BS EN ISO 11146-2:2021

This standard BS EN ISO 11146-2:2021 Lasers and laser-related equipment. Test methods for laser beam widths, divergence angles and beam propagation ratios is classified in these ICS categories:

• 31.260 Optoelectronics. Laser equipment

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.