Abstract-First absolute terahertz power measurement of a time-domain spectroscopy system

• Björn Globisch, Roman Dietz, Thorsten Göbel, Martin Schell, Werner Bohmeyer, Andreas Steiger, and Ralf Mueller 
• https://www.osapublishing.org/ol/upcoming_pdf.cfm?id=240972

Abstract: We report on the first absolute terahertz (THz) power measurement of a photoconductive emitter developed for time-domain spectroscopy (TDS). The broad-band THz radiation emitted by a photoconductor optimized for the excitation with 1550 nm femtosecond pulses was measured by an ultrathin pyroelectric thin-film (UPTF) detector. We show that this detector has a spectrally flat transmission between 100 GHz -5 THz due to special conductive electrodes on both sides of the UPTF. Its flat responsivity enables a calibration, which is traceable to the International System of Units (SI) at the THz detector calibration facility of PTB. Absolute THz power in the range from below 1 µW to above 0.1 mW was measured