Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Poster Session: Matter at Low Temperature
TT 11.7: Poster
Montag, 14. März 2011, 14:00–18:00, P4
Coherent broadband continuous-wave THz spectrometry at low temperatures — Jennifer Marx1, •Ernesto Uldarico Vidal1, Komalavalli Thirunavukkuarasu1, Holger Schmitz1, Axel Roggenbuck2, Anselm Deninger2, Iván Cámara Mayorga3, Rolf Güsten3, Joachim Hemberger1, and Markus Grüninger1 — 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany — 2TOPTICA Photonics AG, Lochhamer Schlag 19, D-82166 Gräfelfing, Germany — 3Max-Planck-Institute for Radio Astronomy, Auf dem Hügel 69, D-53121 Bonn, Germany
We report on the implementation of a cryostat into a continuous-wave THz spectrometer which uses the principle of mixing the light of two NIR DFB diode lasers at a photomixer for generating THz radiation over a broad range from 60 GHz to 1.3 THz. The THz radiation is detected coherently by a second photomixer. In combination with a fiber stretcher, our compact fiber-based setup allows very reliable determination of both real and imaginary parts of the complex optical functions, eliminating the need for Kramers-Kronig transformation. Furthermore, photocurrent correction can be used to correct for instabilities such as thermal drifts. Here, we present some results on different solid-state samples as an illustration of the capability of the spectrometer in the temperature range from room temperature to 1.5 K.