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

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

J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies  »View Author Affiliations

http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-40-6-994

Optics Letters, Vol. 40, Issue 6, pp. 994-997 (2015)
http://dx.doi.org/10.1364/OL.40.000994

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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 μm with a power noise spectral density below −50  dB/Hz, for a sampling time of 10  ms/pixel.

© 2015 Optical Society of America