Hilbert-transform spectroscopy with high-T-c Josephson junctions: First spectrometers and first applications

First laboratory prototypes of Hilbert-transform spectrometers have been de veloped To meet the requirements of Hilbert-transform spectroscopy, high-T- c Josephson junctions with RSJ-like behavior have been fabricated on twin-f ree NdGaO3 bicrystal substrates. The operation of the spectrometers has bee n demonstrated from 60 GHz up to 2.25 THz The first out-of-lab application of Hilbert-transform spectrometers has been successfully demonstrated at th e TESLA Test Facility linear accelerator at DESY (Hamburg). The spectra of coherent transition electromagnetic radiation from electron bunches have be en measured and a bunch length of sigma(t) = 1.2 ps has been derived from t hese spectra. The market perspectives of Hilbert spectrometers have been es timated.