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Proceedings Paper

Nonequilibrium Green's functions theory for the alpha factor of quantum cascade lasers (Conference Presentation)
Author(s): Mauro F. Pereira; David O. Winge; Andreas Wacker; Louise Jumpertz; Florian Michel; Robert Pawlus; Wolfgang E. Elsaesser; Kevin Schires; Mathieu Carras; Frédéric Grillot
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Paper Abstract

The linewidth of a conventional laser is due to fluctuations in the laser field due to spontaneous emission and described by the Schalow-Townes formula. In addition to that, in a semiconductor laser there is a contribution arising from fluctuations in the refractive index induced by carrier density fluctuations. The later are quantitatively described by the linewidth enhancement or alpha factor [C. H. Henry, IEEE J. Quantum Electron. 18 (2), 259 (1982), W. W. Chow, S. W. Koch and M. Sargent III, Semiconductor-Laser Physics, Springer-Verlag (1994), M.F. Pereira Jr et al, J. Opt. Soc. Am. B10, 765 (1993). In this paper we investigate the alpha factor of quantum cascade lasers under actual operating conditions using the Nonequilibrium Greens Functions approach [A. Wacker et a, IEEE Journal of Sel. Top. in Quantum Electron.,19 1200611, (2013), T. Schmielau and M.F. Pereira, Appl. Phys. Lett. 95 231111, (2009)]. The simulations are compared with recent results obtained with different optical feedback techniques [L. Jumpertz et al, AIP ADVANCES 6, 015212 (2016)].

Paper Details

Date Published: 3 November 2016
PDF: 1 pages
Proc. SPIE 9934, Terahertz Emitters, Receivers, and Applications VII, 993408 (3 November 2016); doi: 10.1117/12.2238619
Show Author Affiliations
Mauro F. Pereira, Sheffield Hallam Univ. (United Kingdom)
David O. Winge, Lund Univ. (Sweden)
Andreas Wacker, Lund Univ. (Sweden)
Louise Jumpertz, Télécom ParisTech (France)
mirSense (France)
Florian Michel, Technische Univ. Darmstadt (Germany)
Robert Pawlus, Technische Univ. Darmstadt (Germany)
Wolfgang E. Elsaesser, Technische Univ. Darmstadt (Germany)
Kevin Schires, Télécom ParisTech (France)
Mathieu Carras, mirSense (France)
Frédéric Grillot, Télécom ParisTech (France)
The Univ. of New Mexico (Uruguay)


Published in SPIE Proceedings Vol. 9934:
Terahertz Emitters, Receivers, and Applications VII
Manijeh Razeghi; Alexei N. Baranov; John M. Zavada; Dimitris Pavlidis, Editor(s)

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