Zobrazeno 1 - 7 of 7 pro vyhledávání: '"Rikard Nelander"'
1
Temperature degradation of the gain transition in terahertz quantum cascade lasers – the role of acoustic phonon scattering
Autor: Andreas Wacker, Rikard Nelander
Publikováno v: physica status solidi c. 6:579-582
The temperature degradation in terahertz quantum cascade lasers is investigated with the focus on the role acoustic phonon scattering. A self-energy describing the electron-acoustic phonon interaction is derived and used to study the importance in tr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a13b98d9608d422826ebad6eb97689a
https://doi.org/10.1002/pssc.200880318
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2
Simulation of gain in quantum cascade lasers
Autor: Andreas Wacker, Carsten Weber, Rikard Nelander
The gain profile of a quantum cascade laser is strongly influenced by the lifetime of the carriers in the upper and lower laser state. The quantitative description of gain within the concept of nonequilibrium Green's functions allows for a detailed u
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5dd7804a3d3e2caa1a61bc11ab4a9579
https://lup.lub.lu.se/record/1515641
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3
The alpha factor of a quantum cascade laser
Autor: Andreas Wacker, Rikard Nelander, Mauro Pereira
Publikováno v: 2008 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD).
A nonequilibrium Keldysh Green's functions formalism is used to calculate the linewidth enhancement factor (alpha-factor) of a quantum cascade laser under operating conditions.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::55563d416764afe0b1b81c74a75745e8
https://doi.org/10.1109/nusod.2008.4668270
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4
Temperature dependence of the gain profile for THz quantum cascade lasers
Autor: Rikard Nelander, Andreas Wacker
Publikováno v: Applied Physics Letters; 92(8), pp 1-081102 (2008)
We study the rapid decrease of peak gain in resonant-phonon THz Quantum Cascade Lasers with increasing temperature. The effect of various microscopic scattering processes on the gain profile as a function of temperature is discussed. We argue that in
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f6a13cf10e57bb1070aae356c44e8deb
http://lup.lub.lu.se/record/1023926
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5
Probing the electronic and optical properties of quantum cascade lasers under operating conditions
Autor: R. J. Airey, J.S. Roberts, Dmitry G. Revin, Andrey B. Krysa, M. R. Soulby, John W. Cockburn, Andreas Wacker, Mauro Pereira, Rikard Nelander
Publikováno v: SPIE Proceedings.
We report the realisation of spectroscopic broadband transmission experiments on quantum cascade lasers (QCLs) under continuous wave operating conditions for drive currents up to laser threshold. This technique allows, for the first time, spectroscop
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c6559be4b526d94f6a870ba6f3d57de5
https://doi.org/10.1117/12.692334
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6
Temperature dependence and screening models in quantum cascade structures
Autor: Rikard Nelander, Andreas Wacker
Publikováno v: Journal of Applied Physics; 106(6), no 063115 (2009)
Different screening models in quantum cascade lasers are compared by calculating the contribution of intra-subband impurity scattering to the optical linewidth as a function of temperature. We find a strong impact of impurity scattering which is incr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d61138d55720729f6558a27881609a0
https://doi.org/10.1063/1.3226072
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