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By electrically segmenting an InP ridge laser and series-connecting the segments, we have created the first highly scalable bipolar cascade lasers. We report room-temperature continuous-wave operation of 12-stage lasers with a record 390% differential efficiency and 2.8-mA threshold, as well as three-stage lasers with 50-/spl Omega/ input impedance and 118% efficiency.
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Getty et al. (2003) studied this question.
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