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