Narrow linewidth tunable THz signal radiated by 1.55µm photomixing

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

doi:10.1117/12.929738

15 October 2012 Narrow linewidth tunable THz signal radiated by 1.55μm photomixing

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

Author Affiliations +

Proceedings Volume 8496, Terahertz Emitters, Receivers, and Applications III; 84960C (2012) https://doi.org/10.1117/12.929738
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

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.

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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, and Mehdi Alouini "Narrow linewidth tunable THz signal radiated by 1.55μm photomixing", Proc. SPIE 8496, Terahertz Emitters, Receivers, and Applications III, 84960C (15 October 2012); https://doi.org/10.1117/12.929738

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KEYWORDS

Terahertz radiation

Signal to noise ratio

Signal detection

Signal attenuation

Photodiodes

Heterodyning

Tunable lasers

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