Regensburg 1998 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 6: Symposium: Blaue Halbleiterlaser

HL 6.3: Fachvortrag

Montag, 23. März 1998, 11:30–12:00, H1

Many-Body Theory for II-VI Semiconductor Laser Media — •K. Henneberger, H. G"uldner, G. Manzke, Q.Y. Peng, and M.F. Pereira, Jr. — Fachbereich   Physik, Universit"at   Rostock, D-18051 Rostock, Germany

Technical progress in the construction of novel blue-green emitting diode lasers has been astounding within the last few years, and II-VI semiconductor heterostructures are one of the most investigated gain media for that purpose. We demonstrate the interplay between resonant cavity, carrier-quantum confinement and Coulomb effects by means of our Keldysh Green’s function approach which treats the relevant quasi-particles (photons, carriers and plasmons) within the same fully quantum-mechanical footing. Numerical results for stationary laser action for a variety of II-VI heterostructures under quasi-equilibrium conditions and for temperatures ranging from 100K to 300K are compared with recent experimental findings [1]. We are able to consistently describe the gain lineshape and spectral position of lasing as well as the strong influence of inhomogeneous broadening in the spectra. The dynamics, particularly the switching behavior of the laser emission is characterized by both spectral and temporal oscillations appearing as the consequence of the interplay between the cooling of generated hot carriers and heating of the plasma due to the laser emission itself [2].

[1] P. Michler, et al, to appear in Journal of Crystal Growth, (1998).

[2] P. Michler, et al, to appear in phys. stat. sol. (b) 205, (1998).