Gain competition in multicolor Quantum Cascade Lasers
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We investigated dual-color mid-infrared quantum cascade lasers. We found that due to gain competition mid-infrared modes tend to start lasing in higher order lateral modes. The mid-infrared mode with the lower threshold current reduces population inversion for the second laser with the higher threshold current due to stimulated emission. A theoretical model describing this effect was developed, which is important for future device optimization. © 2009 Optical Society of America.
author list (cited authors)
Pfluegl, C., Geiser, M., Belyanin, A., Wang, Q. J., Yu, N., Edamura, T., ... IEEE, ..