Calibration of transfer standard light source in the UV and VUV regions using SR from the storage ring TERAS

Abstract We have constructed a beamline which serves for calibrating transfer standard light sources in the UV and VUV regions. The synchrotron radiation (SR) from the electron storage ring TERAS (750 MeV) is used as a primary standard of spectral radiant-intensity. In the beamline, a deuterium lamp was used for transfer standard light source. The SR is linearly polarized and the deuterium lamp is almost unpolarized, and hence the polarization effect of the optical system in its beamline cannot be neglected. We evaluated the polarization effect of the optical system and calibrated the spectral radiance of a deuterium lamp in the wavelength range 160–310 nm. The uncertainty of the spectral radiance of the calibrated lamp by the polarization effects is estimated to be about ±10%.