Abstract
Mid infrared semiconductor lasers that are based on population inversion between conduction subbands of a quantum well (QW) structure have attracted much attention recently. Faist el al [1] demonstrated the operation of the quantum cascade laser which is a unipolar intersubband injection laser Another scheme to generate population inversion between conduction subbands is by optical pumping [2], In this contribution we summarize our recent experimental and theoretical results including the observation of mid-infrared emission from a GaAs/AlGaAs coupled QWs (CQW) structure [3-4] (see Fig. 1).
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