Our group focuses on large laser diode arrays as a medium of choice to study non-linear phenomena, collective behaviors and phase synchrony, with both state-of-the-art experimental and numerical capabilities. In particular the effect of external optical feedback and strong coupling between lasers is investigated as a tool towards high-power, low-divergence, coherent laser beams with applications in directed energy, sensing and communication. The wavelengths of interest for our research span from blue light (450 nm) to the near-infrared (1064 nm). We also explore the unique properties of non-linear dynamics to extract weak signals from noisy environments.