A model for a pulsed terahertz quantum cascade laser under optical feedback

AGNEW, Gary, GRIER, Andrew, TAIMRE, Thomas, LIM, Yah Leng, BERTLING, Karl, IKONIC, Zoran, VALAVANIS, Alexander, DEAN, Paul, COOPER, Jonathan, KHANNA, Suraj P, LACHAB, Mohammad, LINFIELD, Edmund H, DAVIES, A. Giles, HARRISON, Paul, INDJIN, Dragan and RAKIC, Aleksandar (2016). A model for a pulsed terahertz quantum cascade laser under optical feedback. Optics Express, 24 (18), 20554-20170.

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Official URL: https://www.osapublishing.org/oe/abstract.cfm?uri=...
Link to published version:: 10.1364/OE.24.020554

Abstract

Optical feedback effects in lasers may be useful or problematic, depending on the type of application. When semiconductor lasers are operated using pulsed-mode excitation, their behavior under optical feedback depends on the electronic and thermal characteristics of the laser, as well as the nature of the external cavity. Predicting the behavior of a laser under both optical feedback and pulsed operation therefore requires a detailed model that includes laser-specific thermal and electronic characteristics. In this paper we introduce such a model for an exemplar bound-to-continuum terahertz frequency quantum cascade laser (QCL), illustrating its use in a selection of pulsed operation scenarios. Our results demonstrate significant interplay between electro-optical, thermal, and feedback phenomena, and that this interplay is key to understanding QCL behavior in pulsed applications. Further, our results suggest that for many types of QCL in interferometric applications, thermal modulation via low duty cycle pulsed operation would be an alternative to commonly used adiabatic modulation.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre
Identification Number: 10.1364/OE.24.020554
Depositing User: Paul Harrison
Date Deposited: 26 Jul 2016 09:41
Last Modified: 09 Dec 2016 04:42
URI: http://shura.shu.ac.uk/id/eprint/12948

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