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

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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. [Article]

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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.

More Information

Official URL:

https://www.osapublishing.org/oe/abstract.cfm?uri=...

Research Institute, Centre or Group - Does NOT include content added after October 2018:

Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre

Page Range:

21948-21956

Identifiers

Identification Number:

10.1364/OE.24.021948

ORCID for Paul Harrison: