We demonstrate a method to control remotely the terahertz (THz) source in air based on the bifilamentation of femtosecond laser pulses. By fine tuning the time delay between the two pulses, a significant modulation of the THz intensity from bifilamentation is observed. The phenomenon is attributed to the molecule quantum lensing effect around the air molecule revival time, which changes the separation between the two neighboring plasma producing filaments.
© 2010 Optical Society of America
Original Manuscript: February 19, 2010
Revised Manuscript: April 9, 2010
Manuscript Accepted: April 13, 2010
Published: May 14, 2010
M. Durand, Y. Liu, A. Houard, and A. Mysyrowicz, "Fine control of terahertz radiation from filamentation by molecular lensing in air," Opt. Lett. 35, 1710-1712 (2010)