EN ISO 21254-3:2011

SLOVENSKI STANDARD
01-oktober-2011
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SIST EN ISO 11254-3:2006
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Lasers and laser-related equipment - Test methods for laser-induced damage threshold -
Part 3: Assurance of laser power (energy) handling capabilities (ISO 21254-3:2011)
Laser und Laseranlagen - Prüfverfahren für die laserinduzierte Zerstörschwelle - Teil 3:
Zertifizierung der Belastbarkeit hinsichtlich Laserleistung (-energie) (ISO 21254-3:2011)
Lasers et équipements associés aux lasers - Méthodes d'essai du seuil
d'endommagement provoqué par laser - Partie 3: Possibilités de traitement par
puissance (énergie) laser (ISO 21254-3:2011)
Ta slovenski standard je istoveten z: EN ISO 21254-3:2011
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 21254-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2011
ICS 31.260 Supersedes EN ISO 11254-3:2006
English Version
Lasers and laser-related equipment - Test methods for laser-
induced damage threshold - Part 3: Assurance of laser power
(energy) handling capabilities (ISO 21254-3:2011)
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 3: Zertifizierung der
Partie 3: Possibilités de traitement par puissance (énergie) Belastbarkeit hinsichtlich Laserleistung (-energie) (ISO
laser (ISO 21254-3:2011) 21254-3:2011)
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 21254-3:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 21254-3:2011) 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 11254-3:2006.
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 21254-3:2011 has been approved by CEN as a EN ISO 21254-3:2011 without any
modification.
INTERNATIONAL ISO
STANDARD 21254-3
First edition
2011-07-15
Lasers and laser-related equipment —
Test methods for laser-induced damage
threshold —
Part 3:
Assurance of laser power (energy)
handling capabilities
Lasers et équipements associés aux lasers — Méthodes d'essai du
seuil d'endommagement provoqué par laser —
Partie 3: Possibilités de traitement par puissance (énergie) laser

Reference number
ISO 21254-3:2011(E)
©
ISO 2011
ISO 21254-3:2011(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 21254-3:2011(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Symbols and units of measurement.2
5 Test methods .3
5.1 Principle.3
5.2 Test methods .3
6 Accuracy.6
7 Test report.6
Annex A (informative) Example of a test report.7
Annex B (informative) Notes on use .10
Annex C (informative) Details of the derivation of the operating-characteristic curve .14
Bibliography.16

ISO 21254-3:2011(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 21254-3 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 9,
Electro-optical systems.
This first edition of ISO 21254-3:2011 cancels and replaces ISO 11254-3:2006, which has 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 21254-3:2011(E)
Introduction
This part of ISO 21254 describes two methods of verifying the power density (energy density) handling
capability of optical components, both coated and uncoated.
The methods will give consistent measurement results and can therefore be used for acceptance testing or to
produce results which can be compared between test laboratories.
The methods are applicable to all combinations of laser wavelengths and pulse lengths. Comparison of laser
damage threshold data can, however, be misleading unless the measurements have been carried out at
identical wavelengths and pulse lengths.

INTERNATIONAL STANDARD ISO 21254-3:2011(E)

Lasers and laser-related equipment — Test methods for laser-
induced damage threshold —
Part 3:
Assurance of laser power (energy) handling capabilities
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 ISO 21254-1:2011, Annex A, for further comments.
1 Scope
This part of ISO 21254 specifies two methods of verifying the power density (energy density) handling
capability of optical surfaces.
The first method provides a rigorous test that fulfils the requirements at a specified confidence level in the
knowledge of potential defects.
The second method provides a simple, and hence inexpensive, test for an empirically derived test level.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 11145, Optics and photonics — Lasers and laser-related equipment — Vocabulary and symbols
ISO 21254-1:2011, Lasers and laser-related equipment — Test methods for laser-induced damage
threshold — Part 1: Definitions and general principles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11145 and ISO 21254-1 and the
following apply.
3.1
assurance level
φ
energy density/power density/linear power density of the laser radiation incident on the optical surface of the
component being tested
3.2
assurance area
A
φ
area over which the value of H(x,y,z) is equal to or greater than the assurance level φ
ISO 21254-3:2011(E)
3.3
confidence level
γ
probability of successful completion of the assurance test
3.4
flat-top beam
beam which has a broad area of nearly constant peak intensity (or fluence)
3.5
fraction of test area to be exposed
f
test
proportion of the total area of the optical component which has to be interrogated to achieve a certain
confidence level
3.6
area to be tested
A
test
area of the optical component which has to be interrogated to achieve a certain confidence level
3.7
horizontal overlap
Ω
x
proportion of overlapping beam area of two consecutive pulses in direction x
3.8
vertical overlap
Ω
y
proportion of overlapping beam area of two consecutive pulses in direction y
3.9
distance between test sites
d
ts
separation of test sites
4 Symbols and units of measurement
The symbols and units of measurement are compiled in Table 1. In addition, the terms and definitions given in
ISO 21254-1 apply.
Table 1 — Symbols and units of measurement
Symbol Unit Term
confidence level
γ
f fraction of test area to be exposed
test
N number of damage-initiation sites
d
2 2
assurance level
φ J/cm , W/c
...