Temporal behavior of an unstable optical cavity
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Updated: Jul 9, 2026

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
Published on: December 15, 2021
O Emile1, D Chauvat, A Le Floch
1Laboratoire d'Electronique Quantique-Physique des Lasers, Unité Mixte de Recherche du Centre National de Recherche Scientifique 6627, Université de Rennes I, Campus de Beaulieu, F-35042 Rennes Cedex, France.
Abstract:
The relaxation of a geometrically unstable Fabry-Perot cavity is theoretically and experimentally investigated. It is observed that the usual sum of the exponential decays of the intensities in the different transverse modes of the cavity is replaced by a more complex behavior. In particular, light couplings into the fundamental mode of the cavity with initial wave excitation factors larger than unity, i.e., larger than in the case of mode-matched injection, are directly observed. The influence of the cavity Fresnel number and of transverse mode crossings and anticrossings on these cavity decays is isolated.
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