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Conferences > CLEO > 2010 > CThE > CThE4

Gain competition in multicolor Quantum Cascade Lasers

C. Pflügl, M. Geiser, A. Belyanin, Q. J. Wang, N. Yu, T. Edamura, M. Yamanishi, H. Kan, M. Fischer, A. Wittmann, J. Faist, and Federico Capasso

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Abstract

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.

© 2010 Optical Society of America

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