IS 14820 : Part 1 : 2024/ISO 11146-1 : 2021 Lasers and Laser-Related Equipment - Laser Beam Widths, Divergence Angles and Beam Propagation Ratios - Methods of Test - Part 1 Stigmatic and Simple Astigmatic Beams
NATIONAL FOREWORD
This Indian Standard (Part 1) (Second Revision) which is identical to ISO 11146 – 1 : 2021 'Lasers and laser-related equipment - Test methods for laser beam widths, divergence angles and Beam propagation ratios - Part 1: Stigmatic and Simple Astigmatic Beams' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Optics and Photonics Sectional Committee and approval of the Production and General Engineering Division Council.
This standard was first published as 2000 and was subsequently revised in 2016. The first revision was based on ISO 11146-1 : 2005. This revision has been brought out to align it with the latest version of ISO 11146-1 : 2021. The major changes in this revision are as follows:
a) The terms and definitions have been harmonized with the IS/ISO 11145 : 2018;
b) The 'principal axes' have been defined more thoroughly and named as x' and y'; and
c) The requirements for the integration range for the determination of the second order moments have been relaxed.
This standard has been published in three parts. The other parts in the series are:
Part 2 General astigmatic beams
Part 3 Intrinsic and geometrical laser beam classification, propagation and details of test methods
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.