Abstract

An intercomparison has been performed in the visible and near infrared between two radiometric standards: the electron storage ring BESSY and a cryogenic absolute radiometer. The spectral irradiance of the continuum source BESSY can currently be predicted with a relative systematic uncertainty of 3 × 10⁻³, whereas the radiant power of monochromatic laser radiation can be measured by the cryogenic radiometer with a relative systematic uncertainty of 10⁻⁴. In this intercomparison the responsivity S of a specially designed transfer radiometer was measured using synchrotron radiation (S^SR) and the cryogenic radiometer (S^RAD). The mean of the ratios S^RAD/S^SR for different measurement conditions was 1.0013 with a standard error of the mean of 0.0006 for a wavelength of 676 nm and 0.9990 with a standard error of 0.0007 for a wavelength of 799 nm. The systematic uncertainty of the ratio is 3.8 × 10⁻³ caused by the uncertainty of S^RAD of 1.5 × 10⁻³ and by the uncertainty of S^SR of 3.5 × 10⁻³. Both radiometric standards agree well within the combined systematic uncertainties of the two methods. The result confirms the 3 × 10⁻³ uncertainty of BESSY. This source standard has therefore a smaller uncertainty than present source standards based on high temperature blackbody radiators. The work also demonstrates how detector- and source-based radiometric standards can be intercompared or transferred between laboratories with a relative uncertainty of <3 × 10⁻³.

© 1986 Optical Society of America

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