Gain recovery time in a terahertz quantum cascade laser

Abstract

The gain recovery time of a bound-to-continuum terahertz frequency quantum cascade laser, operating at 1.98 THz, has been measured using broadband terahertz-pump-terahertz-probe spectroscopy. The recovery time is found to reduce as a function of current density, attaining a value of 18 ps as the laser is brought close to threshold. We attribute this reduction to improved coupling efficiency between the injector state and the upper lasing level as the active region aligns.

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Item Type:	Article
Authors/Creators:	Bacon, DR Freeman, JR Mohandas, RA Li, L Linfield, EH Davies, AG Dean, P
Copyright, Publisher and Additional Information:	© 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
Dates:	Published: 22 February 2016 Accepted: 9 February 2016
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds)
Funding Information:	Funder Grant number EPSRC EP/J002356/1 Royal Society WM110032 EPSRC EP/J017671/1 Royal Society WM150029
Depositing User:	Symplectic Publications
Date Deposited:	07 Mar 2016 16:25
Last Modified:	23 Jun 2023 21:59
Published Version:	http://dx.doi.org/10.1063/1.4942452
Status:	Published
Publisher:	American Institute of Physics (AIP)
Identification Number:	10.1063/1.4942452
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:95558

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Gain recovery time in a terahertz quantum cascade laser

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