of circularly polarized laser field on high-order harmonic (HH) generation from atoms is investigated by solving the time-dependent Schrödinger equation (TDSE) and by classical trajectory analysis, without assuming an initial transverse velocity. Both the HH simulation and the classical trajectory calculation demonstrate that the positive temporal gradient of the electric field amplitude is a key factor that makes the electron return to the parent ion possible. Moreover, the larger the temporal gradient of the field amplitude is, the more the electron trajectories will revisit the parent ion. Correspondingly, the enhancement of HH is observed. This is confirmed by the pulse-duration dependence of the harmonic yield driven by a circularly polarized laser field.
Highlights
The rapid development of attosecond physics, including the subject of high-order harmonic generation [1,2,3,4,5], ionization [6,7,8,9,10], target excitation [11,12,13], etc., has allowed us to probe ultrafast dynamics in atoms and molecules with unprecedented temporal and spatial resolutions
We study the influence of the waveform of driving field on high-order harmonic (HH) generation from atoms driven by circularly polarized laser pulses
It is found that the electron trajectories without an initial transverse velocity can revisit the parent ion. Both the time-dependent Schrödinger equation (TDSE) simulation and the classical trajectory analysis show that the positive temporal gradient of the electric field amplitude is a key factor that makes the electron return to the parent ion possible
Summary
The rapid development of attosecond physics, including the subject of high-order harmonic generation [1,2,3,4,5], ionization [6,7,8,9,10], target excitation [11,12,13], etc., has allowed us to probe ultrafast dynamics in atoms and molecules with unprecedented temporal and spatial resolutions. The discussion on the factors leading to the electron return and HH generation driven by circularly polarized laser pulse is incomplete. We study the influence of the waveform of driving field on high-order harmonic (HH) generation from atoms driven by circularly polarized laser pulses. It is found that the electron trajectories without an initial transverse velocity can revisit the parent ion. Both the time-dependent Schrödinger equation (TDSE) simulation and the classical trajectory analysis show that the positive temporal gradient of the electric field amplitude is a key factor that makes the electron return to the parent ion possible. Our results provide a new way of controlling the HH emission in a circularly polarized laser field
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
