Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer

We propose a laser feedback interferometer operating at multiple terahertz (THz) frequency bands by using a pulsed coupled-cavity THz quantum cascade laser (QCL) under optical feedback. A theoretical model that contains multi-mode reduced rate equations and thermal equations is presented, which capt...

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Published in:Optics express 2017-05, Vol.25 (9), p.10153-10165
Main Authors: Qi, Xiaoqiong, Agnew, Gary, Kundu, Iman, Taimre, Thomas, Lim, Yah Leng, Bertling, Karl, Dean, Paul, Grier, Andrew, Valavanis, Alexander, Linfield, Edmund H, Giles Davies, A, Indjin, Dragan, Rakić, Aleksandar D
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cited_by cdi_FETCH-LOGICAL-c329t-7bb6379db64319c79baa1715fd4e76456a5fedb0336c5968a687ca5d79778d463
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container_end_page 10165
container_issue 9
container_start_page 10153
container_title Optics express
container_volume 25
creator Qi, Xiaoqiong
Agnew, Gary
Kundu, Iman
Taimre, Thomas
Lim, Yah Leng
Bertling, Karl
Dean, Paul
Grier, Andrew
Valavanis, Alexander
Linfield, Edmund H
Giles Davies, A
Indjin, Dragan
Rakić, Aleksandar D
description We propose a laser feedback interferometer operating at multiple terahertz (THz) frequency bands by using a pulsed coupled-cavity THz quantum cascade laser (QCL) under optical feedback. A theoretical model that contains multi-mode reduced rate equations and thermal equations is presented, which captures the interplay between electro-optical, thermal, and feedback effects. By using the self-heating effect in both active and passive cavities, self-mixing signal responses at three different THz frequency bands are predicted. A multi-spectral laser feedback interferometry system based on such a coupled-cavity THz QCL will permit ultra-high-speed sensing and spectroscopic applications including material identification.
doi_str_mv 10.1364/OE.25.010153
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title Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer
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