Author(s): F. Leo, T. Hansson, I. Ricciardi, M. De Rosa, S. Coen, S. Wabnitz, and M. Erkintalo
A theoretical framework to model quadratically nonlinear resonators reveals a new type of modular instability that triggers the formation of optical frequency combs.

[Phys. Rev. Lett. 116, 033901] Published Thu Jan 21, 2016