Fraunhofer Institute for Applied Solid State Physics (IAF) of Freiburg, Germany has developed single-mode gallium antimonide (GaSb) VECSELs with what are reckoned to be best-in-class output powers of up to 2.4W, enabling quantum frequency conversion as a low-noise pump source...
Source: https://www.semiconductor-today.com/new ... 0424.shtml