Abstract
The physics of passively mode-locked Ti:sapphire femtosecond lasers is a topic of current interest. In this paper, we report a remarkably simple and powerful technique for the characterization of dispersion in broadband tunable passive mode-locked lasers1. A cw-pumped passive mode-locked laser chooses its cavity roundtrip time independent of the pump laser cavity length. If we simply note that the cavity roundtrip time at any particular frequency is exactly the total group delay of a quasimonochromatic wave packet at that frequency, by accurately measuring the cavity repetition rate as a function of frequency while tuning the laser, we obtain the group delay as a function of frequency directly.
© 1992 Optical Society of America
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