Nonequilibrium Green's functions theory for the alpha factor of quantum cascade lasers
(Conference Presentation)

Mauro F. Pereira; David O. Winge; Andreas Wacker; Louise Jumpertz; Florian Michel; Robert Pawlus; Wolfgang E. Elsaesser; Kevin Schires; Mathieu Carras; Frédéric Grillot

doi:10.1117/12.2238619

3 November 2016 Nonequilibrium Green's functions theory for the alpha factor of quantum cascade lasers (Conference Presentation)

Mauro F. Pereira, David O. Winge, Andreas Wacker, Louise Jumpertz, Florian Michel, Robert Pawlus, Wolfgang E. Elsaesser, Kevin Schires, Mathieu Carras, Frédéric Grillot

Author Affiliations +

Proceedings Volume 9934, Terahertz Emitters, Receivers, and Applications VII; 993408 (2016) https://doi.org/10.1117/12.2238619
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

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)].

Conference Presentation

Citation Download Citation

Mauro F. Pereira, David O. Winge, Andreas Wacker, Louise Jumpertz, Florian Michel, Robert Pawlus, Wolfgang E. Elsaesser, Kevin Schires, Mathieu Carras, and Frédéric Grillot "Nonequilibrium Green's functions theory for the alpha factor of quantum cascade lasers (Conference Presentation)", Proc. SPIE 9934, Terahertz Emitters, Receivers, and Applications VII, 993408 (3 November 2016); https://doi.org/10.1117/12.2238619

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