Dynamics of evanescent field-coupled fiber lasers: two cores solution

Erik J. Bochove

doi:10.1117/12.521106

1 June 2004 Dynamics of evanescent field-coupled fiber lasers: two cores solution

Erik J. Bochove

Proceedings Volume 5333, Laser Resonators and Beam Control VII; (2004) https://doi.org/10.1117/12.521106
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

Abstract

We extend a model of the evanescent field-coupled multi-core Yb-doped fiber laser to include fluctuations of the level populations with the goa lof determining the stability properties of collective modes. The nonlinear differential equations for light intensity, the phases of the electric fields, and the occupation number of the upper laser level of each core are integrated numerically, while, for two cores the relaxation rates, oscillation frequencies, and stability criteria are determined analytically from the set of linearized equations. For example, for two identical lasers we find the in-phase super mode to be unstable in the range 0<κ/Δβ_nl<1, where κ is the inter-guide coupling constant and Δβ_nl the non-linear change in the mode propagation constant. The system is bi-stable for |κ/Δβ_nl|>1, and we describe how switching can be performed. Besides evanescent-field coupled lasers the analysis may be applicable to other coupling mechanisms, such as external cavities, although with some caution.

Citation Download Citation

Erik J. Bochove "Dynamics of evanescent field-coupled fiber lasers: two cores solution", Proc. SPIE 5333, Laser Resonators and Beam Control VII, (1 June 2004); https://doi.org/10.1117/12.521106

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