NKT Photonics A/S has launched high-power Koheras BoostiK single-mode and single-frequency fiber lasers that offer up to 15-W output with low phase noise and an ultranarrow linewidth for applications in atomic physics, sensing, metrology, and light detection and ranging. Fiber monolithic and maintenance-free, they are supplied in an industrially rugged air-cooled package that can handle 24/7 operation in laboratory and industrial environments. They provide up to 10 W at 1.55 µm and 15 W at 1.06 µm, produce low phase and intensity noise, and are burst noise- and mode-hop-free. Many wavelengths are available, and fast tuning enables external stabilization. Applications include quantum optics/computing and phenomena, nonlinear optics pumping, laser-based metrology, and optical heterodyning and coherent communication.