SIST EN ISO 21254-1:2025

SLOVENSKI STANDARD
01-november-2025
Nadomešča:
SIST EN ISO 21254-1:2011
Laserji in z laserji povezana oprema - Preskusne metode za ugotavljanje praga
poškodbe, povzročene z laserjem - 1. del: Definicije in splošna načela (ISO 21254-
1:2025)
Lasers and laser-related equipment - Test methods for laser-induced damage threshold -
Part 1: Definitions and general principles (ISO 21254-1:2025)
Laser und Laseranlagen - Prüfverfahren für die laserinduzierte Zerstörschwelle - Teil 1:
Begriffe und allgemeine Grundsätze (ISO 21254-1:2025)
Lasers et équipements associés aux lasers - Méthodes d'essai du seuil
d'endommagement provoqué par laser - Partie 1: Définitions et principes de base (ISO
21254-1:2025)
Ta slovenski standard je istoveten z: EN ISO 21254-1:2025
ICS:
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21254-1
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2025
EUROPÄISCHE NORM
ICS 31.260 Supersedes EN ISO 21254-1:2011
English Version
Lasers and laser-related equipment - Test methods for
laser-induced damage threshold - Part 1: Definitions and
general principles (ISO 21254-1:2025)
Lasers et équipements associés aux lasers - Méthodes Laser und Laseranlagen - Prüfverfahren für die
d'essai du seuil d'endommagement provoqué par laser laserinduzierte Zerstörschwelle - Teil 1: Begriffe und
- Partie 1: Définitions et principes de base (ISO 21254- allgemeine Grundsätze (ISO 21254-1:2025)
1:2025)
This European Standard was approved by CEN on 27 July 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21254-1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21254-1:2025) has been prepared by Technical Committee ISO/TC 172 "Optics
and photonics" in collaboration with Technical Committee CEN/TC 123 “Lasers and photonics” the
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2026, and conflicting national standards shall
be withdrawn at the latest by March 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 21254-1:2011.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 21254-1:2025 has been approved by CEN as EN ISO 21254-1:2025 without any
modification.
International
Standard
ISO 21254-1
Second edition
Lasers and laser-related
2025-08
equipment — Test methods for
laser-induced damage threshold —
Part 1:
Definitions and general principles
Lasers et équipements associés aux lasers — Méthodes d'essai du
seuil d'endommagement provoqué par laser —
Partie 1: Définitions et principes de base
Reference number
ISO 21254-1:2025(en) © ISO 2025

ISO 21254-1:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
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Published in Switzerland
ii
ISO 21254-1:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Terms and definitions .2
3.2 Symbols and units of measurement.3
4 Units of laser irradiation, LIDT and pertinent units . 4
5 Laser damage, damage threshold and associated criteria . 4
5.1 General laser damage criteria .4
5.1.1 General .4
5.1.2 Classical criterion of laser-induced damage .5
5.1.3 Functional criterion of laser-induced damage .5
5.1.4 Failure mode.5
5.1.5 Laser-induced damage threshold (LIDT) .5
5.1.6 Functional laser-induced damage threshold (F-LIDT) .5
5.1.7 Method of damage threshold calculation .5
5.2 Techniques of laser damage interrogation and related terms .5
5.2.1 General .5
5.2.2 Classical 1-on-1 test .6
5.2.3 Classical S-on-1 test .6
5.2.4 Functional R(S)-on-1 test .6
5.2.5 Functional raster scan test.6
5.2.6 Acceptance test “pass-fail” .6
5.2.7 Laser-induced fatigue .6
5.2.8 Characteristic damage curve or fatigue curve .6
5.2.9 Laser-induced conditioning .6
5.2.10 Conditioning curve .7
5.3 Parameters of testing, sampling and reporting .7
5.3.1 Typical pulse .7
5.3.2 Laser irradiation level, L .7
5.3.3 Maximum irradiation dose .7
5.3.4 Applied irradiation dose .7
5.3.5 Target plane .7
6 Sampling . 7
7 Test methods . 8
7.1 Principle .8
7.2 Apparatus .9
7.2.1 Laser .9
7.2.2 Variable attenuator and beam delivery system .9
7.2.3 Focusing system.9
7.2.4 Specimen holder .10
7.2.5 Damage detection and inspection systems .
...