SIST EN ISO 21254-3:2011

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)

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.

Laser und Laseranlagen - Prüfverfahren für die laserinduzierte Zerstörschwelle - Teil 3: Zertifizierung der Belastbarkeit hinsichtlich Laserleistung (-energie) (ISO 21254-3:2011)

Diese Norm ist ein Teil von ISO 21254 und legt einen Arbeitsablauf fest, für den zwei Prüfverfahren zur Zertifizierung der Belastbarkeit hinsichtlich Leistungsdichte (Energiedichte) von sowohl beschichteten als auch unbeschichteten optischen Oberflächen angeboten werden.
Das erste Verfahren liefert eine strenge Prüfung, die die Anforderungen an ein festgelegtes Vertrauensintervall in Kenntnis potenzieller Defekte erfüllt.
Das zweite Verfahren bietet eine einfache Prüfung für ein empirisch abgeleitetes Prüfniveau und erlaubt eine kostengünstige Prüfung.

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)

L'ISO 21254-3:2011 spécifie un mode opératoire en présentant deux méthodes d'essai permettant de vérifier la capacité des surfaces optiques à supporter la densité de puissance (densité d'énergie).
La première méthode est un essai rigoureux satisfaisant aux exigences à un niveau de confiance spécifié en matière de connaissance des défauts potentiels.
La seconde méthode est un essai simplifié pour un niveau d'essai dérivé de façon empirique, donc peu coûteux.

Laserji in laserska oprema - Določanje praga poškodbe na optični površini, povzročene z laserjem - 3. del: Zagotavljanje zmožnosti ravnanja z lasersko energijo (ISO 21254-3:2011)

Ta del ISO 21254 določa dve metodi preverjanja zmožnosti ravnanja z gostoto moči (gostoto energije) na optičnih površinah. Prva metoda zagotavlja strog preskus, ki izpolni zahteve pri določeni stopnji zaupanja in znanja o potencialnih okvarah. Druga metoda zagotavlja preprost in zato poceni preskus za empirično izpeljano stopnjo preskusa.

General Information

• Status: Published
• Public Enquiry End Date: 04-Apr-2009
• Publication Date: 15-Sep-2011
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: VAZ - Healthcare
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-Jul-2011
• Due Date: 03-Oct-2011
• Completion Date: 16-Sep-2011
• Ref Project: EN ISO 21254-3:2011 - 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)

Relations

• Replaces: SIST EN ISO 11254-3:2006 - Lasers and laser-related equipment - Determination of laser-induced damage threshold of optical surfaces - Part 3: Assurance of laser power (energy) handling capabilities (ISO 11254-3:2006)
• Effective Date: 01-Oct-2011
• Replaces: SIST EN ISO 11254-3:2006 - Lasers and laser-related equipment - Determination of laser-induced damage threshold of optical surfaces - Part 3: Assurance of laser power (energy) handling capabilities (ISO 11254-3:2006)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 21254-3:2011
01-oktober-2011
1DGRPHãþD
SIST EN ISO 11254-3:2006
/DVHUMLLQODVHUVNDRSUHPD'RORþDQMHSUDJDSRãNRGEHQDRSWLþQLSRYUãLQL
SRY]URþHQH]ODVHUMHPGHO=DJRWDYOMDQMH]PRåQRVWLUDYQDQMD]ODVHUVNR
HQHUJLMR,62
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
SIST EN ISO 21254-3:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 21254-3:2011

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SIST EN ISO 21254-3:2011


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.

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SIST EN ISO 21254-3:2011
EN ISO 21254-3:2011 (E)
Contents Page
Foreword .3

2

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SIST EN ISO 21254-3:2011
EN ISO 21254-3:2011 (E)
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.

3

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SIST EN ISO 21254-3:2011

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SIST EN ISO 21254-3:2011

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

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SIST EN ISO 21254-3:2011
ISO 21254-3:2011(E)

COPYRIGHT PROTECTED DOCUMENT


©  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 [e-mail]
Web www.iso.org
Published in Switzerland

ii © ISO 2011 – All rights reserved

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SIST EN ISO 21254-3:2011
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 2011 – All rights reserved iii

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SIST EN ISO 21254-3:2011
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

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SIST EN ISO 21254-3:2011
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.

© ISO 2011 – All rights reserved v

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SIST EN ISO 21254-3:2011

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SIST EN ISO 21254-3:2011
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,
4
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 2011 – All rights reserved 1

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SIST EN ISO 21254-3:2011
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/cm , W/cm
2
A cm assurance area
φ
2
A cm area to be tested
test
Ω horizontal overlap
x
Ω vertical overlap
y
d distance between test sites
ts
2 © ISO 2011 – All rights reserved

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SIST EN ISO 21254-3:2011
ISO 21254-3:2011(E)
5 Test methods
5.1 Principle
This part of ISO 21254 provides methods that will give a high level of confidence in the power density (energy
density) handling capability of the component tested.
The methods can be used in a wide variety of applications, including: non-destructive testing, witness
sampling, lot sampling and sub-aperture inspection. The level of confidence that the component does not
contain a defect with a lower damage threshold than the acceptable irradiation strength increases with the
percentage fraction of the area tested. These confidence levels are discussed in Annexes B and C.
Discussions shall be held between the test house and the user/component manufacturer to define the
confidence level required and the number of shots per site (1-on-1 or S-on-1 testing) and the pulse-repetition
frequency at which the tests are to be carried out.
This will define parameters such as the assurance area, A , the distance between test sites, d , and the total
φ ts
number of sites, N , to be irradiated.
ts
The apparatus for, general principles of and sampling for laser-induced damage testing are described in
ISO 21254-1. A laser system with a suitable beam preparation system delivering laser radiation with a
reproducible flat-top spatial profile is required for the assurance of laser power (energy) handling capabilities.
In this test, sampled test sites on the specimen surface are irradiated at an agreed or specified irradiation
strength, irradiating in sequence a fraction of the specimen area and verifying that no damage is observed.
Enough test sites on the optical surface under test shall be irradiated so that a given confidence level can be
established.
Since the observation of any damage during a test constitutes a failure, this test can be non-destructive for
parts for which this is considered acceptable.
The microscopic examination of the test site before and after irradiation is used to detect any damage.
The fluence-handling capability of an optical surface under irradiation by short pulsed lasers is usually
expressed in units of energy density, i.e. joules per square centimetre.
The power-handling capability of an optical surface under irradiation by cw (continuous-wave) lasers or
quasi-cw lasers is usually expressed in units of linear power density, i.e. watts per centimetre. The proper
physical parameter and units for scaling results obtained with quasi-cw and cw-lasers is the linear power
density, expressed in watts per centimetre.
5.2 Test methods
5.2.1 General
In tests that sample the ability
...

SLOVENSKI STANDARD
oSIST prEN ISO 21254-3:2009
01-marec-2009
/DVHUMLLQODVHUVNDRSUHPD'RORþDQMHSUDJDSRãNRGEHQDRSWLþQLSRYUãLQL
SRY]URþHQH]ODVHUMHPGHO=DJRWDYOMDQMH]PRåQRVWLUDYQDQMD]ODVHUVNR
HQHUJLMR,62',6
Lasers and laser-related equipment - Test methods for laser radiation-induced damage
threshold - Part 3: Assurance of laser power (energy) handling capabilities (ISO/DIS
21254-3:2008)
Laser und Laseranlagen - Prüfverfahren für die laserstrahlungsinduzierte
Zerstörschwelle - Teil 3: Zertifizierung der Belastbarkeit hinsichtlich Laserleistung (-
energie) (ISO/DIS 21254-3:2008)
Lasers et équipements associés aux lasers - Méthodes d'essai pour seuil
d'endommagement provoqué par laser - Partie 3: Possibilités de traitement par
puissance (énergie) laser (ISO/DIS 21254-3:2008)
Ta slovenski standard je istoveten z: prEN ISO 21254-3
ICS:
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
oSIST prEN ISO 21254-3:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 21254-3:2009

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oSIST prEN ISO 21254-3:2009
EUROPEAN STANDARD
DRAFT
prEN ISO 21254-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2008
ICS 31.260 Will supersede EN ISO 11254-3:2006
English Version
Lasers and laser-related equipment - Test methods for laser
radiation-induced damage threshold - Part 3: Assurance of laser
power (energy) handling capabilities (ISO/DIS 21254-3:2008)
Lasers et équipements associés aux lasers - Méthodes Laser und Laseranlagen - Prüfverfahren für die
d'essai pour seuil d'endommagement provoqué par laser - laserstrahlungsinduzierte Zerstörschwelle - Teil 3:
Partie 3: Possibilités de traitement par puissance (énergie) Zertifizierung der Belastbarkeit hinsichtlich Laserleistung (-
laser (ISO/DIS 21254-3:2008) energie) (ISO/DIS 21254-3:2008)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 123.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 21254-3:2008: E
worldwide for CEN national Members.

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oSIST prEN ISO 21254-3:2009
prEN ISO 21254-3:2008 (E)
Contents Page
Foreword .3

2

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oSIST prEN ISO 21254-3:2009
prEN ISO 21254-3:2008 (E)
Foreword
This document (prEN ISO 21254-3:2008) has been prepared by Technical Committee ISO/TC 172 "Optics
and optical instruments" in collaboration with Technical Committee CEN/TC 123 “Lasers and photonics”, the
secretariat of which is held by DIN.
This document is currently submitted to the parallel Enquiry.
This document will supersede EN ISO 11254-3:2006.
Endorsement notice
The text of ISO/DIS 21254-3:2008 has been approved by CEN as a prEN ISO 21254-3:2008 without any
modification.

3

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oSIST prEN ISO 21254-3:2009

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oSIST prEN ISO 21254-3:2009
DRAFT INTERNATIONAL STANDARD ISO/DIS 21254-3
ISO/TC 172/SC 9 Secretariat: DIN
Voting begins on: Voting terminates on:
2008-10-16 2009-03-16
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Lasers and laser-related equipment — Test methods for laser
radiation-induced damage threshold —
Part 3:
Assurance of laser power (energy) handling capabilities
Lasers et équipements associés aux lasers — Méthodes d'essai pour seuil d'endommagement provoqué par
laser —
Partie 3: Possibilités de traitement par puissance (énergie) laser
(Revision of ISO 11254-3:2006)
ICS 31.260

ISO/CEN PARALLEL ENQUIRY
The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a subject
of interest to European standardization. In accordance with the ISO-lead mode of collaboration as
defined in the Vienna Agreement, consultation on this ISO/DIS has the same effect for CEN
members as would a CEN enquiry on a draft European Standard. Should this draft be accepted, a
final draft, established on the basis of comments received, will be submitted to a parallel two-month FDIS
vote in ISO and formal vote in CEN.
In accordance with the provisions of Council Resolution 15/1993 this document is circulated in
the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué
en version anglaise seulement.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
©
International Organization for Standardization, 2008

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oSIST prEN ISO 21254-3:2009
ISO/DIS 21254-3
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ii ISO 2008 – All rights reserved

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oSIST prEN ISO 21254-3:2009
ISO/DIS 21254-3
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 Procedures .3
5.2.1 General .3
5.2.2 Type 1 Procedure .4
5.2.3 Type 2 Procedure .5
6 Accuracy .6
7 Test report.6
Annex A (informative) Test report example.7
Annex B (informative) Usage notes .11
Annex C (informative) Details of the derivation of the operating characteristic curve .15

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oSIST prEN ISO 21254-3:2009
ISO/DIS 21254-3
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 and by Technical Committee CEN/TC 123, Lasers and photonics in collaboration.
This second edition cancels and replaces the first edition (ISO 11254-1:2000, ISO 11254-2:2001 and
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 radiation-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).
Annexes A to C are for information only.
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oSIST prEN ISO 21254-3:2009
ISO/DIS 21254-3
Introduction
This part of ISO 21254 describes a test procedure for assurance of power density (energy density) handling
capability of optical components, both coated and uncoated.
This part of ISO 21254 provides a test procedure for obtaining consistent measurement results, which may be
used for acceptance tests or may be compared between different testing laboratories.
This testing procedure is applicable to all combinations of different laser wavelength and pulse length
durations. Comparison of laser damage threshold data may be misleading unless the measurements have
been done at identical wavelengths and pulse lengths.
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oSIST prEN ISO 21254-3:2009

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oSIST prEN ISO 21254-3:2009
DRAFT INTERNATIONAL STANDARD ISO/DIS 21254-3

Lasers and laser-related equipment — Test methods for laser
radiation-induced damage threshold —
Part 3:
Assurance of laser power (energy) handling capabilities
1 Scope
This standard is part of ISO 21254 and specifies a procedure by providing two test methods for assurance of
the power density (energy density) handling capability of optical surfaces.
The first method provides a rigorous test that fulfils requirements at a specified confidence level in the
knowledge of potential defects.
The second method provides a simple test for an empirically derived test level, allowing an inexpensive test.
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 10110-7:1996, Optics and optical instruments — Preparation of drawings for optical elements and
systems — Part 7: Surface imperfection tolerance.
ISO 11145, Optics and photonics — Lasers and laser-related equipment — Vocabulary and symbols
ISO/DIS 21254-1:2008, Lasers and laser-related equipment — Test methods for laser radiation-induced
damage threshold — Part 1: Definitions and general principles
ISO/DIS 21254-2:2008, Lasers and laser-related equipment — Test methods for laser radiation-induced
damage threshold — Part 2: Threshold determination
3 Terms and definitions
For the purposes of this document, terms and definitions given in ISO 11145, ISO/DIS 21254-1:2008 and the
following apply.
3.1
assurance level
Φ
the energy density/power density/linear power density of the laser radiation incident on the optical surface at
which the component is 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
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oSIST prEN ISO 21254-3:2009
ISO/DIS 21254-3
3.3
confidence level
γ
the probability of successful completion of the assurance test
3.4
flat-top beam
a 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
test site separation
d
sep
separation of test sites in terms of laser beam diameter
4 Symbols and units of measurement
Table 1 — Symbols and units of measurement
Symbol Unit Term
γ confidence level
f fraction of test area to be exposed
test
N number of damage initiation sites
d
φ 2 2 assurance level
J/cm , W/cm , W/cm
2
A cm assurance area
φ
2
A cm area to be tested
test
Ω horizontal overlap
x
Ω vertical overlap
y
d test site separation
sep
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oSIST prEN ISO 21254-3:2009
ISO/DIS 21254-3
5 Test methods
This standard provides a procedure that will give a high level of confidence to the power density (energy
density) handling capability of the component tested.
It may be used in a wide variety of applications, including: non-destructive inspection, witness sampling, lot
sampling and sub-aperture inspection. The level of confidence that the component does not c
...