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Measurement of Spot Diameter and Divergence of Laser Beam by Shadow Method Using Generalized Parameters

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Measurement Techniques Aims and scope

The article discusses 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. The sources of error in measuring the power density distribution (PDD) in the cross section of a laser beam are presented. The main source of error is that when calculating the diameter of the PDD spot in the laser beam cross section, only a part of the power density distribution area is taken into account, and the measured power density distribution does not correspond to the normal distribution law, on which the recommendations of the standard are based. This paper proposes a method for processing the results of measurements by the shadow method of the diameter of an equivalent circle in the PDD of the laser beam cross section. The method under consideration is based on the use of generalized parameters. An experimental measuring device that can be used to control the radiation beam divergence and the diameter of the equivalent circle in the laser beam cross section in mass production of lasers is described herein. The results of processing measurements of the beam divergence of a commercial laser by the proposed method are presented. The discrepancy between the results of measurements of PDDs by the shadow method and those of the slit scanning method is calculated according to the recommendations of the current standard. A discrepancy of up to 60% can be reached depending on the shape of the measured PDD. The proposed method for processing the measurement results does not require sophisticated equipment, has high sensitivity, and is suitable for measuring the PDD of other radiation sources.

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Notes

  1. GOST 26086-84. Methods for Measuring the Beam Diameter and Energy Divergence of Laser Radiation.

  2. GOST R ISO 11146-1-2008. Lasers and Laser Installations (Systems). Methods for Measuring Widths, Divergence Angles, and Coefficients Propagation of Laser Beams. Part 1. Stigmatic (Homocentric) Weakly Astigmatic Beams.

  3. GOST R ISO/TO 11146-3-2008. Lasers and Laser Installations (Systems). Methods for Measuring Widths, Divergence Angles, and Coefficients Propagation of Laser Beams. Part 3. Inherent and Geometric Classification of Laser Beams, the Specifics of their Propagation and Measurement Techniques.

  4. GOST 24286-88. Impulse Photometry. Terms and Definitions.

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Authors and Affiliations

  1. S. I. Vavilov State Optical Institute, St. Petersburg, Russia

    M. V. Kirgetov

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  1. M. V. Kirgetov
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Correspondence to M. V. Kirgetov.

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Translated from Izmeritel’naya Tekhnika, No. 11, pp. 31–37, November, 2022.

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Kirgetov, M.V. Measurement of Spot Diameter and Divergence of Laser Beam by Shadow Method Using Generalized Parameters. Meas Tech 65, 819–826 (2023). https://doi.org/10.1007/s11018-023-02156-2

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  • DOI: https://doi.org/10.1007/s11018-023-02156-2

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