Nonequilibrium theory for gain in quantum cascade lasers

Author

Periera, M.F. ; Lee, S.-C. ; Wacker, A.

Author_Institution

NMRC, Univ. Coll. Cork, Ireland

fYear

2003

fDate

14-16 Oct. 2003

Firstpage

5

Lastpage

6

Abstract

A nonequilibrium theory for gain in quantum cascade lasers is presented. Optical absorption α at a given photon energy is calculated from the imaginary part of the optical susceptibility. The occupation functions for each electronic subband are calculated from the diagonal terms in the carrier Green´s functions (which are expanded in terms of Wannier-Stark states), and obtained by self-consistent solutions of Dyson equations. Scattering with phonons and impurities are included in the relevant self-energies. The resulting integral equation and gain spectra is shown.

Keywords

Green´s function methods; Wannier functions; absorption coefficients; laser theory; nonlinear optical susceptibility; phonon-impurity interactions; quantum cascade lasers; Dyson equations; Green functions; Wannier-Stark states; electronic subband; gain spectra; nonequilibrium theory; optical absorption; optical susceptibility; phonon-impurity scattering; photon energy; quantum cascade lasers; Absorption; Analog integrated circuits; Educational institutions; Green´s function methods; Impurities; Optical scattering; Particle scattering; Phonons; Quantum cascade lasers; Quantum mechanics;

fLanguage

English

Publisher

ieee

Conference_Titel

Numerical Simulation of Semiconductor Optoelectronic Devices, 2003. NUSOD 2003. Proceedings of the IEEE/LEOS 3rd International Conference on

Print_ISBN

0-7803-7992-6

Type

conf

DOI

10.1109/NUSOD.2003.1259026

Filename

1259026