Effects of multiple reflections and low-frequency interferences on measured terahertz Fourier transform spectra

Li, Shao-Liang; Zhou, Kang; Duan, Wenying; Lin, Zhen-Hui; Yao, Qijun; Shi, Sheng‐Cai

doi:10.1117/12.999900

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2013

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“…By numerically integrating the spectrum at each frequency, we found that the ratio of the third harmonic signal to the fundamental signal is about 0.01. It should be pointed out that multiple reflections of the fundamental signal in the FTS measurement system may lead to false signals appearing in the measured spectrum [14]. This effect was eliminated by tilting the metal-mesh bandpass filter by 5 • and covering the multiplier chain and detector with blackbodies.…”

Section: Resultsmentioning

confidence: 99%

Phase-locking of a terahertz solid-state source using a superconducting hot-electron bolometer mixer

Wang¹,

Zhang²,

Zhou³

et al. 2013

Supercond. Sci. Technol.

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We report on a scheme whereby the local-oscillator (LO) of a THz heterodyne receiver can be phase-locked by the mixer of the heterodyne receiver. This scheme is demonstrated for the phase-locking of an 847.6 GHz Gunn oscillator and multiplier chain combined source with a superconducting hot-electron bolometer (HEB) mixer. We show that with this technique the phase-locked beat signal can reach a signal-to-noise ratio higher than 70 dB in a resolution bandwidth (RBW) of 1 Hz. This phase-locking scheme should find good use in THz heterodyne spectrometers.

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Section: Resultsmentioning

confidence: 99%