title: Gain competition in dual wavelength quantum cascade lasers.
abstract: 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.
authors.affiliation: School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Markus
authors.initials: M
authors.lastname: Geiser
authors.forename: Christian
authors.initials: C
authors.lastname: Pflügl
authors.forename: Alexey
authors.initials: A
authors.lastname: Belyanin
authors.forename: Qi Jie
authors.initials: QJ
authors.lastname: Wang
authors.forename: Nanfang
authors.initials: N
authors.lastname: Yu
authors.forename: Tadanaka
authors.initials: T
authors.lastname: Edamura
authors.forename: Masamichi
authors.initials: M
authors.lastname: Yamanishi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kan
authors.forename: Milan
authors.initials: M
authors.lastname: Fischer
authors.forename: Andreas
authors.initials: A
authors.lastname: Wittmann
authors.forename: Jérôme
authors.initials: J
authors.lastname: Faist
authors.forename: Federico
authors.initials: F
authors.lastname: Capasso
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D011789:Quantum Theory; D012542:Scattering, Radiation