High power GaInP/AlGaInP visible lasers (λ=646 nm) with narrow circular shaped far-field pattern

Abstract

GaInP/AlGaInP visible lasers based on a longitudinal photonic bandgap crystal waveguide emitting at 646 nm show narrow circular shaped far field pattern. Vertical and lateral beam divergence of about 8° (full width at half maximum) that is independent of injection current is demonstrated. Differential quantum efficiency is up to 85%. Pulsed total optical output power is as high as 20 W for 100 µm-wide stripe lasers and 6 W for 20 µm-wide stripe lasers. Such values of output optical power are 2.5 higher with respect to ones obtained for the lasers fabricated from the state-of-the-art epiwafers for commercial 650 nm range DVD lasers.