Quantum cascade lasers

A quantum cascade laser is a very unique semiconductor laser that has been first demonstrated at Bell Laboratories in 1994.

Quantum cascade laser

QCL

 

Wikipedia has some nice information on QCLs: Quantum cascade laser


Download nextnano.QCL software

nextnano.QCL

  • Nonequilibrium Green's function (NEGF) method for calculating I-V curves and gain
  • NEGF quantum transport based on the code written by Thomas Grange
  • Documentation
  • Download nextnano.QCL including an evaluation license for a few months.

Download

Video

Quantum Cascade Laser Video

 

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.


nextnano leaflet on QCL simulations

Information on nextnano software for QCLs (pdf):

Download


Presentation

A good introduction into the nextnano.QCL 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).

Download


Tutorials

If you are interested in further tutorials, please contact stefan.birner [at] nextnano.com.


Results

QCL

This figure shows the calculated electron density in a THz QCL.


Gain of a QCL

This figure shows the calculated gain of a THz QCL.


Features

Electron and current density of a QCL

nextnano software for QCLs

1) nextnano.QCL

  • Nonequilibrium Green's function (NEGF) method for calculating I-V curves and gain
  • NEGF quantum transport based on the code written by Thomas Grange
  • Documentation
  • Download nextnano.QCL including an evaluation license.

    Download

nextnano.MSB

  • Nonequilibrium Green's function (NEGF) method for calculating I-V curves and gain based on the multi-scattering Büttiker probe model (MSB)
  • NEGF quantum transport based on the MSB method (code written by Peter Greck)
  • nextnano.MSB
  • Download nextnano.MSB including an evaluation license until 2016-12-31.

    Download

 

2) nextnano3 & nextnano++

  • self-consistent Schrödinger and Poisson equations
  • 8x8 k.p Schrödinger equation
  • strain
  • Documentation (nextnano3)
  • Documentation (nextnano++)

Publications

The following two papers give a very basic introduction to QCL modeling.

Our recent publications on QCL modeling:


Poster