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Five optically coupled narrow stripe (3.5 μm) GaAs/GaAlAs semiconductor lasers on 8-μm centers are operated as a spatially coherent phase-locked laser array. Output beams with less than 2° divergence are observed up to 60 mW/facet output with a quantum efficiency of greater than 25%/facet. Significant nonlinearities do not appear until well over 100 mW/facet output.
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Scifres et al. (1978) studied this question.
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