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Nonlinear response of quantum cascade structures

Winge, David LU ; Franckie, Martin LU and Wacker, Andreas LU (2012) In Applied Physics Letters 101(21).
Abstract
The gain spectrum of a terahertz quantum cascade laser is analyzed by a nonequilibrium Green's functions approach. Higher harmonics of the response function were retrievable, providing a way to approach nonlinear phenomena in quantum cascade lasers theoretically. Gain is simulated under operation conditions and results are presented both for linear response and strong laser fields. An iterative way of reconstructing the field strength inside the laser cavity at lasing conditions is described using a measured value of the level of the losses of the studied system. Comparison with recent experimental data from time-domain-spectroscopy indicates that the experimental situation is beyond linear response.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics Letters
volume
101
issue
21
publisher
American Institute of Physics
external identifiers
  • wos:000311477600013
  • scopus:84869990285
ISSN
0003-6951
DOI
10.1063/1.4767373
language
English
LU publication?
yes
id
4732fb13-748c-4cdd-8541-42642d65759a (old id 3359735)
date added to LUP
2013-02-07 11:42:49
date last changed
2017-10-29 03:18:56
@article{4732fb13-748c-4cdd-8541-42642d65759a,
  abstract     = {The gain spectrum of a terahertz quantum cascade laser is analyzed by a nonequilibrium Green's functions approach. Higher harmonics of the response function were retrievable, providing a way to approach nonlinear phenomena in quantum cascade lasers theoretically. Gain is simulated under operation conditions and results are presented both for linear response and strong laser fields. An iterative way of reconstructing the field strength inside the laser cavity at lasing conditions is described using a measured value of the level of the losses of the studied system. Comparison with recent experimental data from time-domain-spectroscopy indicates that the experimental situation is beyond linear response.},
  articleno    = {211113},
  author       = {Winge, David and Franckie, Martin and Wacker, Andreas},
  issn         = {0003-6951},
  language     = {eng},
  number       = {21},
  publisher    = {American Institute of Physics},
  series       = {Applied Physics Letters},
  title        = {Nonlinear response of quantum cascade structures},
  url          = {http://dx.doi.org/10.1063/1.4767373},
  volume       = {101},
  year         = {2012},
}