Multimode RNGH instabilities of Fabry-Pérot cavity QCLs: impact of diffusion

  • N. Vukovic
  • J. Radovanovic
  • V. Milanovic
  • D. L. Boiko
Part of the following topical collections:
  1. Advances in the Science of Light


We analyze multimode instabilities in Fabry-Pérot (FP) cavity MIR quantum cascade lasers (QCLs) caused by excitation of Rabi oscillations. Our analysis differs from previous treatments of this problem by inclusion of the grating of medium polarization (coherence grating) and its relaxation due to carrier diffusion. We show that low-threshold multimode Risken-Nummedal-Graham-Haken (RNGH) instabilities are possible in QCLs without a built-in saturable absorber, that is, in the configuration in which they have been experimentally observed. We also show that multimode RNGH instabilities are practically impossible in conventional VIS–NIR semiconductor quantum well laser diodes with a monolithic FP cavity. These explanations are supported by Lyapunov stability analysis and numerical simulations based on a travelling wave rate equation model.


Quantum cascade laser Self-oscillations Multimode instabilities 



The authors acknowledge support from Swiss National Science Foundation (project FASTIQ), Ministry of Education, Science and Technological Development (Republic of Serbia), ev. no. III 45010, COST ACTIONs BM1205 and MP1204 as well as the European Union’s Horizon 2020 research and innovation programme under the grant agreement No 686731 (SUPERTWIN).


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.School of Electrical EngineeringUniversity of BelgradeBelgradeSerbia
  2. 2.Centre Suisse d’Électronique et de Microtechnique (CSEM)NeuchâtelSwitzerland

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