Quantitative Modeling of Gain in Quantum Cascade Lasers under Operational Intensities

Research output: ThesisDoctoral Thesis (compilation)

Abstract

This thesis adresses modeling of quantum cascade lasers using non-equilibrium Green’s functions. Focus lies on the quantitative modeling of the gain when the systems are exposed to strong laser fields, as under realistic opertional conditions. In the first part, an introduction to the general concepts is provided, together with a discussion on approximate analytic expressions. The second part consists of the six papers listed below.
Paper I analyzes the temperature dependence of the gain and current of a terahertz quantum cascade laser.
Paper II provides details of the implementiation of the non-equilibriun Green’s function formalism for simulations of transport in quantum cascade lasers.
Paper III demonstrates a microscopic approach to simulate the second harmonic generation of a mid-IR quantum cascade laser.
Paper IV documents the implementation of a rudimentary form of the GW-approximation for the electron-electron scattering self-energy.
Paper V analyzes a proposed gain mechanism in superlattices, and presents an optimized structure plausible for laser operation.
Paper VI shows simulation results of 16 samples from 5 different laboratories. From this systematic study, trends with repspect to the growth place are identified.

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Condensed Matter Physics

Keywords

  • non-linear response, quantum cascade lasers, modelling, Non-equilibrium Green's functions, Gain clamping, Fysicumarkivet A:2016:Winge
Original languageEnglish
QualificationDoctor
Supervisors/Assistant supervisor
Award date2016 Nov 25
Place of PublicationLund
Publisher
  • Lund University, Faculty of Science, Department of Physics, Division of Mathematical Physics
Print ISBNs978-91-7753-046-6
Electronic ISBNs978-91-7753-047-3
Publication statusPublished - 2016 Nov
Publication categoryResearch

Bibliographic note

Defence details Date: 2016-11-25 Time: 13:15 Place: Physicum, Rydberg Lecture Hall, Sölvegatan 14A, Lund External reviewer(s) Name: Khurgin, Jacob B. Title: Professor Affiliation: Johns Hopkins University, Baltimore, USA ---

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David O. Winge, Franckié, M., Claudio Verdozzi, Andreas Wacker & Pereira, M. F., 2016 Apr 12, In : Journal of Physics: Conference Series. 696, 1, 012013.

Research output: Contribution to journalArticle

David O. Winge, Franckié, M. & Andreas Wacker, 2016 Apr 1, In : AIP Advances. 6, 4, 045025.

Research output: Contribution to journalArticle

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