Broadband microwave-rate dark pulse microcombs in dissipation-engineered LiNbO₃ microresonators.

ABSTRACT: Kerr microcombs generated in optical microresonators provide broadband light sources bridging optical and microwave signals. Their translation to thin-film lithium niobate unlocks second-order nonlinear optical interfaces such as electro-optic modulation and frequency doubling for completing comb functionalities. However, the strong Raman response of LiNbO₃ has complicated the formation of Kerr microcombs. Until now, dark pulse microcombs, requiring a double balance between Kerr nonlinearity and normal group velocity dispersion as well as gain and loss, have remained elusive in LiNbO₃ microresonators. Here, by incorporating dissipation engineering, we demonstrate dark pulse microcombs with 25 GHz repetition frequency and 200 nm span in a high-Q LiNbO₃ micro

SUBMITTER: Lv X 

PROVIDER: S-EPMC11893762 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature