title: Absolute terahertz power measurement of a time-domain spectroscopy system.
abstract: We report on, to the best of our knowledge, the first absolute terahertz (THz) power measurement of a photoconductive emitter developed for time-domain spectroscopy (TDS). The broadband 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 and 5 THz due to special conductive electrodes on both sides of the UPTF. Its flat responsivity allows the calibration with a standard detector that 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.
authors.forename: Björn
authors.initials: B
authors.lastname: Globisch
authors.forename: Roman J B
authors.initials: RJ
authors.lastname: Dietz
authors.forename: Thorsten
authors.initials: T
authors.lastname: Göbel
authors.forename: Martin
authors.initials: M
authors.lastname: Schell
authors.forename: Werner
authors.initials: W
authors.lastname: Bohmeyer
authors.forename: Ralf
authors.initials: R
authors.lastname: Müller
authors.forename: Andreas
authors.initials: A
authors.lastname: Steiger