High optical output power in the UVA range of a frequency-doubled, strain-compensated AlGaInP-VECSEL

We present a maximum continuous-wave optical output power of 260 mW from an optically pumped, frequency-doubled vertical-external-cavity surface-emitting laser with wavelengths ranging from 325 to 332 nm. The device consists of a GaInP/AlGaInP multi-quantum-well structure grown using metal-organic vapour-phase epitaxy. We use strain compensation in the active region of the laser chip to for better performance at short wavelengths. In addition to wavelength-tuning results in the UVA region, power transfer measurements of the fundamental mode exceeding 1.2 W are presented.