Frequency comb solutions for driven chi((2)) optical microresonators

摘要

Frequency combs in chi((2)) optical microresonators caused by cascaded second-order nonlinear processes currently attract great research interest. In contrast to chi((3)) resonators, two light amplitudes relevant to the first and second harmonics (FH and SH), two dispersion coefficients, and a considerable difference of the FH and SH group velocities (the walk-off) must be taken into account to investigate localized coherent structures (solitons) propagating with acommonvelocity. Finding such comb solutions taking into account external pumping is a crucial step toward the chi((2)) combs. We report on two new families of driven soliton-comb solutions for chi((2)) microresonators. They are strongly localized, corresponding to spectrally broad combs, and possess well-defined FH and SH frequency detunings, propagation velocities, and, generally, nonzero spatial backgrounds. (C) 2020 Optical Society of America