7 W high-efficiency continuous-wave green light generation by intracavity frequency doubling of an end-pumped vertical external-cavity surface emitting semiconductor laser

Abstract

The authors report the demonstration of highly efficient continuous-wave green light at 535nm generation by intracavity frequency doubling of an end-pumped vertical external-cavity surface emitting semiconductor laser (VECSEL). The beta-barium borate (β-BaB2O4) crystals, cut for critical type I phase matching at room temperature, are used for second harmonic generation of the laser. In combination with an end-pumped VECSEL and efficient intracavity frequency doubling with a folded three-mirror cavity, more than 7W green light output power is obtained at pump power of 26W. The optical conversion efficiency of 27% is achieved from pump power to second harmonic power.