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The effect of injector barrier thickness and doping level on current transport and optical transition width in a λ∼8.0 μm quantum cascade structure

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6 Author(s)
Howard, S.S. ; Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA ; Howard, D.P. ; Franz, Kale ; Hoffman, Anthony
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We experimentally study the optical transition width and current transport properties of a set of λ∼8.0 μm quantum cascade (QC) structures with varying injector barrier thickness and doping level. For this high-performance QC laser structure, a 50% reduction in doping level and a 33% reduction in injection barrier thickness yield five times stronger luminescence, 20% smaller optical transition linewidth, and improved current-voltage characteristics. These results demonstrate how high-performance QC laser structures can be engineered to produce narrow gain spectra at and above room temperature.

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Applied Physics Letters  (Volume:93 ,  Issue: 19 )