prEN ISO 11551
(Main)Optics and photonics - Lasers and laser-related equipment - Test method for absorptance of optical laser components (ISO/DIS 11551:2025)
Optics and photonics - Lasers and laser-related equipment - Test method for absorptance of optical laser components (ISO/DIS 11551:2025)
This document specifies procedures and techniques for obtaining comparable values for the absorptance of optical laser components.
Optik und Photonik - Laser und Laseranlagen - Prüfverfahren für den Absorptionsgrad von optischen Laserkomponenten (ISO/DIS 11551:2025)
Optique et photonique - Lasers et équipements associés aux lasers - Méthode d'essai du facteur d'absorption des composants optiques pour lasers (ISO/DIS 11551:2025)
Le présent document spécifie les modes opératoires et les techniques utilisés pour obtenir des valeurs comparables du facteur d'absorption des composants optiques pour lasers.
Optika in optični instrumenti - Laserji in laserska oprema - Preskusna metoda za absorpcijo optičnih laserskih komponent (ISO/DIS 11551:2025)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Optika in optični instrumenti - Laserji in laserska oprema - Preskusna metoda za
absorpcijo optičnih laserskih komponent (ISO/DIS 11551:2025)
Optics and photonics - Lasers and laser-related equipment - Test method for
absorptance of optical laser components (ISO/DIS 11551:2025)
Optik und Photonik - Laser und Laseranlagen - Prüfverfahren für den Absorptionsgrad
von optischen Laserkomponenten (ISO/DIS 11551:2025)
Optique et photonique - Lasers et équipements associés aux lasers - Méthode d'essai du
facteur d'absorption des composants optiques pour lasers (ISO/DIS 11551:2025)
Ta slovenski standard je istoveten z: prEN ISO 11551
ICS:
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 11551
ISO/TC 172/SC 9
Optics and photonics — Lasers and
Secretariat: DIN
laser-related equipment — Test
Voting begins on:
method for absorptance of optical
2025-05-22
laser components
Voting terminates on:
2025-08-14
Optique et photonique — Lasers et équipements associés aux
lasers — Méthode d'essai du facteur d'absorption des composants
optiques pour lasers
ICS: 31.260
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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STANDARDS MAY ON OCCASION HAVE TO
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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.
Reference number
ISO/DIS 11551:2025(en)
DRAFT
ISO/DIS 11551:2025(en)
International
Standard
ISO/DIS 11551
ISO/TC 172/SC 9
Optics and photonics — Lasers and
Secretariat: DIN
laser-related equipment — Test
Voting begins on:
method for absorptance of optical
laser components
Voting terminates on:
Optique et photonique — Lasers et équipements associés aux
lasers — Méthode d'essai du facteur d'absorption des composants
optiques pour lasers
ICS: 31.260
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
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Published in Switzerland Reference number
ISO/DIS 11551:2025(en)
ii
ISO/DIS 11551:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units of measure . 1
5 Preparation of test sample and measuring arrangement . 2
6 Characteristic features of the laser radiation . 4
7 Test procedure . 4
7.1 General .4
7.2 Calibration .4
7.2.1 Calibration of the radiant power signal .4
7.2.2 Calibration of the temperature signal .4
7.2.3 Calibration of the thermal response .4
7.2.4 Measurement of the background signal .5
7.3 Determining the absorptance .5
8 Evaluation . 6
8.1 General .6
8.2 Elimination of drift .6
8.3 Exponential method .6
8.4 Pulse method .7
9 Test report . 8
Annex A (informative) Effects changing absorptance . 10
Annex B (informative) Influence of signal distortions .13
Annex C (informative) Algorithm for parameterizing the temperature data .16
Bibliography . 17
iii
ISO/DIS 11551:2025(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee 172, Optics and Photonics, Subcommittee SC 09, Laser
and electro-optical systems.
This fourth edition cancels and replaces the third edition (ISO 11551:2019), which has been technically
revised.
The main changes are as follows:
— harmonization of terms and environmental conditions to current laser measurement standards;
— minor adjustments of equations and figures;
— modified text and additional figures in sections A1 and A3 of Annex A
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/DIS 11551:2025(en)
Introduction
To characterize an optical component, it is important to know its absorptance. When radiation impinges
upon a component, a part of that radiation is absorbed, increasing the temperature of the component. In this
document only the part of the absorbed radiant power/energy, that is converted into heat, is measured. If
enough radiant energy is absorbed, the optical properties of the component can change, and the component
can even be destroyed. Absorptance is the ratio of the radiant flux absorbed to the radiant flux of the incident
radiation.
In the procedures described in this document, the absorptance is determined calorimetrically as the ratio
of radiant power or radiant energy absorbed by the component to the total radiant power or radiant energy,
respectively, impinging upon the component. The assumption is made that the absorptance of the test sample
is constant within the temperature fluctuations experienced by the component during the measurement.
v
DRAFT International Standard ISO/DIS 11551:2025(en)
Optics and photonics — Lasers and laser-related equipment
— Test method for absorptance of optical laser components
WARNING — Laser calorimetric measurements may involve high power lasers, the use of which
may come with significant risks, which may include, but are not limited to; eye injury to people;
laser burns to people or equipment; ignition of materials; generating debris of toxic materials in
the substrate or coating; electrical hazards. It is the responsibility of the user to comply with local
guidelines and regulations for their particular set-up.
1 Scope
This document specifies procedures and techniques for obtaining comparable values for the absorptance of
optical laser components.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitut
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