Feedback interferometry and diffuse reflectance imaging with terahertz quantum cascade lasers
Valavanis, A, Dean, P, Lim, YL et al. (10 more authors)
Feedback interferometry and diffuse reflectance imaging with terahertz quantum cascade lasers.
In:
UNSPECIFIED
NATO Advanced Research Workshop on Detection of Explosives and CBRN (Using Terahertz), Cesme, Izmir, Turkey.
Abstract
We demonstrate security-relevant imaging and sensing techniques that exploit the intense coherent THz emission from quantum-cascade lasers (QCLs). Imaging and spectral discrimination (in the 3–3.4 THz range) between visibly-concealed powdered compounds is achieved through diffuse-reflectance imaging using a frequency-switchable THz QCL. Feedback-interferometry techniques are used to perform imaging and surface-profiling at 2.6 THz with no need for any external radiation detector. This coherent (homodyne) detection scheme allows THz imaging at round-trip distances of > 20 m through air, or with resolutions of ~200 μm.
Metadata
Item Type:
Proceedings Paper
Authors/Creators:
Valavanis, A
Dean, P
Lim, YL
Alhathlool, R
Burnett, AD
Chowdhury, S
Kliese, R
Nikolic, M
Khanna, SP
Lachab, M
Rakic, A
Davies, AG
Linfield, EH
Copyright, Publisher and Additional Information:
(c) 2012, NATO. Reproduced with permission from the copyright holder.
CORE (COnnecting REpositories)
CORE (COnnecting REpositories)