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A 22-stage interband cascade laser with a "W" active region for enhanced gain has exhibited lasing at /spl lambda/=3.0 /spl mu/m. Threshold current densities are lower than the best reported intersubband quantum cascade laser results at all T up to the maximum lasing temperature of 225 K. At 100 K, output powers up to 430 mW are observed, and the slope of 274 mW/A per facet for high injection...
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