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Proceedings Paper

A coherent frequency-domain THz spectrometer with a signal-to-noise ratio of 60 dB at 1 THz
Author(s): Joseph R. Demers; Ronald T. Logan Jr.; Normand J. Bergeron; Elliot R. Brown
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Paper Abstract

A terahertz frequency domain spectrometer is implemented using two ErAs:GaAs photomixers in a highly compact configuration, utilizing all solid-state components and no moving parts. Digital signal processing electronics provide precise frequency control and yield ~200 MHz accuracy of the THz signal frequency. Continuous frequency sweeping is demonstrated with better than 1 GHz resolution from 200 GHz to 1.85 THz. The coherent detection sensitivity is shown to be in good agreement with previous theoretical predictions and yields a signal-to-noise ratio of 80 dB*Hz at 200 GHz and 60 dB*Hz at 1 THz through a path length in air of one foot.

Paper Details

Date Published: 25 April 2008
PDF: 9 pages
Proc. SPIE 6949, Terahertz for Military and Security Applications VI, 694909 (25 April 2008); doi: 10.1117/12.777457
Show Author Affiliations
Joseph R. Demers, Emcore Corp. (United States)
Ronald T. Logan Jr., Emcore Corp. (United States)
Normand J. Bergeron, Bureau of Alcohol Tobacco Firearms and Explosives (United States)
Elliot R. Brown, Univ. of California, Santa Barbara (United States)

Published in SPIE Proceedings Vol. 6949:
Terahertz for Military and Security Applications VI
James O. Jensen; Hong-Liang Cui; Dwight L. Woolard; R. Jennifer Hwu, Editor(s)

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