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Proceedings Paper

Design issues and physics for power scaling of quantum-cascade lasers
Author(s): W. T. Masselink; M. P. Semtsiv; Y. V. Flores; A. Aleksandrova; J. Kischkat
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Paper Abstract

The quantum-cascade laser (QCL) emitting in the mid-infrared region of 4 to 8 m has been refined to the point that its internal quantum efficiency is approaching fundamental limits. QCLs designed for power typically contain 30-40 cascades, are less than two wavelengths in width, and laser ridge lengths are typically between 3 and 6 mm. Even with state-of-the-art efficiency and thermal management, room temperature operation of such lasers is fundamentally limited to several watts. This paper describes a path to power scaling that is not fundamentally limited. Power requires volume and thermal conductance. We propose that this combination is best achieved using fewer than 15 cascades combined with broad areas. We demonstrate the first room temperature continuous-wave emission of broad-area QCLs and discuss how this scaling concept can deliver MIR emission of 10's of watts at room temperature with beam quality required for high brilliance.

Paper Details

Date Published: 21 October 2016
PDF: 9 pages
Proc. SPIE 9989, Technologies for Optical Countermeasures XIII, 99890B (21 October 2016); doi: 10.1117/12.2241431
Show Author Affiliations
W. T. Masselink, Humboldt-Univ. zu Berlin (Germany)
M. P. Semtsiv, Humboldt-Univ. zu Berlin (Germany)
Y. V. Flores, Humboldt-Univ. zu Berlin (Germany)
A. Aleksandrova, Humboldt-Univ. zu Berlin (Germany)
J. Kischkat, Humboldt-Univ. zu Berlin (Germany)

Published in SPIE Proceedings Vol. 9989:
Technologies for Optical Countermeasures XIII
David H. Titterton; Robert J. Grasso; Mark A. Richardson, Editor(s)

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