Nonlinear dynamics of a blue laser array in a Talbot based cavity

The role of optical feedback in a Talbot based cavity has been studied for many years in laser arrays. Yet, those studies mainly deal with improving (or stabilizing) the global, slow-timescale properties of the laser array such as far-field pattern and optical spectrum. In our work, we shed a new light on Talbot based cavity feedback by exploring the fast-timescale properties of each lasers in the array and by studying destabilization instead of stabilization. We experimentally show that a 1D-array of semiconductor lasers emitting around 445 nm exhibits sub-ns intensity fluctuations that can be partially synchronized between lasers.