Dirac‐Scaled Topological Edge States for High‐Performance Surface Emission

Topological edge‐state lasers, benefiting from the backscattering immunity and robustness of topologically protected edge modes, hold great promise for applications including large‐scale integration, surface emission, and vortex beam generation. However, their optical modes are tightly confined along the topological interface, offering only 1D degrees of freedom. This limitation often results in relatively high lasing thresholds and low output powers. In this work, we report a Dirac‐scaled topological edge‐state surface‐emitting laser with enhanced performances. By embedding a photonic crystal with Dirac‐cone dispersion at Γ point along the conventional topological interface of emulating quantum‐spin Hall effect, topological edge states hybridize with the bulk modes of Dirac photonic crystal with well‐maintained pseudospin transport characteristics. This favorable mode matching significantly enlarges the edge state modal area and effectively suppresses out‐of‐plane radiation losses, thereby enhancing the quality factors. Based on this Dirac‐scaled topological edge‐state design, we demonstrate a significantly reduced pump threshold ≈16 kW cm −2 and a high output power ≈65 mW with an external quantum efficiency over 16%. These results provide a new route for advancing the performance of topological edge‐state lasers and for integrating high‐performance topological photonic devices.