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  4. Comparison of Interferometric and Electronic Phase Detection for TDS Systems
 
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2022
Conference Paper
Title

Comparison of Interferometric and Electronic Phase Detection for TDS Systems

Abstract
Terahertz time-domain spectroscopy requires a precise knowledge of the phase difference between two pulse trains in order to obtain high-quality terahertz spectra. In terahertz time-domain spectroscopy with systems based on repetition-rate modulation, the phase difference is commonly measured electronically utilizing a detection of the pulse trains’ higher-harmonics’ difference signal via fast photodiodes in combination with a frequency mixer. However, the electronic phase detectors used to conduct these measurements are prone to exhibit both a non-negligible timing jitter and a systematic error. Here, we present the results of our recent attempt to reduce these errors in our own electronic phase detection systems. A more than six-fold timing-jitter reduction from 59.0 fs to 8.6 fs led to a significant increase in both exploitable terahertz bandwidth and signal-to-noise ratio. Additionally, utilizing our interferometrically monitored delay line as a calibration standard, the systematic error could be removed almost entirely and thus, excellent resolution of spectral absorption lines be accomplished.
Author(s)
Paries, Felix
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Boidol, Oliver  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Freymann, Georg von  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Molter, Daniel  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Mainwork
47th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2022  
Conference
International Conference on Infrared, Millimeter and Terahertz Waves 2022  
DOI
10.1109/IRMMW-THz50927.2022.9895672
Language
English
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Keyword(s)
  • Timing jitter

  • Spectroscopy

  • Time-frequency analysis

  • Systematics

  • Phase measurement

  • Frequency measurement

  • Velocity measurement

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