Data are presented on operation of 100 μm aperture gain-guided single quantum well laser diodes in an external grating cavity. A maximum power of 550 mW is coupled out of the cavity with an efficiency of 0.51 W/A. The laser emission has a linewidth of ≲1 Å and is tunable from 7950 to 8450 Å for the specific laser diodes used in this study. The output beam is collimated in the direction perpendicular to the p-n junction, and exhibits a divergence of 0.4° parallel to the p-n junction.
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Gavrilovič et al. (1991) studied this question.
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