Terahertz emission from a dc-biased two-color femtosecond laser-induced filament in air

Tie-Jun Wang; Marceau, Claude; Yanping Chen; Shuai Yuan; Théberge, Francis; Châteauneuf, Marc; Dubois, Jacques; See Leang Chin
May 2010
Applied Physics Letters;5/24/2010, Vol. 96 Issue 21, p211113
Academic Journal
The generation of terahertz (THz) emission from a dc-biased two-color femtosecond laser-induced filament in air was systematically investigated. A polarization analysis demonstrated that the THz emission could be the sum of two components: one generated by two-color laser-induced filamentation and the second induced by the external dc electric field. The first component is mostly from four-wave mixing process and a transient transverse electric current under the action of the external dc field could be responsible for the second THz emission.


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