High-order harmonic generation in polyatomic systems

30th International Conference on Photonic, Electronic, and Atomic Collisions

Suárez, Noslen^1 ; Chacón, Alexis^1 ; Pérez-Hernández, Jose A.^4 ; Biegert, Jens^1,3 ; Lewenstein, Maciej^1,3 ; Ciappina, Marcelo F.^2

ICFO - Institut de Ciències Fotòniques, Barcelona Institute of Science and Technology, Av. Carl Friedrich Gauss 3, Castelldefels (Barcelona)

08860, Spain^1

Centro de Láseres Pulsados (CLPU), Parque Científico, Villamayor, Salamanca

37185, Spain^2

ICREA - Pg., Lluís Companys 23, Barcelona

08010, Spain^3

Institute of Physics of the ASCR, ELI-Beamlines Project, Na Slovance 2, Prague

182 21, Czech Republic^4

关键词: Electron trajectories;    High order harmonic generation;    Physical mechanism;    Polyatomic molecules;    Polyatomic systems;    Strong-field approximations;    Theoretical approach;    Time frequency analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/875/4/032014/pdf
DOI  :  10.1088/1742-6596/875/4/032014

来源: IOP

【 摘 要 】

We present a theoretical approach of high-order harmonic generation (HHG) in polyatomic molecules based on the strong-field approximation (SFA) and within the frame of the single electron approximation. Our model allow us to turn on and off contributions having distinct physical origins or corresponding to different physical mechanisms. Results in di- and triatomic systems are shown. In addition a time-frequency analysis is presented to investigate the relative weight of the different electron trajectories contributing to the HHG spectra.