Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 18: Laser and Laser Applications
Q 18.4: Talk
Tuesday, March 15, 2022, 11:15–11:30, Q-H15
Integration of a DSTMS based THz emitter into a fibre-coupled THz time-domain spectroscopy system. — •Tina Heßelmann1,2, Konstantin Wenzel11, Robert Kohlhaas1, Martin Schell1,3, Björn Globisch1,3, and Lars Liebermeister1 — 1Fraunhofer Heinrich Hertz Institute, Einsteinufer 37, 10587 Berlin, Germany — 2Berliner Hochschule für Technik, Luxemburger Str. 10, 13353 Berlin, Germany — 3Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstraße 36, 10623 Berlin, Germany
In recent years, Terahertz (THz) time-domain spectroscopy (TDS) has gained relevance in science and is now established on the market. THz spectroscopy is particularly used in contactless and non-destructive thickness measurement of coatings. Due to their user-friendly operation, fibre-coupled THz spectrometer are commonly utilized for such applications. By combining a fs-pulse fibre laser with state-of-the-art semiconductor-based photoconductive antennas, these systems reach bandwidths up to 6.5 THz. However, a recently developed detector, based on a photoconductive membrane, accomplishes an effective bandwidth of 10 THz. A fibre coupled emitter with comparable bandwidth is still needed. An alternate approach uses non-linear optical rectification, e.g. based on DSTMS-crystals in free space excitation, which allows for a wider bandwidth. This study integrates a DSTMS crystal as a emitter into a fibre-coupled TDS system while applying the novel photoconductive antenna as receiver. We find that this setup can utilize the bandwidth of the new receiver by demonstrating a THz bandwidth up to 9.5 THz in a fibre-coupled THz TDS-system.