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Open AccessArticle

Correction of Optical Delay Line Errors in Terahertz Time-Domain Spectroscopy

1
Laboratory of Information Optics, Institute of Automation and Electrometry SB RAS, 630090 Novosibirsk, Russia
2
Physics Department, Novosibirsk State University, 630090 Novosibirsk, Russia
3
Laboratory of Nonlinear Spectroscopy of Gases, Institute of Automation and Electrometry SB RAS, 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(12), 1408; https://doi.org/10.3390/electronics8121408
Received: 24 October 2019 / Revised: 18 November 2019 / Accepted: 22 November 2019 / Published: 26 November 2019
(This article belongs to the Special Issue Terahertz Technology and Its Applications)
One of the key elements of terahertz time-domain spectrometers is the optical delay line. Usually it consists of a motorized translation stage and a corner reflector mounted on its top. Errors in the positioning of the translation stage lead to various distortions of the measured waveform of terahertz pulses and, therefore, terahertz spectra. In this paper, the accuracy of position measurements is improved by using an optical encoder. Three types of systematic errors are found: Increasing and periodic offsets of the translation stage position, as well as a drift of its initial position in a series of consecutive measurements. The influence of the detected errors on the measured terahertz spectra is studied and correction methods are proposed. View Full-Text
Keywords: terahertz spectroscopy; optical delay line; correction; optical encoder; terahertz spectra; terahertz metrology terahertz spectroscopy; optical delay line; correction; optical encoder; terahertz spectra; terahertz metrology
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Mamrashev, A.; Minakov, F.; Maximov, L.; Nikolaev, N.; Chapovsky, P. Correction of Optical Delay Line Errors in Terahertz Time-Domain Spectroscopy. Electronics 2019, 8, 1408.

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