We report on the demonstration of highly efficient blue lasers based on intracavity frequency doubling vertical-external-cavity surface-emitting lasers (VECSELs). By optimizing the number of InGaAs quantum wells and employing carrier blocking layers in resonant periodic gain structures, we observed the pump-power-limited output power of at for an quantum well VECSEL. With a frequency doubling crystal inside the cavity, continuous-wave blue output was demonstrated. Power conversion efficiencies ( power∕pump input power) of 22.5% and 9.5% are realized for and , respectively.
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