EN ISO 21254-1:2011

SLOVENSKI STANDARD
01-oktober-2011
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SIST EN ISO 11254-1:2000
SIST EN ISO 11254-2:2002
SIST EN ISO 11254-2:2002/AC:2003
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Lasers and laser-related equipment - Test methods for laser-induced damage threshold -
Part 1: Definitions and general principles (ISO 21254-1:2011)
Laser und Laseranlagen - Prüfverfahren für die laserinduzierte Zerstörschwelle - Teil 1:
Begriffe und allgemeine Grundsätze (ISO 21254-1:2011)
Lasers et équipements associés aux lasers - Méthodes d'essai du seuil
d'endommagement provoqué par laser - Partie 1: Définitions et principes de base (ISO
21254-1:2011)
Ta slovenski standard je istoveten z: EN ISO 21254-1:2011
ICS:
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 21254-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2011
ICS 31.260 Supersedes EN ISO 11254-1:2000, EN ISO 11254-2:2001
English Version
Lasers and laser-related equipment - Test methods for laser-
induced damage threshold - Part 1: Definitions and general
principles (ISO 21254-1:2011)
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 21254-1:2011)
1:2011)
This European Standard was approved by CEN on 14 July 2011.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21254-1:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 21254-1:2011) 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 January 2012, and conflicting national standards shall be withdrawn at
the latest by January 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11254-1:2000, EN ISO 11254-2:2001.
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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 21254-1:2011 has been approved by CEN as a EN ISO 21254-1:2011 without any
modification.
INTERNATIONAL ISO
STANDARD 21254-1
First edition
2011-07-15
Lasers and laser-related 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 21254-1:2011(E)
©
ISO 2011
ISO 21254-1:2011(E)
©  ISO 2011
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
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Published in Switzerland
ii © ISO 2011 – All rights reserved

ISO 21254-1:2011(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Symbols and units of measurement.3
5 Sampling.4
6 Test methods .4
6.1 Principle.4
6.2 Apparatus.5
6.3 Preparation of specimens.10
6.4 Procedure.10
7 Accuracy.11
8 Test report.11
Annex A (informative) Units and scaling of laser-induced damage thresholds.13
Bibliography.14

ISO 21254-1:2011(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 21254-1 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 9,
Electro-optical systems.
This first edition of ISO 21254-1:2011, together with ISO 21254-2:2011, cancels and replaces
ISO 11254-1:2000 and ISO 11254-2:2001, which have been technically revised.
ISO 21254 consists of the following parts, under the general title Lasers and laser-related equipment — Test
methods for laser-induced damage threshold:
⎯ Part 1: Definitions and general principles
⎯ Part 2: Threshold determination
⎯ Part 3: Assurance of laser power (energy) handling capabilities
⎯ Part 4: Inspection, detection and measurement [Technical Report]

iv © ISO 2011 – All rights reserved

ISO 21254-1:2011(E)
Introduction
Optical components can be damaged by laser irradiation of sufficiently high energy or power. At any specified
laser irradiation level and operation mode of the laser source, the probability for laser damage is usually
higher for the surface of a component than for the bulk. Thus, the limiting value of an optical component is
frequently given by the damage threshold of its surface which might be coated to influence the optical
properties. Bulk damage is observed if the electrical field strength in the bulk of the component is enhanced by
self-focusing, interference, scattering or other effects. Also, imperfections, such as inclusions, dislocations,
colour centres or inhomogeneities, can reduce the power-handling capability in the bulk of an optical
component. Damage by single laser pulses is often induced by defects or mechanical stress in the coating,
contamination of the surface, or optical absorption, leading to catastrophic heating of the surface. For multiple-
pulse operation, not only reversible mechanisms induced by thermal heating and distortion but also
irreversible damage mechanisms induced by ageing, microdamage, moisture damage and generation or
migration of defects are observed. The various parts of this International Standard are concerned with the
determination of irreversible damage of the optical surfaces and the bulk of an optical component under the
influence of a laser beam. Depending on the environmental conditions, damage is a function of the material
properties and the laser parameters, in particular wavelength, spot size and irradiation duration.
This part of ISO 21254 is dedicated to the fundamentals and general principles of the measurement of laser-
induced damage thresholds (LIDTs). On the basis of the apparatus and measurement protocols described in
ISO 21254-1, ISO 21254-2 and ISO 21254-3, this part of ISO 21254 outlines procedures for damage testing
under different conditions. The protocols for the determination of the 1-on-1 and S-on-1 damage thresholds
are described in ISO 21254-2. The 1-on-1 test is a damage threshold measurement procedure that uses one
shot of laser radiation on each unexposed site on the specimen surface. In contrast to this, the S-on-1
measurement programme is based on a series of pulses with constant energy density applied to each
unexposed site of the specimen surface. This test reflects the operational conditions of the sample in typical
applications but, compared to the 1-on-1 measurement protocol, the experimental effort necessary for S-on-1
tests is significantly higher. ISO 21254-3 concentrates on the assurance of the power or energy density
handling capability of optical surfaces, leaving samples that pass the test undamaged. ISO/TR 21254-4, which
considers damage detection methods and the inspection of tested surfaces, is a Technical Report which
complements ISO 21254-1.
INTERNATIONAL STANDARD ISO 21254-1:2011(E)

Lasers and laser-related equipment — Test methods for laser-
induced damage threshold —
Part 1:
Definitions and general principles
WARNING — The extrapolation of damage data can lead to an overestimation of the laser-induced
damage threshold. In the case of toxic materials (e.g. ZnSe, GaAs, CdTe, ThF , chalcogenides, Be,
Cr, Ni), this can lead to serious health hazards. See Annex A for further comments.
1 Scope
This part of ISO 21254 defines terms used in conjunction with, and the general principles of, test methods for
determining the laser-induced damage threshold and for the assurance of optical laser components subjected
t
...