The quantum-cascade (QC) laser with heterogeneous cascades were discussed. It was found that in this type of heterogeneous cascade, it was not necessary to adjust the design electric field of the two stacks to match each other and each substack was apportioned the appropriate fraction of the total applied bias. The analysis showed that the low-temperature threshold current densities were 2.67 and 2.70 kA cm2.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering