Abstract-Terahertz quasi time-domain spectroscopy based on telecom technology for 1550 nm

Robert B. Kohlhaas, Arno Rehn, Simon Nellen, Martin Koch, Martin Schell, Roman J. B. Dietz, and Jan C. Balzer

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-11-12851

We present a fiber-coupled terahertz quasi time-domain spectroscopy system driven by a laser with a central wavelength of 1550 nm. By using a commercially available multimode laser diode in combination with state-of-the-art continuous wave antennas, a bandwidth of more than 1.8 THz is achieved. The peak signal-to-noise ratio is around 60 dB. A simulation based on the optical spectrum of the laser diode and the transfer function of the THz path is in agreement with the experimental results. The system is used to extract the refractive index from two different samples and the results indicate that the performance is up to 1.8 THz comparable to a terahertz time-domain spectroscopy system.

© 2017 Optical Society of America

Abstract-Fiber-coupled transceiver for terahertz reflection measurements with a 4.5 THz bandwidth

Björn Globisch, Roman J. B. Dietz, Robert B. Kohlhaas, Simon Nellen, Moritz Kleinert, Thorsten Göbel, and Martin Schell

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-41-22-5262#Abstract

We present a fiber-coupled transceiver for THz time-domain spectroscopy, which combines an emitter and a receiver on a single photoconductive chip. With a bandwidth of 4.5 THz and a peak dynamic range larger than 70 dB, it allows for THz reflection measurements under normal incidence. This THz reflection head is a promising device for applications in such fields as material inspection and nondestructive testing.

© 2016 Optical Society of America

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Abstract-All fiber-coupled THz-TDS system with kHz measurement rate based on electronically controlled optical

http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-39-22-6482
Roman J. B. Dietz, Nico Vieweg, Thomas Puppe, Armin Zach, Björn Globisch, Thorsten Göbel, Patrick Leisching, and Martin Schell  »View Author Affiliations

We demonstrate a completely fiber-coupled terahertz (THz) time-domain spectrometer (TDS) system based on electronically controlled optical sampling with two erbium-doped femtosecond fiber lasers at a central wavelength of 1560 nm. The system employs optimized InGaAs/InAlAs photoconductive antennas for THz generation and detection. With this system, we achieve measurement rates of up to 8 kHz and up to 180 ps scan range. We further achieve 2 THz spectral bandwidth and a dynamic range of 76 dB at only 500 ms measurement time.

© 2014 Optical Society of America