We investigate the influence of a chirped phase on femtosecond pulses propagating in air. Pulses with an initially negative chirp are temporally compressed by compensation with group-velocity dispersion. We demonstrate that this property, combined with plasma defocusing, can be used to trigger filamentation at different foci, increase self-guiding ranges, or even shorten pulse duration.
© 2005 Optical Society of America
(050.1590) Diffraction and gratings : Chirping
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(280.3640) Remote sensing and sensors : Lidar
Rachel Nuter, Stefan Skupin, and Luc Bergé, "Chirp-induced dynamics of femtosecond filaments in air," Opt. Lett. 30, 917-919 (2005)