Stable continuous-wave THz vector imaging based on an optical frequency comb

Zuomin Yang; Zijie Lu; Shiwei Wang; Hongqi Zhang; Lu Zhang; Xianbin Yu

doi:10.1117/12.2604690

1 November 2021 Stable continuous-wave THz vector imaging based on an optical frequency comb

Zuomin Yang, Zijie Lu, Shiwei Wang, Hongqi Zhang, Lu Zhang, Xianbin Yu

Proceedings Volume 12057, Twelfth International Conference on Information Optics and Photonics; 1205718 (2021) https://doi.org/10.1117/12.2604690
Event: Twelfth International Conference on Information Optics and Photonics, 2021, Xi'an, China

Abstract

We propose and experimentally demonstrate a continuous-wave terahertz (THz) vector imaging system based on an optical frequency comb, which can avoid interference of phase noise induced by both laser and RF sources. As a benefit, the proposed THz system is capable of extracting stable amplitude and phase information and supporting robust THz imaging measurements. The system uses a phase modulator to create a wide optical frequency comb, and an intensity modulator to generate first-order harmonics of each comb line. The THz signal is photonically generated by an uni-traveling carrier photodiode (UTC-PD), and then detected in a Schottky barrier diode (SBD) detector. With respects to the reception, the THz signal is firstly down-converted into an electrical signal at the SBD based on the square-law detection and self-mixing, which is then mixed with a local oscillator (LO) and fed into a lock-in amplifier (LIA) to extract amplitude and phase information for imaging. The experimental results show the fluctuations of amplitude and phase in this system are about 0.14 mV and 3.3°, respectively. The system has a great potential in real-time THz security inspection and biomedical science.

Citation Download Citation

Zuomin Yang, Zijie Lu, Shiwei Wang, Hongqi Zhang, Lu Zhang, and Xianbin Yu "Stable continuous-wave THz vector imaging based on an optical frequency comb", Proc. SPIE 12057, Twelfth International Conference on Information Optics and Photonics, 1205718 (1 November 2021); https://doi.org/10.1117/12.2604690

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KEYWORDS

Terahertz radiation

Frequency combs

Imaging systems

Continuous wave operation

Optical amplifiers

Signal detection

Modulators

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