Abstract.
It is well known that saturating gain media can give rise to superluminal pulse propagation velocity. In most mode-locked lasers the effect is unmeasurably small and has not yet been directly demonstrated. We present experiments on the initial transient of an erbium fiber laser that show a dynamic shift in the propagation velocity to a value larger than the medium’s linear group velocity as the pulse builds up.
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Received: 14 December 1998 / Revised version: 21 May 1999 / Published online: 25 August 1999
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Ströker, D., Hüve, J. & Mitschke, F. Superluminal pulse propagation in an erbium fiber laser. Appl Phys B 69, 323–326 (1999). https://doi.org/10.1007/s003400050812
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DOI: https://doi.org/10.1007/s003400050812