A study of the spatially resolved spectrum of individual emitters in a Y-junction laser array shows that the array is not completely locked. The use of an external cavity with a novel, customized spatial filter is demonstrated to yield a stable output beam, which increases from 1.25 times the diffraction limit at low power to 1.6 times the diffraction limit at 120 mW without shifting.
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Berger et al. (1988) studied this question.
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