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Excitation dependences of gain and carrier-induced refractive index change in quantum-dot lasers

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3 Author(s)
Lorke, M. ; Institute for Theoretical Physics, University of Bremen, 28334 Bremen, Germany ; Jahnke, F. ; Chow, W.W.

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The excitation-density dependence of optical gain and refractive index changes in quantum-dot active media is investigated on the basis of a microscopic theory. Carrier-carrier Coulomb interaction and carrier-phonon interaction are treated on the level of a quantum-kinetic description. In the range of small optical gain the authors find small values of the α factor, while in the regime of gain saturation |α| increases drastically.

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Applied Physics Letters  (Volume:90 ,  Issue: 5 )