We investigate the evolution of filamentation in air by using a longitudinal diffraction method and a plasma fluorescence imaging technique. The diameter of a single filament in which the intensity is clamped increases as the energy of the pump light pulse increases, until multiple filaments appear.
© 2006 Optical Society of America
(320.7120) Ultrafast optics : Ultrafast phenomena
Original Manuscript: August 19, 2005
Revised Manuscript: November 15, 2005
Manuscript Accepted: November 17, 2005
Y. P. Deng, J. B. Zhu, Z. G. Ji, J. S. Liu, B. Shuai, R. X. Li, Z. Z. Xu, F. Théberge, and S. L. Chin, "Transverse evolution of a plasma channel in air induced by a femtosecond laser," Opt. Lett. 31, 546-548 (2006)