%0 Journal Article %J Opt. Commun. %D 1992 %T Generation of dual-wavelength, synchronized, tunable, high-energy, femtosecond laser pulses with nearly perfect Gaussian spatial profile %A J. Kai Wang %A Y. Siegal %A Lu, C. %A Mazur, E. %X We use self-phase modulation in a single-mode fiber to produce broadband femtosecond laser pulses. Subsequent amplification through two Bethune cells yields high-energy, tunable, pulses synchronized with the output of an amplified colliding-pulse-modelocked (CPM) laser. We routinely obtain tunable 200-J pulses of 42-fs (FWHM) duration with a nearly perfect Gaussian spatial profile. Although self-phase modulation in a single-mode fiber is widely used in femtosecond laser systems, amplification of a figer-generated supercontinuum in a Bethune cell amplifier is a new feature which maintains the high-quality spatial profile while providing high gain. This laser system is particularly well suited for high energy dual-wavelength pump-probe experiments and time-resolved four-wave mixing spectroscopy. %B Opt. Commun. %V 91 %P 77–81 %G eng %U /files/mazur/files/rep_75.pdf %R 10.1063/1.468112