Continuous-wave terahertz spectrometer without active phase modulation (Conference Presentation)

Björn Globisch; Lars Liebermeister; Simon Nellen; Robert B. Kohlhaas; Martin Schell

doi:10.1117/12.2545856

10 March 2020 Continuous-wave terahertz spectrometer without active phase modulation (Conference Presentation)

Björn Globisch, Lars Liebermeister, Simon Nellen, Robert B. Kohlhaas, Martin Schell

Proceedings Volume 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII; 112790U (2020) https://doi.org/10.1117/12.2545856
Event: SPIE OPTO, 2020, San Francisco, California, United States

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.

Conference Presentation

Citation Download Citation

Björn Globisch, Lars Liebermeister, Simon Nellen, Robert B. Kohlhaas, and Martin Schell "Continuous-wave terahertz spectrometer without active phase modulation (Conference Presentation)", Proc. SPIE 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII, 112790U (10 March 2020); https://doi.org/10.1117/12.2545856

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