Abstract
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 a common velocity. 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.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
S. Smirnov, B. Sturman, E. Podivilov, and I. Breunig
Opt. Express 28(12) 18006-18017 (2020)
S. Smirnov, V. Andryushkov, E. Podivilov, B. Sturman, and I. Breunig
Opt. Express 29(17) 27434-27449 (2021)
S. Smirnov, E. Podivilov, and B. Sturman
J. Opt. Soc. Am. B 40(3) 516-522 (2023)