Gain competition in dual wavelength quantum cascade lasers.
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.
Geiser
Markus
M
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
Pflügl
Christian
C
Belyanin
Alexey
A
Wang
Qi Jie
QJ
Yu
Nanfang
N
Edamura
Tadanaka
T
Yamanishi
Masamichi
M
Kan
Hirofumi
H
Fischer
Milan
M
Wittmann
Andreas
A
Faist
Jérôme
J
Capasso
Federico
F
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