Geiser, MarkusPflügl, ChristianBelyanin, AlexeyWang, Qi JieYu, NanfangEdamura, TadanakaYamanishi, MasamichiKan, HirofumiFischer, MilanWittmann, AndreasFaist, JérômeCapasso, Federico2017-07-112010Geiser, Markus, Christian Pflügl, Alexey Belyanin, Qi Jie Wang, Nanfang Yu, Tadanaka Edamura, Masamichi Yamanishi, et al. 2010. “Gain Competition in Dual Wavelength Quantum Cascade Lasers.” Optics Express 18 (10) (April 27): 9900. doi:10.1364/oe.18.009900.1094-4087http://nrs.harvard.edu/urn-3:HUL.InstRepos:33372438We 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.en-USJournal Article10.1364/OE.18.009900