A quantum cascade laser is a very unique semiconductor laser that has been first demonstrated at Bell Laboratories in 1994.
Wikipedia has some nice information on QCLs: Quantum cascade laser
This video (mpg4, 23 MB) shows how a QCL works. The first 10 seconds summarize the features of our software, the remaining 20 seconds show the animated simulation results. At 20 seconds, the QCL starts to lase: The electron density (figure on the right) shows the population inversion, i.e. the higher state has a larger electron population than the lower lasing state.
Information on nextnano software for QCLs
A good introduction into the nextnano.NEGF software is the tutorial talk Modeling electron transport in quantum cascade lasers given by Thomas Grange at the International Quantum Cascade Laser School and Workshop (Cassis/France, 2018).
If you are interested in further tutorials, please contact stefan.birner [at] nextnano.com.
This figure shows the calculated electron density in a THz QCL.
This figure shows the calculated gain of a THz QCL.
nextnano software for quantum transport
Download nextnano.NEGF including an evaluation license.
Download nextnano.MSB including an evaluation license until 2016-12-31.
2) nextnano3 & nextnano++
The following two papers give a very basic introduction to QCL modeling.
Our recent publications on QCL modeling: