Single transverse mode 850 nm GaAs/AlGaAs lasers with narrow beam divergence

GaAs/AlGaAs 850 nm range lasers based on a longitudinal photonic bandgap crystal waveguide show narrow vertical far-field pattern. Vertical and lateral beam divergence with FWHM below 10deg and 5deg, respectively, is demonstrated for 4 mum stripe width, being independent on injection current. Excellent beam quality with M 2 =1.4, low internal losses of 1.4 cm -1 and high differential quantum efficiency of 83% are observed

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