Narrow Linewidth Tunable Terahertz Radiation By Photomixing Without Servo-Locking

作者：Rolland Antoine^*; Ducournau Guillaume; Danion Gwennal; Loas Goulc' hen; Brunel Marc; Beck Alexandre; Pavanello Fabio; Peytavit Emilien; Akalin Tashin; Zaknoune Mohammed; Lampin Jean Francois; Bondu Francois; Vallet Marc; Szriftgiser Pascal; Bacquet Denis; Alouini Mehdi

来源：IEEE Transactions on Terahertz Science and Technology, 2014, 4(2): 260-266.

DOI：10.1109/TTHZ.2013.2296144

• Dual-frequency laser
• photomixing
• photonic oscillator
• terahertz sources

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.

• 出版日期2014-3