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Theoretical calculation of lasing spectra of quantum-dot lasers: effect of homogeneous broadening of optical gain

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2 Author(s)
A. Sakamoto ; Dept. of Appl. Phys., Tokyo Univ., Japan ; M. Sugawara

A theoretical calculation is presented for the effect of homogeneous broadening of optical gain on lasing spectra of quantum-dot lasers. Based on a coupled set of rate equations considering both the size distribution of quantum dots and a series of longitudinal cavity modes, we show that dots with different energies start lasing independently due to their spatial localization when the gain spectrum is a delta-like function, and that the dot ensemble contributes to a narrow-line lasing collectively under large homogeneous broadening. The result explains quite excellently the experimental lasing spectra found in self-assembled InGaAs-GaAs quantum-dot lasers.

Published in:

IEEE Photonics Technology Letters  (Volume:12 ,  Issue: 2 )