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An analysis of the errors of the measuring optical power divider of laser radiation, which is used to transmit a unit of average power of high-intensity laser radiation and is structurally made in the form of a wedge, is carried out. The error of the division ratio, which affects the accuracy of the unit transmission, is determined. The estimation of the random component of the division coefficient error is carried out and it is shown that the proposed method for its determination, based on the rearrangement of the used measuring instruments, gives the most probable estimate. The error caused by the nonlinearity of the measuring instruments that determine the division coefficient is investigated, and its largest interval is estimated. It is shown that in the case of invariability of the conversion coefficients of the used measuring instruments on the laser radiation power, the method makes it possible to exclude the dependence of the error in determining the division coefficient on the mentioned coefficients, and in another case, to reduce their influence on the transmission error. The possibility of controlling the division factor of the divider by determining the control parameter and its confidence interval when transmitting a unit of radiation power is substantiated; a formula for calculating this interval in each measurement cycle is obtained. It is shown that the value of the parameter and the change in the confidence interval can be used to control the reliability of the transmission of the unit of power to the calibrated measuring instrument in real time.

A method is proposed for transferring the unit of mean power of laser radiation by means of measuring high-intensity power (kilowatts), with the possibility of constant monitoring of the transfer process. A measuring optical power divider for laser radiation has been developed, structurally built in the form of a wedge and permitting, according to the relatively small power of the radiation reflected from the lighted surface of the forward face of the wedge, to determine the radiant power of the beam incident upon the measuring instrument to be calibrated. The proposed method is based on applying the developed divisor in the reference installation and provides for the implementation of three modes of operation of the installation: the mode for determination of the coefficient of equivalence; the mode for determination of the division ratio of the optical splitter; the mode of transfer of the power unit by measurement facilities; and determination of the control parameter of the optical splitter. The transfer process is monitored by measuring the radiant power reflected from the back edge of the wedge, and determining the control parameter. The conditions in which it is advisable to use the proposed mode of determining the division ratio of the optical splitter are given. A special feature of the method under study is the possibility of timely monitoring of the division ratio of the optical splitter, making it possible to estimate in real time the reliability of the process of calibration of measurement instruments. A formula was derived for the metrological traceability of the power measurement results to GET 28-2016. The basic error component errors of the determination of the radiant power arriving at input of the measurement facilities being calibrated are considered. The results of the experimental studies of this method make it possible to confirm that at 10.6 μm wavelength, the total measurement error of the power, expressed as the SD, does not exceed 2.0%. The method can be used in the corresponding secondary standards of the power unit that obtain a unit from the State Special Standard for Mean Power, GET 28-2016.