Ring Lasers show very different dynamical behaviours due to their many degrees of freedom, their symmetry properties and high non linear medium. Reported dynamics range from limit cycle oscillations, to mode-locking, bi-stability in propagation direction, etc... The work here presented is focused on the spatio temporal dynamical behaviour of the electric fields retaining the spatial effects induced to the medium.
In the first part of the talk, the longitudinal modal properties of a Ring cavity are studied and compared with the modal properties of a Fabry-Pérot cavity and applied experiments onto the modal properties of a real device, in this case a Semiconductor Ring Laser with light extraction sections [S.Fürst, et al. Appl. Phys. Lett. 93, 251109 (2008)].
In the second part of the talk, the multimode dynamics of a two-level ring laser is numerically explored using a bidirectional Travelling Wave Model retaining the spatial effects due to the presence of counter-propagating electric fields in the population inversion. Novel dynamical regimes where the emission in each direction occurs at different wavelength are studied. Modelocked unidirectional emission for large gain bandwidth and relatively small detuning is reported. Finally, I will discuss about other optical cavities geometries.
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