Results of Comparisons of the Russian and German Standards of the Unit of Average Power of Laser Radiation at Wavelength
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INTERNATIONAL COLLABORATION RESULTS OF COMPARISONS OF THE RUSSIAN AND GERMAN STANDARDS OF THE UNIT OF AVERAGE POWER OF LASER RADIATION AT WAVELENGTHS OF 0.532, 1.064, AND 10.6 µm
A. A. Liberman, S. A. Moskalyuk, M. V. Ulanovskii, and B. B. Khlevnoi
UDC 53.089.52
Results of international bilateral supplementary comparisons of the Russian and German national standards of the unit of average laser power carried out from 2009 to 2012 are presented. Keywords: laser radiation, transfer standard, comparison, uncertainty.
Bilateral supplementary comparisons of the national standard of the unit of average laser power were carried out within the framework of international cooperation between Russia (All-Russia Research Institute of Optophysical Measurements, VNIIOFI) and Germany (Physikalisch-Technische Bundesanstalt, PTB) in the period from 2009 to 2012. The comparisons were performed by measurements of the sensitivity of a transfer standard consisting of an optical head with connector connected to a high-frequency multimeter. Successive measurements of the sensitivity of the transfer standard at wavelengths of 0.532, 1.064, and 10.6 μm at a power level of 1 W were performed. The laboratory of VNIIOFI served as the pilot laboratory. The comparisons were recorded in COOMET on March 17, 2009 under ordinal number 461/RU/09. Information about the comparisons may be found at the website of the International Bureau of Weights and Measures (BIPM) [1] under ordinal number COOMET.PR-S4. A Coherent PM10 instrument was used as the transfer standard from VNIIOFI while an Ophir 30A instrument was used as the transfer standard from PTB. A description of these transfer standards is presented in the technical protocol of the comparisons [2]. A single transfer standard from each party was provided. Form of Comparisons. The comparisons were conducted according to the following algorithm. VNIIOFI carried out a calibration of its own transfer standard and then shipped it to PTB; PTB performed its calibration and returned the standard to VNIIOFI; VNIIOFI then performed a recalibration of its transfer standard and calculated the drift of the sensitivity over the entire comparison period; PTB conducted a calibration of its transfer standard and sent it to VNIIOFI; VNIIOFI performed its calibration and returned it to PTB; PTB performed a recalibration of its transfer standard and calculated the drift of the sensitivity over the entire comparison period. Following all the measurements, the parties of the comparisons exchanged the results of laboratory measurements of the sensitivity of the laser radiation. The sensitivity was defined as the ratio of the output signal (expressed in volts) on the transfer standard to the optical power (expressed in millivolts, divided by watts) as determined by the participating laboratory. Each independent measurement consisted of a series of measurements of the output signal of the transfer standard, and a decision as to the number of measurements in a series was adopted by each laboratory independently and was
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