CSN EN ISO 11146-2

CSN EN ISO 11146-2 This document specifies methods for measuring beam widths (diameter), divergence angles and beam propagation ratios of laser beams. This document is applicable to general astigmatic beams or unknown types of beams. For stigmatic and simple astigmatic beams, ISO 11146 1 is applicable. Within this document, the description of laser beams is accomplished by means of the second order moments of the Wigner distribution rather than physical quantities such as beam widths and divergence angles. However, these physical quantities are closely related to the second order moments of the Wigner distribution. In ISO/TR 11146 3, formulae are given to calculate all relevant physical quantities from the measured second order moments.
Original English text of CSN EN Standard.
The price of the Standard included all amendments and correcturs.