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Open AccessFeature PaperArticle

Terahertz Time-Domain Spectroscopy Based on Commercially Available 1550 nm Fabry–Perot Laser Diode and ErAs:In(Al)GaAs Photoconductors

1
Chair of Communication Systems NTS, University of Duisburg-Essen 47057 Duisburg, Germany
2
French-German Research Institute of Saint-Louis ISL, F-68301 Saint-Louis, France
3
Terahertz Devices and Systems, Department of Electrical Engineering and Information Technology, TU Darmstadt, 64283 Darmstadt, Germany
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(13), 2704; https://doi.org/10.3390/app9132704
Received: 17 June 2019 / Revised: 28 June 2019 / Accepted: 1 July 2019 / Published: 3 July 2019
(This article belongs to the Special Issue Terahertz and Far Infrared Pulsed Devices and Systems)
THz time-domain spectroscopy (TDS) is a promising tool for quality control purposes in industrial applications, but the high cost and the relatively large laser sources still make it difficult to use the full potential of the technology for a decent price. In this work, a THz TDS system, which uses a commercially available Fabry–Perot laser diode emitting at 1550 nm, is presented. By dispersion compensation, pulses with a duration of 544 fs were generated, resulting in THz radiation with a bandwidth of 1.4 THz and a peak dynamic range of 56 dB with state-of-the-art ErAs:In(Al)GaAs photoconducting antennas. These results are compared with those of a conventional and expensive fiber laser system with a 90 fs pulse duration. View Full-Text
Keywords: THz time-domain spectroscopy; mode-locked laser diode; telecom technology; photoconductors THz time-domain spectroscopy; mode-locked laser diode; telecom technology; photoconductors
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Tybussek, K.-H.; Kolpatzeck, K.; Faridi, F.; Preu, S.; Balzer, J.C. Terahertz Time-Domain Spectroscopy Based on Commercially Available 1550 nm Fabry–Perot Laser Diode and ErAs:In(Al)GaAs Photoconductors. Appl. Sci. 2019, 9, 2704.

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