Abstract

After we replaced the argon mini-arc with a laser-driven light source in the Ultraviolet Spectral Comparator Facility at the National Institute of Standards and Technology (NIST), we realized that the optical power should be sufficient to use the comparator system for absolute-cryogenic radiometry. Calibrating working standard detectors directly against an absolute-cryogenic radiometer in the system used for calibrations would eliminate all uncertainties resulting from the use of transfer standards, which were calibrated in a separate system using a different light source and optics. The transfer standards are the middlemen we refer to in the title. Any uncertainty caused by differences in bandpass, out-off-band radiation, spectral purity, collimation, or data interpolation would be removed. In the end, we successfully set up a twin system resembling the Ultraviolet Spectral Comparator Facility and used this system to perform a primary calibration of several photodiodes, based on an absolute-cryogenic radiometer. Using this system, we were able to reduce relative standard uncertainties at wavelengths below 220 nm from above 1 % (${ k} = {1}$) to below 0.5%. We refer to this system as the Ultraviolet Scale Realization Facility or UV-SRF.

Ultraviolet radiometry with synchrotron radiation and cryogenic radiometry

Ping-Shine Shaw, Keith R. Lykke, Rajeev Gupta, Thomas R. O’Brian, Uwe Arp, Hunter H. White, Thomas B. Lucatorto, Joseph L. Dehmer, and Albert C. Parr
Appl. Opt. 38(1) 18-28 (1999)

Argon mini-arc meets its match: use of a laser-driven plasma source in ultraviolet-detector calibrations

Uwe Arp, Robert Vest, Jeanne Houston, and Thomas Lucatorto
Appl. Opt. 53(6) 1089-1093 (2014)

Synchrotron-radiation-operated cryogenic electrical-substitution radiometer as the high-accuracy primary detector standard in the ultraviolet, vacuum-ultraviolet, and soft-x-ray spectral ranges

H. Rabus, V. Persch, and G. Ulm
Appl. Opt. 36(22) 5421-5440 (1997)

Infrared spectral responsivity scale realization and validations

George P. Eppeldauer and Vyacheslav B. Podobedov
Appl. Opt. 51(25) 6003-6008 (2012)

Facility for spectral irradiance and radiance responsivity calibrations using uniform sources

Steven W. Brown, George P. Eppeldauer, and Keith R. Lykke
Appl. Opt. 45(32) 8218-8237 (2006)