Self-mixing interferometry with terahertz quantum cascade lasers

Valavanis, Alex, Dean, Paul, Lim, Yah Leng, Alhathlool, Raed, Nikolić, Milan, Kliese, Russell, Khanna, Suraj P., Indjin, Dragan, Wilson, Stephen J., Rakić, Aleksandar D., Linfield, Edmund H. and Davies, Giles (2013) Self-mixing interferometry with terahertz quantum cascade lasers. IEEE Sensors Journal, 13 1: 37-43. doi:10.1109/JSEN.2012.2218594

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Author Valavanis, Alex
Dean, Paul
Lim, Yah Leng
Alhathlool, Raed
Nikolić, Milan
Kliese, Russell
Khanna, Suraj P.
Indjin, Dragan
Wilson, Stephen J.
Rakić, Aleksandar D.
Linfield, Edmund H.
Davies, Giles
Title Self-mixing interferometry with terahertz quantum cascade lasers
Journal name IEEE Sensors Journal   Check publisher's open access policy
ISSN 1530-437X
Publication date 2013-01
Sub-type Article (original research)
DOI 10.1109/JSEN.2012.2218594
Volume 13
Issue 1
Start page 37
End page 43
Total pages 7
Place of publication Piscataway, NJ, United States
Publisher Institute of Electrical and Electronics Engineers
Collection year 2014
Language eng
Formatted abstract
Terahertz frequency quantum cascade lasers (THz QCLs) are compact sources of coherent THz radiation with potential applications that include astronomy, trace-gas sensing, and security imaging. However, the reliance on slow and incoherent thermal detectors has limited their practical use in THz systems. We demonstrate THz sensing using selfmixing (SM) interferometry, in which radiation is reflected from an object back into the QCL cavity, causing changes in the laser properties; the THz QCL thus acts simultaneously as both a source and detector. Well-established SM theory predicts a much weaker coupling in THz QCLs than in diode lasers, yielding a near-linear relationship between the phase of SM signals and the external cavity length. We demonstrate velocimetry of an oscillating reflector by monitoring SM-induced changes in the QCL drive voltage. We show that this yields data equivalent to that obtained by sensing the emitted THz power, thus allowing phase-sensitive THz-SM sensing without any external detector. We also demonstrate high-resolution SM-imaging at a round-trip distance of 21 m in air—the longest-range interferometric sensing with a THz QCL to date.
Keyword Imaging
Infrared sensors
Laser feedback
Laser velocimetry
Laser velocimetry
Submillimeter wave technology
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 13 times in Scopus Article | Citations
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Created: Wed, 03 Apr 2013, 15:40:18 EST by Milan Nikolic on behalf of School of Mechanical and Mining Engineering