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.
© 2010 Optical Society of America
Original Manuscript: February 24, 2010
Revised Manuscript: June 9, 2010
Manuscript Accepted: June 9, 2010
Published: July 12, 2010
J.-M. Manceau, M. Massaouti, and S. Tzortzakis, "Strong terahertz emission enhancement via femtosecond laser filament concatenation in air," Opt. Lett. 35, 2424-2426 (2010)