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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 10° and 5°, respectively, is demonstrated for 4 µm stripe width, being independent on injection current. Excellent beam quality with M2=1.4, low internal losses of 1.4 cm−1 and high differential quantum efficiency of 83% are observed.
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Kettler et al. (2006) studied this question.
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