Narrow Linewidth Tunable Terahertz Radiation By Photomixing Without Servo-Locking
Terahertz Science and Technology, IEEE Transactions （2014）
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.
MoreTranslated text
Key words
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,photonic oscillator,terahertz sources,optical pumping,signal to noise ratio,scattering,phase noise
AI Read Science
Must-Reading Tree
Example
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined