@inproceedings{67ebe860566f41f5bed92b0074ef7410,
title = "Broad gain injectorless quantum-cascade lasers with low threshold emitting around 8.6 μm",
abstract = "Broad gain lasers attract much interest due to the practical gas sensing applications. A step well structure with double optical transitions is implemented in the active region of injectorless quantum-cascade lasers (QCLs) to achieve extended gain bandwidth. The step well is constructed by a {"}short period superlattice{"} which provides an equivalent GaInAlAs alloy quantum step well in each active module. The fabricated devices show an ultrabroadband gain spectrum of 480 cm-1 (4 μm) at room temperature in pulsed mode. The laser threshold current density is as low as 1.1 kA/cm 2 which is the lowest among the broad gain QCLs emitting at similar wavelengths and the slope efficiency is 1.6 W/A at room temperature.",
keywords = "Gain bandwidth, Injectorless, Mid-infrared, Quantum-cascade laser",
author = "Hua Li and Simeon Katz and Gerhard Boehm and Amann, \{Markus Christian\}",
year = "2011",
doi = "10.1117/12.917908",
language = "English",
isbn = "9780819489562",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Optoelectronic Materials and Devices VI",
note = "Optoelectronic Materials and Devices VI ; Conference date: 13-11-2011 Through 16-11-2011",
}