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Calibration of free-space and fiber-coupled single-photon detectors
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We measure the detection efficiency of single-photon detectors at wavelengths near 851 nm and 1533.6 nm. We investigate the spatial uniformity of one free-space-coupled single-photon avalanche diode and present a comparison between fusion-spliced and connectorized fiber-coupled single-photon detectors. We find that our expanded relative uncertainty for a single measurement of the detection efficiency is as low as 0.70 % for fiber-coupled measurements at 1533.6 nm and as high as 1.78 % for our free-space characterization at 851.7 nm. The detection-efficiency determination includes corrections for afterpulsing, dark count, and count-rate effects of the single-photon detector with the detection efficiency interpolated to operation at a specified detected count rate.
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Meta-study of laser power calibrations ranging 20 orders of magnitude with traceability to the kilogram
NIST's laser power meters spanning 20 orders of magnitude agree internally, and the paper maps all of them to a radiation-pressure, kilogram-traceable path with less than 3% expanded uncertainty.
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