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Proceedings Paper

Narrow linewidth tunable THz signal radiated by 1.55µm photomixing
Author(s): Antoine Rolland; Guillaume Ducournau; Goulc'hen Loas; Alexandre Beck; Fabio Pavanello; Emilien Peytavit; Tahsin Akalin; Mohamed Zaknoune; Jean-François Lampin; Marc Brunel; François Bondu; Marc Vallet; Mehdi Alouini
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Paper Abstract

THz has become a wide field of investigation opening new opportunities in a growing number of domains of physics, chemistry, and biology. Among the different techniques existing today to generate THz fields, heterodyning two optical frequencies is a useful approach when tunability is required. Moreover, to address high-resolution spectroscopy or metrology applications, a key point is the achievement of a narrow linewidth source. To this aim, two-propagation-axis dual-frequency lasers have been already shown to provide narrow linewidth tunable beat notes up to 2 THz. We report in this paper the demonstration of a narrow linewidth THz radiation source based upon this laser. Indeed the beat note provided by the laser is sent into a unitravelling carrier photodiode (UTC-PD), and radiated by a transverseelectromagnetic- horn antenna (TEM-HA). All components operate at room temperature. The emitted THz signal is detected by a subharmonic mixer coupled to an electrical spectrum analyzer. The THz signal is observed and analyzed thanks to a heterodyne detection. The measured dynamic range is 75 dB at 282 GHz, 50 dB at 500 GHz, 35 dB at 700 GHz and decreases to 20 dB at 1 THz. The decrease is due to the UTC-PD efficiency and conversion losses in the sub-harmonic mixer. The measured linewidth is better than 30 kHz at any frequency from DC to 1 THz.

Paper Details

Date Published: 15 October 2012
PDF: 7 pages
Proc. SPIE 8496, Terahertz Emitters, Receivers, and Applications III, 84960C (15 October 2012); doi: 10.1117/12.929738
Show Author Affiliations
Antoine Rolland, Institut de Physique de Rennes, CNRS, Univ. de Rennes 1 (France)
Guillaume Ducournau, IEMN, CNRS, Univ. des Sciences et Technologies de Lille (France)
Goulc'hen Loas, Institut de Physique de Rennes, CNRS, Univ. de Rennes 1 (France)
Alexandre Beck, IEMN, CNRS, Univ. des Sciences et Technologies de Lille (France)
Fabio Pavanello, IEMN, CNRS, Univ. des Sciences et Technologies de Lille (France)
Emilien Peytavit, IEMN, CNRS, Univ. des Sciences et Technologies de Lille (France)
Tahsin Akalin, IEMN, CNRS, Univ. des Sciences et Technologies de Lille (France)
Mohamed Zaknoune, IEMN, CNRS, Univ. des Sciences et Technologies de Lille (France)
Jean-François Lampin, IEMN, CNRS, Univ. des Sciences et Technologies de Lille (France)
Marc Brunel, Institut de Physique de Rennes, CNRS, Univ. de Rennes 1 (France)
François Bondu, Institut de Physique de Rennes, CNRS, Univ. de Rennes 1 (France)
Marc Vallet, Institut de Physique de Rennes, CNRS, Univ. de Rennes 1 (France)
Mehdi Alouini, Institut de Physique de Rennes, CNRS, Univ. de Rennes 1 (France)


Published in SPIE Proceedings Vol. 8496:
Terahertz Emitters, Receivers, and Applications III
Manijeh Razeghi; Alexei N. Baranov; Henry O. Everitt; John M. Zavada; Tariq Manzur, Editor(s)

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