The quantum cascade laser: A versatile high-power semiconductor laser for mid-infrared applications
Article first published online: 17 NOV 2005
© 2005 Lucent Technologies Inc.
Bell Labs Technical Journal
Special Issue: Nanotechnology
Volume 10, Issue 3, pages 199–214, Autumn (Fall) 2005
How to Cite
Malis, O., Gmachl, C., Sivco, D. L., Pfeiffer, L. N., Sergent, A. M. and West, K. W. (2005), The quantum cascade laser: A versatile high-power semiconductor laser for mid-infrared applications. Bell Labs Tech. J., 10: 199–214. doi: 10.1002/bltj.20114
- Issue published online: 17 NOV 2005
- Article first published online: 17 NOV 2005
- Manuscript Accepted: MAY 2005
Since its invention at Bell Labs in the mid-nineties, the quantum cascade laser (QCL) has evolved rapidly to become a viable commercial alternative to other solid-state mid-infrared light sources. QCLs are compact, high-power, wavelength-agile laser devices that are ideally suited for mid-infrared applications such as chemical sensing and free-space telecommunications. This paper summarizes our recent progress in QCL technology, with a particular emphasis on device design and fabrication. The current state-oftheart in performance of InP lattice-matched QCL is reviewed. In order to expand the functionality of QCLs, new materials and device concepts are being explored. In particular, nonlinear light generation in QCLs is discussed in detail. The experimental results confirm the potential of nonlinear QCLs to extend the wavelength range of InP-based devices. Ongoing efforts to improve the fabrication of InP-based QCLs and to develop new QCL materials are presented. © 2005 Lucent Technologies Inc.