Journal
OPTICS EXPRESS
Volume 18, Issue 10, Pages 9900-9908Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.009900
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We investigated dual wavelength mid-infrared quantum cascade lasers based on heterogeneous cascades. We found that due to gain competition laser action tends to start 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. We developed a rate equation model to quantitatively describe mode interactions due to mutual gain depletion. (C) 2010 Optical Society of America
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