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Elliptically polarized Terahertz emission through four-wave mixing in a two-color filament in air |
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| Authors: | Yanping Chen Claude Marceau Francis Théberge Jacques Dubois |
| Institution: | a Centre d’Optique, Photonique et Laser (COPL) and Département de physique, de génie physique et d’optique, Université Laval, Québec, Canada G1V 0A6 b Defence Research and Development Canada - Valcartier, 2459 Pie-XI Blvd. North, Québec, Canada G3J 1X5 |
| Abstract: | We diagnosed the polarization characteristics of Terahertz emission from a two-color femtosecond laser filament when the polarizations of ω and 2ω beams are orthogonal. We discovered that the THz pulse is elliptically polarized. The generation mechanism could be through four-wave optical rectification inside the filament zone where the inversion symmetry of air is broken. |
| Keywords: | 42 25 Ja 42 65 Jx 42 65 Ky |
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