Open AccessCarrier-envelope phase-dependent molecular high-order harmonic generation from H2+ in a multi-cycle regime
Author(s) -
Baoning Wang,
Lixin He,
Hua Yuan,
Qingbin Zhang,
Pengfei Lan,
Peixiang Lu
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.033440
Subject(s) - attosecond , high harmonic generation , physics , harmonics , carrier envelope phase , laser , modulation (music) , phase (matter) , optics , envelope (radar) , electron , harmonic , atomic physics , ultrashort pulse , quantum mechanics , telecommunications , radar , voltage , computer science , acoustics
Carrier-envelope phase (CEP) dependence of high-order harmonic generation (HHG) from H2+ in a multi-cycle laser pulse is investigated by solving the non-Born-Oppenheimer time-dependent Schrödinger equation (TDSE). It is found that high harmonics in the plateau exhibit counterintuitive frequency modulation (FM) as the CEP of the multi-cycle laser varies. Based on the classical electron trajectories and time-frequency analysis, this multi-cycle CEP-dependent FM is demonstrated to result from the interference of half-cycle HHG radiations, which is modulated by laser-driven nuclear motion. The mechanism of the CEP-dependent FM is further confirmed by simulations based on a simple algorithm in the time domain, which satisfactorily reproduces the TDSE results. The CEP-dependent FM encodes rich information on the correlated electron and nuclear dynamics, which paves the way for probing nuclear motion with attosecond resolution.