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Proceedings Paper

Continuous-wave terahertz spectrometer without active phase modulation (Conference Presentation)
Author(s): Björn Globisch; Lars Liebermeister; Simon Nellen; Robert B. Kohlhaas; Martin Schell

Paper Abstract

We present a novel system architecture for coherent cw THz spectrometers. The system features 2.5 THz bandwidth with an acquisition rate of 58 Hz and provides full phase information without active phase modulation. We achieve passive amplitude and phase modulation at a fixed intermediate frequency by using a fast sweeping laser in combination with a static optical fiber delay: By heterodyning the incoming THz signal with the frequency-shifted optical beatnote on a photomixing receiver, we can extract amplitude and phase of the signal with a lock-in detector. To the best of our knowledge, this is the fastest coherent cw THz system demonstrated so far.

Paper Details

Date Published: 10 March 2020
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Proc. SPIE 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII, 112790U (10 March 2020); doi: 10.1117/12.2545856
Show Author Affiliations
Björn Globisch, Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)
Lars Liebermeister, Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)
Simon Nellen, Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)
Robert B. Kohlhaas, Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)
Martin Schell, Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)


Published in SPIE Proceedings Vol. 11279:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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