This work describes the work performed by the author at the ETH Zurich, under the supervision of Prof. Jerome Faist on the optimization of high performance quantum cascade lasers (QCLs) in the Mid-IR spectral region. The main factors influencing laser performance have therefore been analyzed. In particular the optimization of the laser design in order to improve the electron tranport and the optical gain. In addition a detailed analysis of the fabrication process is performed and a novel process scheme is presented for buried heterostructure lasers.

Autorentext

Dr. Alfredo Bismuto has obtained his MSc in physics with honours in July 2006 at University of Naples "Federico II", Italy. From 2007 to 2011 he carried out a PhD in the group of Prof. Jerome Faist at ETH Zurich, his work was focused on the optimization of high performance quantum cascade lasers in the Mid-IR spectral region.