TY - GEN
T1 - Two-wavelength quantum cascade lasers with heterogeneous cascades
AU - Straub, Axel
AU - Gmachl, Claire
AU - Mosely, Trinesha S.
AU - Colombelli, Raffaele
AU - Troccoli, Mariano
AU - Sivco, Deborah L.
AU - Sergent, A. Michael
AU - Capasso, Federico
AU - Cho, Alfred Y.
N1 - Publisher Copyright:
© 2002 IEEE.
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/84952661385
UR - https://www.scopus.com/pages/publications/84952661385#tab=citedBy
U2 - 10.1109/COMMAD.2002.1237212
DO - 10.1109/COMMAD.2002.1237212
M3 - Conference contribution
AN - SCOPUS:84952661385
T3 - Conference on Optoelectronic and Microelectronic Materials and Devices, Proceedings, COMMAD
SP - 141
EP - 144
BT - 2002 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2002 - Proceedings
A2 - Gal, Michael
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2002
Y2 - 11 December 2002 through 13 December 2002
ER -