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


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.


Poster