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A periodic, grating-like array of substrate grooves oriented parallel to the longitudinal axis of the laser provides a small periodic lateral thickness modulation of the active region of an MO-CVD-grown Ga1−xAlxAs laser producing phase-locked operation at 7680 Å. CW output powers as high as 138 mW/facet have been obtained.
Scifres et al. (1982) studied this question.
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