Abstract
Summary form only given. High power, room temperature operation of a DFB quantum cascade (QC) laser emitting at /spl lambda//spl sim/5 /spl mu/m has recently been reported. This laser is based on a vertical transition and is optimized for high temperature operation by a design that reduces thermal backfilling and enhances injection efficiency-through a funnel injector and a so-called three well active region.
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