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Demonstration of a self-mixing displacement sensor based on terahertz quantum cascade lasers

Lim, YL, Dean, P, Nikoli, M, Kliese, R, Khanna, SP, Lachab, M, Valavanis, A, Indjin, D, Ikonic, Z, Harrison, P, Linfield, EH, Davies, AG, Wilson, SJ and Rakic, AD (2011) Demonstration of a self-mixing displacement sensor based on terahertz quantum cascade lasers. Applied Physics Letters, 99 (8). 081108 - 081108 . ISSN 00036951


There has been growing interest in the use of terahertz (THz) quantum cascade lasers (QCLs) for sensing applications. However, the lack of compact and sensitive THz detectors has limited the potential for commercial exploitation of sensors based on these devices. We have developed a self-mixing sensing technique in which THz QCLs are used for both generation and interferometric sensing of THz radiation, eliminating the need for a separate detector. Using this technique, we have measured the displacement of a remote target, both with and without opaque (in the visible spectrum) materials in the beam path and demonstrated a stand-off distance of up to 7 m in air.

Item Type: Article
Keywords: displacement measurement, light interferometry, measurement by laser beam, microwave photonics, optical sensors, quantum cascade lasers, terahertz wave detectors, visible spectra
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Microwaves and Photonics (Leeds)
Depositing User: Symplectic Publications
Date Deposited: 28 Nov 2011 16:10
Last Modified: 15 Sep 2014 03:54
Published Version: http://dx.doi.org/doi/10.1063/1.3629991
Status: Published
Publisher: AIP
Refereed: Yes
Identification Number: 10.1063/1.3629991
URI: http://eprints.whiterose.ac.uk/id/eprint/43220

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