Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis

Rakić, Aleksandar, Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Dean, Paul, Indjin, Dragan, Ikonić, Zoran, Harrison, Paul, Valavanis, Alexander, Khanna, Suraj P., Lachab, Mohammad, Wilson, Stephen J., Linfield, Edmund H. and Davies, A. Giles (2013) Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis. Optics Express, 21 19: 22194-22205. doi:10.1364/OE.21.022194


Author Rakić, Aleksandar
Taimre, Thomas
Bertling, Karl
Lim, Yah Leng
Dean, Paul
Indjin, Dragan
Ikonić, Zoran
Harrison, Paul
Valavanis, Alexander
Khanna, Suraj P.
Lachab, Mohammad
Wilson, Stephen J.
Linfield, Edmund H.
Davies, A. Giles
Title Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis
Journal name Optics Express   Check publisher's open access policy
ISSN 1094-4087
Publication date 2013-09-12
Sub-type Article (original research)
DOI 10.1364/OE.21.022194
Open Access Status DOI
Volume 21
Issue 19
Start page 22194
End page 22205
Total pages 12
Editor Andrew M. Weiner
Place of publication Washington, DC, United States
Publisher Optical Society of America
Collection year 2014
Language eng
Formatted abstract
The terahertz (THz) frequency quantum cascade laser (QCL) is a compact source of high-power radiation with a narrow intrinsic linewidth. As such, THz QCLs are extremely promising sources for applications including high-resolution spectroscopy, heterodyne detection, and coherent imaging. We exploit the remarkable phase-stability of THz QCLs to create a coherent swept-frequency delayed self-homodyning method for both imaging and materials analysis, using laser feedback interferometry. Using our scheme we obtain amplitude-like and phase-like images with minimal signal processing. We determine the physical relationship between the operating parameters of the laser under feedback and the complex refractive index of the target and demonstrate that this coherent detection method enables extraction of complex refractive indices with high accuracy. This establishes an ultimately compact and easy-to-implement THz imaging and materials analysis system, in which the local oscillator, mixer, and detector are all combined into a single laser.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
School of Information Technology and Electrical Engineering Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 36 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 41 times in Scopus Article | Citations
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Created: Fri, 13 Sep 2013, 08:04:28 EST by Karl Bertling on behalf of School of Information Technol and Elec Engineering