Open AccessTerahertz quasi time-domain spectroscopy based on telecom technology for 1550 nm
Author(s) -
Robert B. Kohlhaas,
Arno Rehn,
Simon Nellen,
Martín Koch,
Martin Schell,
R. J. B. Dietz,
Jan C. Balzer
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.012851
Subject(s) - terahertz radiation , optics , terahertz time domain spectroscopy , terahertz spectroscopy and technology , laser , spectroscopy , materials science , time domain , photomixing , optoelectronics , refractive index , multi mode optical fiber , far infrared laser , optical fiber , physics , terahertz metamaterials , computer science , quantum mechanics , computer vision
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.