Elliptically polarized terahertz emission in the forward direction of a femtosecond laser filament in air

Chen, Yanping; Marceau, Claude; Liu, Weiwei; Sun, Zhen-Dong; Zhang, Yizhu; Théberge, Francis; Châteauneuf, Marc; Dubois, Jacques; Chin, See Leang
December 2008
Applied Physics Letters;12/8/2008, Vol. 93 Issue 23, p231116
Academic Journal
Elliptically polarized terahertz emission from a femtosecond laser filament in air in the forward direction was discovered by using a wire grid polarizer and electro-optic sampling technique. The generation mechanism could be through four-wave optical rectification or second-order optical rectification inside the filament zone where the inversion symmetry of air is broken.


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