We analyze the formation of non dispersive solitary waves along the propagation dimension of a ring semiconductor laser with coherent forcing. We measure their phase dynamics and show that they can host a topological charge
We analyze the formation of non dispersive solitary waves along the propagation dimension of a ring semiconductor laser with coherent forcing. We measure their phase dynamics and show that they can host a topological charge. OCIS codes: (190.5530)Pulse propagation and temporal solitons; (190.3100) Instabilities and chaos;The formation of dissipative solitons in nonlinear optical systems submitted to coherent forcing is often analyzed in the framework of the Lugiato Lefever equation [1]. Although this equation was initially derived for the description of diffractive effects in an optical cavity filled with a Kerr medium, it has been subsequently adapted to describe propagative dissipative solitons in systems like a fiber ring cavity or whispering gallery mode resonators. In these cases, the spatial coordinate refers to the propagation distance along the system, while the temporal coordinate describes the evolution of the system over many roundtrips [2,3]. The nondispersive waves observed in both of these devices (which are passive systems) are locked to the external forcing and they have received the name of temporal cavity solitons. In this contribution, we address the formation of dissipative solitons along the propagation dimension of an active system, namely a strongly multimode ring semiconductor laser with coherent forcing. Due to its oscillatory nature, the system can diverge very markedly from Lugiato-Lefever like dynamics and in particular it can be expected to display topological solitons which consist of 2π rotations of the relative phase of the system with respect to the forcing [4]. Fig 1. Left: Experimental measurement of the field intensity in the comoving reference frame. Homogeneous regions are locked to the external forcing and can host dissipative solitons. Right: numerical field intensity in the comoving reference frame and field phase within one roundtrip.
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