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Measurement of spot diameter and divergence of laser beam by shadow method using generalized parameters
https://doi.org/10.32446/0368-1025it.2022-11-31-37
Abstract
The methods of measuring the divergence of a beam and the diameter of an equivalent circle in the cross section of a laser beam regulated by current standards are considered. The sources of error in measuring the power density distribution in the cross section of the laser beam are shown. The main source of error lies in taking into account only part of the distribution area in the calculation and the non-compliance of the measured distribution with the normal distribution law on which the recommendations of the standard are based. A method is proposed for calculating the diameter of an equivalent circle in the distribution of power density in the cross section of a laser beam, based on the results of shadow measurement. The method under consideration is based on the application of generalized parameters. An experimental measuring device is described that can be used to control the divergence and diameter of an equivalent circle in the cross section of laser beams in the mass production of lasers. The results of measuring the divergence of the radiation beam of a serial laser obtained by the proposed method are presented. The discrepancy between the measurement results by the shadow method and the slit scanning method according to the recommendation of the existing standard is calculated. The discrepancy reaches 60% depending on the shape of the measured distribution. The proposed method does not require complex equipment, has high sensitivity and is suitable for measuring other radiation sources.
About the Author
M. V. Kirgetov
S. I. Vavilov State Optical Institute
Russian Federation
Russian Federation
Mikhail V. Kirgetov
St. Petersburg
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Review
For citations:
Kirgetov M.V. Measurement of spot diameter and divergence of laser beam by shadow method using generalized parameters. Izmeritel`naya Tekhnika. 2022;(11):31-37. (In Russ.) https://doi.org/10.32446/0368-1025it.2022-11-31-37
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