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Interferometry-aided delay lines for high-precision terahertz time-domain spectroscopy

: Molter, Daniel; Trierweiler, Manuel; Ellrich, Frank; Jonuscheit, Joachim; Freymann, Georg von


Institute of Electrical and Electronics Engineers -IEEE-:
41st International Conference on Infrared, Millimeter, and Terahertz waves, IRMMW-THz 2016 : 25-30 September 2016, Copenhagen, Denmark
Piscataway, NJ: IEEE, 2016
ISBN: 978-1-4673-8485-8 (Electronic)
ISBN: 978-1-4673-8486-5 (Print on Demand)
Article 7758584, 2 S.
International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) <41, 2016, Copenhagen>
Fraunhofer IPM ()
Terahertz Spectroscopy; Delays; Mach-Zehnder Interferometer; Optical Delay Lines

Terahertz time-domain spectroscopy relies on the knowledge of the time delay between two ultrashort laser pulses. This time delay is most commonly introduced by mechanically driven delay lines, where often a linear movement or in the case of oscillation based devices a sinusoidal movement is assumed or measured only imprecisely. We present a highly accurate method to measure the real time delay by overlapping the ultrashort pulse with one optical branch of a Mach-Zehnder interferometer. The interferogram provides an exact time base for the terahertz signal and enables high-precision time-domain spectroscopy even with inherently highly inaccurate delay lines.