The effects of multiply quantum wells (MQW) on optical and electrical   characteristics of AlGaAs lasers with separate confinement heterostructures   (SCH)
  Optical and electrical characteristics of AlGaAs lasers with separate confinement heterostructures are modeled by using Synopsys's Sentaurus TCAD, and open source software. The results for cases of 2-QW (2 Quantum Wells) and 3-QW structures are compared with these for 1-QW. A significant improvement of useful laser parameters is obtained by increasing the number of Quantum Wells and optimizing the width of waveguides. In particular, the maximum optical efficiency is shown to reach 88% for a 3-QW structure with optimal width of waveguides. The width of optical intensity profile of MQW lasers increases, leading to lowering maximal light power density passing through laser facets, decreasing the risk of catastrophic damage of mirrors. 
Z. Koziol and S. I. Matyukhin
cond-mat.mtrl-sci