Coherent imaging and sensing using the self-mixing effect in THz quantum cascade lasers

Dean, Paul, Taimre, Thomas, Bertling, Karl, Lim, Yah Leng, Keeley, James, Valavanis, Alex, Alhathlool, Raed, Khanna, Suraj P., Lachab, Mohammad, Indjin, Dragan, Linfield, Edmund H., Davies, A. Giles and Rakić, Aleksandar (2013). Coherent imaging and sensing using the self-mixing effect in THz quantum cascade lasers. In: ITQW 2013: The 12th International Conference on Intersubband Transitions in Quantum Wells, Boston Landing, NY, USA, (1-2). 16-20 September, 2013.

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Name Description MIMEType Size Downloads
Author Dean, Paul
Taimre, Thomas
Bertling, Karl
Lim, Yah Leng
Keeley, James
Valavanis, Alex
Alhathlool, Raed
Khanna, Suraj P.
Lachab, Mohammad
Indjin, Dragan
Linfield, Edmund H.
Davies, A. Giles
Rakić, Aleksandar
Title of paper Coherent imaging and sensing using the self-mixing effect in THz quantum cascade lasers
Conference name ITQW 2013: The 12th International Conference on Intersubband Transitions in Quantum Wells
Conference location Boston Landing, NY, USA
Conference dates 16-20 September, 2013
Place of Publication Princeton, NJ, United States
Publisher Princeton University
Publication Year 2013
Sub-type Published abstract
Start page 1
End page 2
Total pages 2
Language eng
Formatted Abstract/Summary
We present recent advancements in the development of coherent THz imaging and sensing systems that exploit the self-mixing (SM) effect in quantum cascade lasers (QCLs). SM occurs when radiation from a laser is partially reflected from an external object and injected back into the laser cavity. The reflected radiation interferes („mixes‟) with the inter-cavity field, producing variations in the emitted power and terminal voltage [1]. Thus, by combining the local oscillator, mixer, and the detector all in a single laser, this technique allows the development of simple, self-aligned systems that can sense both the phase and amplitude of the THz field reflected from samples. We demonstrate the coherent nature of this sensing technique for depth-resolved reflection imaging, whereby the phaseshift induced upon reflection is interpreted in terms of surface morphology of the sample. We will also present an alternative, novel sensing modality based on this self-mixing approach.
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Tue, 03 Dec 2013, 09:20:12 EST by Karl Bertling on behalf of School of Mathematics & Physics