Field-free orientation of linear molecules by femtosecond co-rotating two-color circularly polarized laser pulses

Kehan Li; Jian Wang; Hate Wang; Yifang Song; Kuanjun Fan; Jinfeng Yang; O. I. Meshkov

doi:10.1117/12.2619474

1 July 2022 Field-free orientation of linear molecules by femtosecond co-rotating two-color circularly polarized laser pulses

Kehan Li, Jian Wang, Hate Wang, Yifang Song, Kuanjun Fan, Jinfeng Yang, O. I. Meshkov

Author Affiliations +

Proceedings Volume 12291, 1st International Conference on UltrafastX 2021; 1229103 (2022) https://doi.org/10.1117/12.2619474
Event: 1st International Conference on UltrafastX 2021, 2022, Xi'an, China

Abstract

The orientation of molecules is essential to study molecular angle-differential properties such as ionization and scattering cross-sections in material physics and chemistry. Ultrafast electron diffraction (UED) facilities offer effective ways to explore the ultrafast dynamics of orientated molecules. Generally, the orientation of molecules is generated by a strong dc-field. However, the presence of a strong field may influence detection outcome. Field-free orientation of molecules is preferable, avoiding the disadvantages of traditional dc-field excitation. This paper proposes a practical and versatile method for field-free molecular orientation using the co-rotating two-color circularly polarized ultrafast laser pulses, and the orientation of the molecules can be controlled by the relative phase of the two-color laser fields. We also performed our simulation in CO molecules with the Born-Oppenheimer and rigid rotor approximations, and the light-molecule interaction Hamiltonian is given by the low-order perturbation theory.

Citation Download Citation

Kehan Li, Jian Wang, Hate Wang, Yifang Song, Kuanjun Fan, Jinfeng Yang, and O. I. Meshkov "Field-free orientation of linear molecules by femtosecond co-rotating two-color circularly polarized laser pulses", Proc. SPIE 12291, 1st International Conference on UltrafastX 2021, 1229103 (1 July 2022); https://doi.org/10.1117/12.2619474

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