Narrow Linewidth Tunable Terahertz Radiation By Photomixing Without Servo-Locking

Author

Rolland, Antoine ; Ducournau, Guillaume ; Danion, Gwennael ; Loas, Goulc´hen ; Brunel, Marc ; Beck, Andre ; Pavanello, Fabio ; Peytavit, Emilien ; Akalin, T. ; Zaknoune, Mohammed ; Lampin, Jean-Francois ; Bondu, Francois ; Vallet, Marc ; Szriftgiser, P. ;

Author_Institution

Opt. & Photonics Dept., Univ. de Rennes 1, Rennes, France

Volume

4

Issue

2

fYear

2014

fDate

Mar-14

Firstpage

260

Lastpage

266

Abstract

A beatnote, tunable from dc to 1 THz, provided by a dual-frequency laser is used to feed an unitravelling carrier photodiode in order to produce a highly coherent THz signal radiated by a transverse-electromagnetic-horn antenna. The THz signal is detected and analyzed by a subharmonic mixer coupled to an electrical spectrum analyzer. All components involved in this experiment operate at room temperature without phase locking the beatnote. So far, the dynamic range evolves from 58 dB at 282 GHz to 15 dB at 1.026 THz, and the measured linewidth is better than 30 kHz. Linewidth narrowing using a Brillouin fiber laser pumped by the dual-frequency laser leads to a beatnote of 500-Hz linewidth at 1 THz.

Keywords

fibre lasers; horn antennas; optical signal detection; photodiodes; semiconductor lasers; terahertz wave devices; Brillouin fiber laser; THz signal detection; beatnote; coherent THz signal; dual-frequency laser; electrical spectrum analyzer; frequency 0 THz to 1 THz; frequency 1.026 THz; frequency 282 GHz; narrow linewidth tunable terahertz radiation; photomixing; subharmonic mixer; temperature 293 K to 298 K; transverse-electromagnetic-horn antenna; unitravelling carrier photodiode; Optical polarization; Optical pumping; Phase noise; Pump lasers; Scattering; Signal to noise ratio; Dual-frequency laser; photomixing; photonic oscillator; terahertz sources;

fLanguage

English

Journal_Title

Terahertz Science and Technology, IEEE Transactions on

Publisher

ieee

ISSN

2156-342X

Type

jour

DOI

10.1109/TTHZ.2013.2296144

Filename

6704837