@inproceedings{8d94c62c9e0b481d8e4b7864beb619f7,
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 cm1 (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 = "10.1364/acp.2011.83081r",
language = "English",
isbn = "9780819489616",
series = "2011 Asia Communications and Photonics Conference and Exhibition, ACP 2011",
publisher = "IEEE Computer Society",
booktitle = "2011 Asia Communications and Photonics Conference and Exhibition, ACP 2011",
note = "2011 Asia Communications and Photonics Conference and Exhibition, ACP 2011 ; Conference date: 13-11-2011 Through 16-11-2011",
}