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A time-domain terahertz spectrometer with 90 dB dynamic range

: Vieweg, N.; Rettich, F.; Deninger, A.; Roehle, H.; Dietz, R.; Göbel, T.


Institute of Electrical and Electronics Engineers -IEEE-:
39th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2014. Proceedings. Vol.2 : September 14-19, 2014, The University of Arizona, Tucson, AZ
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-3877-3
ISBN: 978-1-4799-3878-0
International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) <39, 2014, Tucson/Ariz.>
Fraunhofer HHI ()

We present a time-domain terahertz spectrometer based on 1550 nm fiber laser technology and InGaAs photoconductive switches. The system features a voice-coil delay stage, which offers a high scanning speed of up to 60 traces per second. Owing to a precise reconstruction of the time axis, the system achieves a high dynamic range: a single pulse trace of 50 ps is acquired in only 44 ms, and transformed into a spectrum with a peak dynamic range of 60 dB. With 800 averages, the dynamic range increases to 90 dB and the measurement time still remains as short as 35 seconds.