Exploration of High-Harmonic Generation from the CS ₂ Molecule by the Lewenstein Method in Two-Color Circularly Polarized Laser Field

Abstract

The high harmonic generation (HHG) from the CS2 molecule in intense laser fields is investigated using the extended Lewenstein method. The initial state is the highest-occupied molecular orbital of the CS2 molecule, which can be well described by Gaussian wave packet using GAMESS-UK package. Compared with the case of the elliptical laser, the HHG can be extended in two-color circularly polarized laser field. The time-frequency analysis and classical electron trajectory as well as the ionization yield curve are also presented to further explain the underlying mechanism. After adding a static electric field on the z-direction, the single quantum path control is realized and the supercontinuum spectra are obtained. Moreover, an isolated 110 as pulse can be obtained by superposing the harmonics from 130th to 180th order.

Femtosecond enhancement cavity with kilowatt average power

“…After introducing Xe to the focus region, HHG has been observed and coupled out of the fsEC, paving the way for the realization of an XUV comb in the near future. This fsEC also enables intra-cavity high harmonic generation and related studies, e.g., mixing gas experiments, multi-color experiments, [27] etc.…”

Cooper minimum of high-order harmonic spectra from an MgO crystal in an ultrashort laser pulse

“…Atoms and molecules irradiated by an intense laser pulse can produce high-order harmonic generation (HHG) [1][2][3][4][5][6][7][8][9][10][11][12][13]. Under the influence of the strong laser field, an electron can be ionized from the bound state, and accelerated in the continuum state, finally it can recombine with the ion and gives rise to the emission of extreme ultraviolet (XUV) radiation [10,14].…”

An improved method for the investigation of high-order harmonic generation from graphene*

“…High-order harmonic generation (HHG) from atomic and molecular gases [1][2][3][4] has been a significant research topic in recent decades due to broad applications, such as diffractive imaging, [5] extracting of structural information of atoms or molecules, [6][7][8][9][10][11][12] probing magnetic dynamics. [13] More importantly, we can construct untrashort attosecond (as) pulses from harmonics, [14][15][16][17][18][19] which is an important tool for observing and controlling the ultrafast electronic dynamics in atoms and molecules.…”