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First absolute power measurement of a terahertz time domain spectroscopy system based on InGaAs/InAlAs photoconductors

: Globisch, B.; Dietz, R.J.B.; Steiger, A.; Bohmeyer, W.; Göbel, T.; Schell, M.


Institute of Electrical and Electronics Engineers -IEEE-:
40th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2015. Vol.2 : Hong Kong, China, 23 - 28 August 2015
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4799-8273-8
ISBN: 978-1-4799-8272-1
International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) <40, 2015, Hong Kong>
Conference Paper
Fraunhofer HHI ()

We present the first absolute power measurement of a photoconductive terahertz (THz) emitter developed for time domain spectroscopy. The broadband THz radiation is generated by a high mobility InGaAs/InAlAs multilayer heterostructure photoconductive emitter packaged into a fiber-coupled housing. For detection a recently developed ultrathin pyroelectric thin-film detector with special conductive electrodes is employed. The detector signal is traceable to the International System of Units since the power responsivity of the detector was calibrated with a standard detector at the German national metrology Institute (PTB). Absolute THz power exceeding 0.1 mW was detected.