Large temporal front distortion of femtosecond pulses occurs in lenses having chromatic aberration. The effect is due to the difference between the phase and group velocities. Equations describing the pulse-front delay in singlet lenses, achromats, and compound lenses are presented. The pulse-front delay is several orders of magnitude larger than the broadening caused by group-velocity dispersion in the lens material. Delays occurring in Fresnel-type zone plates are also described.
© 1989 Optical Society of America
Original Manuscript: June 24, 1988
Manuscript Accepted: November 6, 1988
Published: January 15, 1989
Z. Bor, "Distortion of femtosecond laser pulses in lenses," Opt. Lett. 14, 119-121 (1989)