High power all solid state laser system near 280 nm

We present a stable high power all solid state laser system emitting 1-W of continuous wave laser radiation at a wavelength of 559 nm or 275 mW near 280 nm. The system consists of a commercial 2-W fiber laser with a line width of less than 200 kHz at 1118 nm and two home-built subsequent second harmonic generation external ring cavities using LBO and BBO crystals, respectively. The system is designed to act as a detection and cooling laser for trapped Mg+ ions.