AlGaAs-based vertical-external-cavity surface-emitting laser exceeding 4  W of direct emission power in the 740–790  nm spectral range

An optically pumped vertical-external-cavity surface-emitting laser (VECSEL) for direct emission in the 740–790 nm wavelength region is reported. The gain structure is based on 12 AlGaAs quantum wells. We demonstrate wavelength tuning between 747 nm and 788 nm and free-running operation with a maximum power of 4.24 W (pump power limited) for a heat sink temperature of 14°C. This laser system addresses a spectral gap not currently covered by VECSEL technology and represents the most powerful VECSEL reported within the 7XX-nm wavelength region.

… In all measurements, the heat sink temperature This was kept at 14°C. The spectrometer with which all spectral measurements presented in this Letter were taken, was a StellarNet BLUE- Wave with a resolution limit of 0.8 nm …