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Optica, Optics Letters, 6(40), p. 994

DOI: 10.1364/ol.40.000994

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Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser

Journal article published in 2015 by James Keeley ORCID, Paul Dean, Alex Valavanis, Karl Bertling, Yl L. Lim ORCID, Raed Alhathlool, Thomas Taimre, Lh H. Li ORCID, Dragan Indjin, A. D. Aleksandar, Ad D. Rakić, Eh H. Linfield, Ag Giles Davies, Others
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We demonstrate coherent three-dimensional terahertz imaging by frequency modulation of a quantum cascade laser in a compact and experimentally simple self-mixing scheme. Through this approach, we can realize significantly faster acquisition rates compared to previous schemes employing longitudinal mechanical scanning of a sample. We achieve a depth resolution of better than 0.1 mu m with a power noise spectral density below -50 dB/Hz, for a sampling time of 10 ms/pixel. (C) 2015 Optical Society of America