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The National Institute of Standards and Technology supplies
calibrated photodiode standards and special tests of photodetectors
for absolute spectral responsivity from 200 nm to 1800 nm. (This
service will soon be expanded to 20 m in the infrared.) The scale
of absolute spectral responsivity is based solely on detector
measurements traceable to the High Accuracy Cryogenic Radiometer
maintained by the National Institute of Standards and Technology.
Silicon photodiode light-trapping detectors are used to transfer
the optical power unit from this cryogenic radiometer to
monochromator-based facilities where routine measurements are
performed. The transfer also involves modeling the quantum
efficiency of the silicon photodiode light-trapping detectors. A
description of current measurement services is given along with the
procedures, equipment, and techniques used to perform these
calibrations. Detailed estimates and procedures for determining
uncertainties of the reported values are also presented."
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