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TT: Tiefe Temperaturen

TT 13: Messger
äte, Kryotechnik

TT 13.10: Vortrag

Dienstag, 9. März 2004, 18:30–18:45, H20

Measurements of coherent transition radiation by Hilbert-transform spectroscopy with Josephson junctions — •Andre Kaestner¹, Frank Ludwig², Frank Ludwig¹, and Meinhard Schilling¹ — ¹Institut für elektrische Messtechnik und Grundlagen der Elektrotechnik, TU Braunschweig, Hans-Sommer-Straße 66, D-38106 Braunschweig — ²Deutsches-Elektronen-Synchrotron DESY, Notkestraße 85, D-22603 Hamburg

We present measurements of coherent transition radiation from 50 to 500 GHz using the method of Hilbert-transform spectroscopy. The Josephson junctions out of YBa₂Cu₃O₇ (YBCO) used for Hilbert-transform spectroscopy are prepared on symmetric 24^o LaAlO₃ bicrystal substrates. For better coupling of high frequency radiation they are equiped with integrated wideband antennas out of YBCO. We obtain for a 6 micrometer wide junction an I_CR_N-product of 170 microvolt at 77 K and 2.0 millivolt at 10 K. The set-up is optimized for low insertion loss over a wide frequency range from 50 GHz to 2 THz. The measurements of coherent transition radiation are compared with similar measurements done at the Tesla Test Facility for the same set-up.