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Continuous Wave THz System Based on an Electrically Tunable Monolithic Dual Wavelength Y-Branch DBR Diode Laser

J.O. Gwaro1, C. Brenner1, L.S. Theurer2, M. Maiwald2, B. Sumpf2, M.R. Hofmann1

Published in:

J. Infrared Milli. Terahz. Waves, vol. 41, no. 5, pp. 568-575, doi:10.1007/s10762-020-00676-4 (2020).

Abstract:

We analyse the use of a tunable dual wavelength Y-branch DBR laser diode for THz applications. The laser generates electrically tunable THz difference frequencies in the range between 100 and 300 GHz. The optical beats are tuned via current injection into a micro-resistor heater integrated on top of one of the distributed Bragg reflector (DBR) section of the diode. The laser is integrated in a homodyne THz system employing fiber coupled ion-implanted LT-GaAs log spiral antennas. The applicability of the developed system in THz spectroscopy is demonstrated by evaluating the spectral resonances of a THz filter as well as in THz metrology in thickness determination of a polyethylene sample.

1 Institute for Photonic and Terahertz Technology, Ruhr University Bochum, Universitätsstraße 150, 44780 Bochum, Germany
2 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany

Keywords:

Semiconductor laser, CW THz source, Homodyne detection.

Copyright © The Author(s) 2020.
Open Access - This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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