Abstract
This describes a simple method to find two important characteristic parameters of a beam with a Gaussian irradiance profile—the position of the plane of the beam waist and the value of ω0 in that plane. It is necessary to observe the positions of maximum or minimum irradiances along the beam axis in the field diffracted by a circular aperture. These positions occur at places where the direct geometric-optical wave is in phase or out of phase with the boundary-diffraction wave.
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