We examine the conical terahertz emission from the superluminous ionization front created in air by an axicon-focused femtosecond laser pulse. We develop the theoretical model that explains the experimental results and predicts new possibilities to control terahertz pulse parameters.
© 2010 Optical Society of America
Original Manuscript: August 7, 2009
Revised Manuscript: December 8, 2009
Manuscript Accepted: December 10, 2009
Published: January 15, 2010
V. A. Kostin and N. V. Vvedenskii, "Ionization-induced conversion of ultrashort Bessel beam to terahertz pulse," Opt. Lett. 35, 247-249 (2010)