Elliptically polarized terahertz emission from a femtosecond laser filament in air

Yanping Chen; Claude Marceau; Weiwei Liu; Zhen-Dong Sun; Yizhu Zhang; Francis Théberge; Marc Châteauneuf; Jacques Dubois; See Leang Chin

doi:10.1117/12.820134

16 February 2009 Elliptically polarized terahertz emission from a femtosecond laser filament in air

Yanping Chen, Claude Marceau, Weiwei Liu, Zhen-Dong Sun, Yizhu Zhang, Francis Théberge, Marc Châteauneuf, Jacques Dubois, See Leang Chin

Author Affiliations +

Proceedings Volume 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology; 727709 (2009) https://doi.org/10.1117/12.820134
Event: Photonics and Optoelectronics Meetings, 2008, Wuhan, China

Abstract

We diagnosed the polarization characteristics of Terahertz (THz) emission from a femtosecond laser filament in air in the forward direction by using a wire grid polarizer and E-O sampling technique. The experimental results have demonstrated that the investigated THz pulse is elliptical polarized. It indicates that there is a new generation mechanism for THz emission from a laser filament other than the transition-Cherenkov radiation which is radially polarized. The generation mechanism could be through four-wave optical rectification or second-order optical rectification inside the filament due to the spatial asymmetry of the generated plasma column in the experiment.

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Yanping Chen, Claude Marceau, Weiwei Liu, Zhen-Dong Sun, Yizhu Zhang, Francis Théberge, Marc Châteauneuf, Jacques Dubois, and See Leang Chin "Elliptically polarized terahertz emission from a femtosecond laser filament in air", Proc. SPIE 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology, 727709 (16 February 2009); https://doi.org/10.1117/12.820134

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