@inproceedings{10c674ab277b4b0a85bf59be4fa3d720,
title = "Two-wavelength quantum cascade lasers with heterogeneous cascades",
abstract = "Quantum cascade (QC) lasers with a dual-wavelength interdigitated cascade are presented. Their active core consists of a stack of active regions and injectors emitting at 8.0 μm interleaved with a second stack emitting at 9, 5 μm. Laser action at two substantially different wavelengths is observed, demonstrating the viability of the {"}interdigitated cascade{"} approach for multi-wavelengti laser emission in the mid-infrared. This laser was also used to investigate the influence of the injector-doping on the device perfomance. Two QC lasers with different injector-doping levels were measured, in particular one only doped in the injectors bridging the 8.0 μm active region to the 9.5 μm active region and the remaining injectors undoped. A substantial reduction in threshold was observed for the laser wavelength with the undoped injector, confirming the significance of impurity scattering for the laser threshold in QC-lasers. Dual single-mode and tunable emission at two substantially different wavelength could be demonstrated with a QC laser emitting at 5.0 μm and 7.5 μm simultaneously. These lasers may be of interest for trace gas sensing, as the second wavelength could be used as in-built reference channel.",
author = "Axel Straub and Gmachl, {Claire F.} and Mosely, {Trinesha S.} and Raffaele Colombelli and Mariano Troccoli and Sivco, {Deborah L.} and Sergent, {A. Michael} and Federico Capasso and Cho, {Alfred Y.}",
year = "2002",
month = jan,
day = "1",
doi = "10.1109/COMMAD.2002.1237212",
language = "English (US)",
series = "Conference on Optoelectronic and Microelectronic Materials and Devices, Proceedings, COMMAD",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "141--144",
editor = "Michael Gal",
booktitle = "2002 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2002 - Proceedings",
address = "United States",
note = "Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2002 ; Conference date: 11-12-2002 Through 13-12-2002",
}