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Velocity of pulse propagation in media with amplitude nonlinearity

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Abstract

The propagation velocity of optical wave fronts can be accelerated by the influence of gain saturation. We report systematic measurements for the specific case of Brillouin gain in optical fibers. A simplified analytic rate equation approach permits a qualitative understanding of the observations in terms of a pure amplitude nonlinearity. We point out that there is a close analogy to a mode-locked laser with gain saturation. Pursuing this analogy, we can explain why the changes in propagation velocity are hardly measurable for synchronously pumped lasers, but easily amount to several percent for amplifiers or lasers based on stimulated Brillouin scattering.

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Authors and Affiliations

  1. Institut für Quantenoptik, Welfengarten 1, D-30167, Hannover, Germany

    M. Dämmig & F. Mitschke

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  1. M. Dämmig
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  2. F. Mitschke
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Dämmig, M., Mitschke, F. Velocity of pulse propagation in media with amplitude nonlinearity. Appl. Phys. B 59, 345–349 (1994). https://doi.org/10.1007/BF01081403

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