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Article:Dean, P, Valavanis, A, Keeley, J et al. (11 more authors) (2013) Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser.

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

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