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

Alexandre Stathopulos | Zendy; Stefan Skupin | Zendy; Luc Bergé | Zendy

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

Author(s) -

Alexandre Stathopulos,

Stefan Skupin,

Luc Bergé

Publication year - 2021

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.442519

Subject(s) - optics , terahertz radiation , laser , polarization (electrochemistry) , harmonics , brewster's angle , circular polarization , linear polarization , femtosecond , elliptical polarization , physics , materials science , chemistry , brewster , quantum mechanics , voltage , microstrip

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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