ISO 15367-1:2003 is an international standard that describes how to measure the shape of a laser beam's wavefront. It's also used to characterize and test a variety of beam types.
ISO 15367-1:2003 specifies methods for the measurement of the topography of the wavefront of a laser beam by measurement and interpretation of the spatial distribution of the phase of that wavefront across a plane approximately perpendicular to its direction of propagation
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