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Stathopulos A, Skupin S, Bergé L. Terahertz pulse generation by multi-color laser fields with linear versus circular polarization. Opt Lett. 2021;46(23):5906-5909doi: 10.1364/OL.442519.
Stathopulos, A., Skupin, S., & Bergé, L. (2021). Terahertz pulse generation by multi-color laser fields with linear versus circular polarization. Optics letters, 46(23), 5906-5909. https://doi.org/10.1364/OL.442519
Stathopulos, Alexandre, et al. "Terahertz pulse generation by multi-color laser fields with linear versus circular polarization." Optics letters vol. 46,23 (2021): 5906-5909. doi: https://doi.org/10.1364/OL.442519
Stathopulos A, Skupin S, Bergé L. Terahertz pulse generation by multi-color laser fields with linear versus circular polarization. Opt Lett. 2021 Dec 01;46(23):5906-5909. doi: 10.1364/OL.442519. PMID: 34851920.
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Opt Lett. 2021 Dec 01;46(23):5906-5909. doi: 10.1364/OL.442519.

Terahertz pulse generation by multi-color laser fields with linear versus circular polarization.

Optics letters

Alexandre Stathopulos, Stefan Skupin, Luc Bergé

PMID: 34851920 DOI: 10.1364/OL.442519

Abstract

We study the influence of the polarization state of multi-color femtosecond laser pulses ionizing air or noble gases on the emitted terahertz radiation. A local-current model and plane wave evaluations predict a cross-over in the THz energy yields with increasing number of pump harmonics, for which circular laser polarization is more efficient for a few harmonics, and linear polarization is favorable for more than six pump colors. Comprehensive 3D numerical simulations of gas jet experiments confirm this property for singly and multiply ionized gases. Rotation of the THz polarization ellipse in the case of circular laser polarization is explained by phase shifts that may alter the phase angle between the harmonics.

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