A Method of Transferring the Unit of Power of High-Intensity Laser Radiation
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OPTOPHYSICAL MEASUREMENTS A METHOD OF TRANSFERRING THE UNIT OF POWER OF HIGH-INTENSITY LASER RADIATION A. I. Kolpakov,1 A. M Raitsin,2 and M. V. Ulanovskii1
UDC 681.7.08
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. Keywords: metrology, methods for measurement of parameters of high-intensity lasers, calibration of measurement instruments, transfer of power unit, secondary standard, measurement optical power divider.
One of the promising applications of high-intensity radiation of continuous process lasers is the industrial handling of materials [1]. CO2 lasers, the effectiveness of which results from their high characteristic coefficient (~15–20%), are widely used to perform this. With insignificant heat losses of laser radiation, it is possible to perform cutting, including non-metallic materials of greater thicknesses. The effectiveness of laser action depends directly on careful monitoring of the energy and spatial-energy parameters of
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