We found that, at the focus of a chromatic lens, a laser pulse with a self-modulated phase can be shortened due to the radial dependence of the group delay imposed by the lens. Normally, this group delay stretches a short pulse into a long pulse by spreading the arrival time of the pulse at the focus. However, for a pulse with a self-modulated phase, it causes the fields with different phases to overlap, thus resulting in destructive interference that shortens the pulse.
© 2006 Optical Society of America
Original Manuscript: July 3, 2006
Revised Manuscript: October 2, 2006
Manuscript Accepted: October 5, 2006
Published: December 13, 2006
Yuelin Li and Robert Crowell, "Shortening of a laser pulse with a self-modulated phase at the focus of a lens," Opt. Lett. 32, 93-95 (2007)