Mid infrared semiconductor lasers that are based on population inversion between conduction subbands of a quantum well (QW) structure have attracted much attention recently. Recently demonstrated was 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. This contribution summarizes the recent experimental and theoretical results including the observation of mid-infrared emission from a GaAs/AlGaAs coupled QWs (CQW) structure. Based on the results, it is predict that the structures could be very effective for achieving almost complete population inversion and large stimulated gain.
|Original language||American English|
|Number of pages||1|
|State||Published - 1996|
|Event||Proceedings of the 1996 Conference on Lasers and Electro-Optics Europe, CLEO/Europe - Hamburg, Ger|
Duration: 8 Sep 1996 → 13 Sep 1996
|Conference||Proceedings of the 1996 Conference on Lasers and Electro-Optics Europe, CLEO/Europe|
|Period||8/09/96 → 13/09/96|