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We report recent developments on 980-nm single-transverse-mode ridge-waveguide (RW) lasers with high efficiency and low-vertical divergence. RW lasers fabricated with 7-$\mu \text{m}$ -wide ridge and 3-mm-long cavity achieve 2-W optical power, 59% maximum power conversion efficiency, as well as a beam divergence of 7.2° in lateral and 10.3° in vertical under 1.5-A injection current. The lateral beam...
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