Topological-cavity surface-emitting laser

Output power and beam quality are the two main bottlenecks for semiconductor lasers-the favourite light sources in countless applications because of their compactness, high efficiency and cheapness. Both limitations are due to the fact that it becomes increasingly harder to stabilize a single-mode laser over a broader chip area without multi-mode operations. Here we address this fundamental difficulty with the Dirac-vortex topological cavity(1), which offers the optimal single-mode selection in two dimensions. Our topological-cavity surface-emitting laser (TCSEL) exhibits 10 W peak power, sub-1 degrees divergence angle and 60 dB side-mode suppression, among the best-reported performance ever at 1,550 nm-the most important telecommunication and eye-safe wavelength where high-performance surface emitters have always been difficult to make(2). We also demonstrate the multi-wavelength capability of two-dimensional TCSEL arrays that are not generally available for commercial lasers(2,3). TCSEL, as a new-generation high-brightness surface emitter, can be directly extended to any other wavelength range and is promising for an extremely wide variety of uses.

Automated summary

Output power and beam quality are the main limitations for semiconductor lasers. The use of Dirac-vortex topological cavity overcomes the difficulty of single-mode selection and achieves excellent performance. These lasers can be used at important wavelengths for communication and safety, and also have the capability for multiple wavelengths, making them highly versatile.