Optically Pumped GaSb-Based VECSELs
We report on the current status of high-output-power optically pumped vertical-external-cavity surface-emitting lasers (VECSELs) with emission wavelengths of around 2.3 μm. The (AlGaIn)(AsSb) materials system used and the requirements for the VECSEL structure design and growth are discussed. Furthermore, two distinctive optical pumping concepts, barrier pumping at pump wavelengths around 1 μm, and “in-well” pumping at 1.96 μm are compared. For the barrier pumped VECSEL a cw output power of 1.5 W has been achieved with 10 W of pump power and at a heat sink temperature of −15°C. The in-well pumped VECSEL reached 3.2 W of output power at −15°C for an absorbed pump power of only 13.5 W, at a significantly increased differential power efficiency compared to the barrier pumped VECSEL (25% instead of 16%).
KeywordsPump Power Pump Wavelength Absorb Pump Power Distribute Bragg Reflector Heat Sink Temperature
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