Circularly polarized attosecond light generation from OCS molecules irradiated by the combination of linear polarized infrared and orthogonal terahertz fields

Ting-Ting Fu; Fu-Ming Guo; Shu-Shan Zhou; Yue Qiao; Xin-Yu Wang; Ji-Gen Chen; Jun Wang; Yu-Jun Yang

doi:10.1063/5.0167522

Circularly polarized attosecond light generation from OCS molecules irradiated by the combination of linear polarized infrared and orthogonal terahertz fields

J Chem Phys. 2023 Oct 28;159(16):164312. doi: 10.1063/5.0167522.

Authors

Ting-Ting Fu^{1

2}, Fu-Ming Guo^{1

2}, Shu-Shan Zhou³, Yue Qiao^{1

2}, Xin-Yu Wang^{1

2}, Ji-Gen Chen⁴, Jun Wang^{1

2}, Yu-Jun Yang^{1

2}

Affiliations

¹ Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
² Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy (Jilin University), Changchun 130012, China.
³ School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China.
⁴ Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Jiaojiang, 318000 Zhejiang, China.

PMID: 37902609
DOI: 10.1063/5.0167522

Abstract

Researching ultrafast dynamics and creating coherent light sources will both benefit significantly from the establishment of polarization control in high-order harmonic generation (HHG). By employing the time-dependent density functional theory method, we investigate HHG of carbonyl sulfide molecules using a combination of a linear polarized infrared (IR) laser and a weaker orthogonal Terahertz (THz) field. Our findings show that by adjusting the amplitude of the THz field, the movement scale of electrons in the THz direction can be tuned, thereby one can control the harmonic intensity in the IR laser direction. This method allows for the creation of near-circularly polarized attosecond pulses. Furthermore, the ellipticity of the attosecond pulse may be changed by modifying the carrier-envelope phase of the IR laser pulse.