Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers

GRIER, Andrew, DEAN, Paul, VALAVANIS, Alexander, KEELEY, James, KUNDU, Iman, COOPER, Jonathan D, AGNEW, Gary, TAIMRE, Thomas, LIM, Yah Leng, BERTLING, Karl, RAKIC, Aleksander D, LI, Lianhe H, HARRISON, Paul, LINFIELD, Edmund H, IKONIC, Zoran, DAVIES, A. Giles and INDJIN, Dragan (2016). Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers. Optics Express, 24 (19), 21948-21956.

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Official URL: https://www.osapublishing.org/oe/abstract.cfm?uri=...
Link to published version:: 10.1364/OE.24.021948

Abstract

We explain the origin of voltage variations due to self-mixing in a terahertz (THz) frequency quantum cascade laser (QCL) using an extended density matrix (DM) approach. Our DM model allows calculation of both the current–voltage (I–V) and optical power characteristics of the QCL under optical feedback by changing the cavity loss, to which the gain of the active region is clamped. The variation of intra-cavity field strength necessary to achieve gain clamping, and the corresponding change in bias required to maintain a constant current density through the heterostructure is then calculated. Strong enhancement of the self-mixing voltage signal due to non-linearity of the (I–V) characteristics is predicted and confirmed experimentally in an exemplar 2.6 THz bound-to-continuum QCL.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre
Identification Number: 10.1364/OE.24.021948
Depositing User: Paul Harrison
Date Deposited: 19 Aug 2016 10:19
Last Modified: 04 Dec 2016 11:03
URI: http://shura.shu.ac.uk/id/eprint/13265

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