Yah Leng Lim, Karl Bertling, Thomas Taimre, Tim Gillespie, Chris Glenn, Ashley Robinson, Dragan Indjin, Yingjun Han, Lianhe Li, Edmund H. Linfield, A. Giles Davies, Paul Dean, and Aleksandar D. Rakić
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Fig. 1 (a) Schematic diagram of the experimental setup. (b) Expanded view of the QCL cold finger module. (c) Photo of the THz QCL mounted on the cold finger of the Stirling cooler.
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We report a coherent terahertz (THz) imaging system that utilises a quantum cascade laser (QCL) operating in pulsed-mode as both the source and detector. The realisation of a short-pulsed THz QCL feedback interferometer permits both high peak powers and improved thermal efficiency, which enables the cryogen-free operation of the system. In this work, we demonstrated pulsed-mode swept-frequency laser feedback interferometry experimentally. Our interferometric detection scheme not only permits the simultaneous creation of both amplitude and phase images, but inherently suppresses unwanted background radiation. We demonstrate that the proposed system utilising microsecond pulses has the potential to achieve 0.25 mega-pixel per second acquisition rates, paving the pathway to video frame rate THz imaging.
Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
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