Power measurement standards for high-power lasers: comparison between the NIST and the PTB

摘要

We report the results of the first laser high-power measurement comparison between the Physikalisch-Technische Bundesanstalt (PTB, Germany), and the National Institute of Standards and Technology (NIST, USA). Laser power transfer standards were calibrated at both national standards laboratories between 82 W and 127 W at 1.06 μm and between 85 W and 554 W at 10.6 μm. Relative agreement between the standards of the two laboratories was demonstrated to lie between 5×10~(3) and 7×10~(-3), which is well within the combined uncertainties.