25 April 2008 A coherent frequency-domain THz spectrometer with a signal-to-noise ratio of 60 dB at 1 THz
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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.
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Joseph R. Demers, Ronald T. Logan, Normand J. Bergeron, Elliot R. Brown, "A coherent frequency-domain THz spectrometer with a signal-to-noise ratio of 60 dB at 1 THz", Proc. SPIE 6949, Terahertz for Military and Security Applications VI, 694909 (25 April 2008); doi: 10.1117/12.777457; https://doi.org/10.1117/12.777457
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