title: Establishing a high-accuracy spectral response scale in the near infrared with digital filters.
abstract: Spectrally invariant detectors are commonly used to interpolate or extrapolate the responsivity of InGaAs detectors in the infrared from absolute calibrations at a few wavelengths. The random noise in such detectors limits the accuracy that can be achieved in a narrowband, double-monochromator setup. We propose the application of a dedicated digital filter, which reduces the uncertainty by 30%, and combine it by calibrating a group of three detectors. The uncertainties are propagated from the observed variance in the relative measurement to the combined uncertainty of 0.4% (2sigma) in the responsivity values of the InGaAs detectors in the range of 1010-1640 nm.
authors.affiliation: Norwegian Metrology Service (JV), Fetveien 99, Kjeller N-2007, Norway. jarle.gran@justervesent.no
authors.forename: Jarle
authors.initials: J
authors.lastname: Gran
authors.forename: Kristian
authors.initials: K
authors.lastname: Ellingsberg
authors.forename: Aasmund S
authors.initials: AS
authors.lastname: Sudbø