title: Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser.
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 μm with a power noise spectral density below -50  dB/Hz, for a sampling time of 10  ms/pixel.
authors.forename: J
authors.initials: J
authors.lastname: Keeley
authors.forename: P
authors.initials: P
authors.lastname: Dean
authors.forename: A
authors.initials: A
authors.lastname: Valavanis
authors.forename: K
authors.initials: K
authors.lastname: Bertling
authors.forename: Y L
authors.initials: YL
authors.lastname: Lim
authors.forename: R
authors.initials: R
authors.lastname: Alhathlool
authors.forename: T
authors.initials: T
authors.lastname: Taimre
authors.forename: L H
authors.initials: LH
authors.lastname: Li
authors.forename: D
authors.initials: D
authors.lastname: Indjin
authors.forename: A D
authors.initials: AD
authors.lastname: Rakić
authors.forename: E H
authors.initials: EH
authors.lastname: Linfield
authors.forename: A G
authors.initials: AG
authors.lastname: Davies