title: Strong terahertz emission enhancement via femtosecond laser filament concatenation in air.
abstract: We investigate the emission of terahertz (THz) radiation from two laser filaments in air. An increase by 1 order of magnitude of the overall THz power is found when the two filaments are coherently linked on-axis, leading to a single longer concatenated filament. The observed enhancement is found to be the same for the cases of single-color and two-color filamentation approaches.
authors.affiliation: Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), P.O. Box 1527, 71110 Heraklion, Greece. manceaujm@iesl.forth.gr
authors.forename: J-M
authors.initials: JM
authors.lastname: Manceau
authors.forename: M
authors.initials: M
authors.lastname: Massaouti
authors.forename: S
authors.initials: S
authors.lastname: Tzortzakis