ISO 11145:2018 pdf free
ISO 11145:2018 pdf free.Optics and photonics一Lasers and laser-related equipment一Vocabulary and symbols
This document defines basic terms, symbols, and units of measurement for the field of laser technology in order to unify the terminology and to arrive at clear definitions and reproducible tests of beam parameters and laser-oriented product properties.
NOTE The laser hierarchical vocabulary laid down in this document differs from that given in IEC 60825-1.
ISO and IEC have discussed this difference and agree that it reflects the different purposes for which the two standa rds serve. For more details, see informative Annex A.
NOTE 1 The spatial distribution of the power fenergy) density in a cross section of a laser beam does not always have circular symmetry. In this document, all terms related to these spatial distributions are split into those for beam cross sections with circular distributions and those for beam cross sections with non-circular distributions. A circular beam is characterized by its radius, w, or diameter, d. For a non-circular beam, the beam widths, dx and dy, for two orthogonal directions are given.
NOTE 2 The spatial distributions of laser beams do not have sharp edges. Therefore, the power (energy) values to which the spatial terms refer are defined. Depending on the application, different cut-off values can be chosen (for example i/e, 1/e2, 1/10 of the peak value).
NOTE 3 This document uses the subscript u to denote a percentage. For example, the percentage of the total beam power (energy) included in the value ofa given parameter. When stating quantities marked by an index “u”,”u” is replaced by the specific number.
NOTE 4 The beam width dxu (see 3.5.1) and the beam diameter du (see 3.3.1) can differ for the same value of
NOTE 5 In contrast to quantities defined by setting a cut-off value [encircled power (fenergy)], the beam widths and derived beam properties can also be defined based on the second moments of the power (energy) density distribution function (see 3.5.2). Only beam propagation ratios (see 3.10.2) that are calculated from beam widths and divergence angles derived from the second moments of the power fenergy) density distribution function allow calculation of beam propagation. In this document, quantities based on the second moment are marked by a subscript “o”.
NOTE 6 A list of symbols is given in Annex B.ISO 11145 pdf free download.
