A Coherent Frequency-Domain THz Spectrometer With a Signal-to-Noise Ratio 60 DB at 1 THz

Authors

Martin O. Culjat, UCLA
Mijin Choi, New York University College of Dentistry
Rahul S. Singh, University of California
Warren S. Grundfest, University of California
Elliott R. Brown, Wright State University - Main CampusFollow
Shane N. White, University of California Los Angeles School of Dentistry

Document Type

Article

Publication Date

1-1-2008

Identifier/URL

40209032 (Pure); 44949105548 (QABO)

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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.

Repository Citation

Culjat, M. O., Choi, M., Singh, R. S., Grundfest, W. S., Brown, E. R., & White, S. N. (2008). A Coherent Frequency-Domain THz Spectrometer With a Signal-to-Noise Ratio 60 DB at 1 THz. Terahertz for Military and Security Applications VI, 6949, 694909.
https://corescholar.libraries.wright.edu/physics/1266

DOI

10.1117/12.777457