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We report a tenfold increase in the lasing output of single-output Y-junction semiconductor ring lasers by reducing the end-facet reflection feedback. Controlled reflection feedback is also shown to be a means for promoting unidirectional lasing in dual-output ring lasers. Finally, we show that the counterpropagating ring modes are strongly coupled by gain competition.
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Hohimer et al. (1992) studied this question.
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