Abstract
The generation of femtosecond optical pulses using the feedback from an external nonlinear cavity is now a well established technique. The principle consists of interfering a reference pulse with a chirped version of itself, where the chirping is due to self-phase modulation (SPM) in a Kerr-like material. By adjusting the relative phase between the pulses, it is possible to achieve pulse shortening at each round-trip and positive differential gain for the short pulse.
© 1992 Optical Society of America
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