prEN ISO 13694 rev
(Main)Optics and photonics - Lasers and laser-related equipment - Test methods for laser beam irradiance (fluence) distribution (ISO/DIS 13694:2025)
Optics and photonics - Lasers and laser-related equipment - Test methods for laser beam irradiance (fluence) distribution (ISO/DIS 13694:2025)
This document specifies methods by which the measurement of power (energy) density distribution is made and defines parameters for the characterization of the spatial properties of laser power (energy)density distribution functions at a given plane.
The methods given in this document are intended to be used for the testing and characterization of both continuous wave (cw) and pulsed laser beams used in optics and optical instruments.
This document provides definitions of terms and symbols to be used in referring to power density distribution, as well as requirements for its measurement. For pulsed lasers, the distribution of time-integrated power density (i.e. energy density) is the quantity most often measured.
Optik und Photonik - Laser und Laseranlagen - Prüfverfahren für die Leistungs-(Energie‑)dichteverteilung von Laserstrahlen (ISO/DIS 13694:2025)
Optique et photonique - Lasers et équipements associés aux lasers - Méthodes d’essai de distribution de l’éclairement énergétique (exposition énergétique) du faisceau laser (ISO/DIS 13694:2025)
Le présent document spécifie des méthodes permettant de procéder au mesurage de la distribution de densité de puissance (d'énergie) et définit les paramètres de caractérisation des propriétés spatiales des fonctions de distribution de densité de puissance (d'énergie) laser dans un plan donné.
Les méthodes d'essai données dans le présent document sont destinées à être utilisées dans le cadre des essais et de la caractérisation des faisceaux laser continus et impulsionnels.
Le présent document donne des définitions de la terminologie et des symboles à utiliser dans le cadre de la distribution de la densité de puissance, ainsi que les spécifications relatives au mesurage de cette distribution. Pour les lasers impulsionnels, la distribution de la densité de puissance intégrée sur le temps (c'est-à-dire la densité d'énergie) représente la grandeur la plus souvent mesurée.
Optika in fotonska tehnologija - Laserji in laserska oprema - Metode za preskušanje porazdelitve obsevanosti (fluence) laserskega žarka (ISO/DIS 13694:2025)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2025
Optika in fotonska tehnologija - Laserji in laserska oprema - Metode za
preskušanje porazdelitve obsevanosti (fluence) laserskega žarka (ISO/DIS
13694:2025)
Optics and photonics - Lasers and laser-related equipment - Test methods for laser
beam irradiance (fluence) distribution (ISO/DIS 13694:2025)
Optik und Photonik - Laser und Laseranlagen - Prüfverfahren für die Leistungs-
(Energie‑)dichteverteilung von Laserstrahlen (ISO/DIS 13694:2025)
Optique et photonique - Lasers et équipements associés aux lasers - Méthodes d’essai
de distribution de l’éclairement énergétique (exposition énergétique) du faisceau laser
(ISO/DIS 13694:2025)
Ta slovenski standard je istoveten z: prEN ISO 13694 rev
ICS:
11.040.70 Oftalmološka oprema Ophthalmic equipment
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 13694
ISO/TC 172/SC 9
Optics and photonics — Lasers and
Secretariat: DIN
laser-related equipment — Test
Voting begins on:
methods for laser beam irradiance
2025-04-17
(fluence) distribution
Voting terminates on:
2025-07-10
Optique et photonique — Lasers et équipements associés aux
lasers - Méthodes d'essai de distribution d'irradiance (fluence) du
faisceau laser
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.
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Reference number
ISO/DIS 13694:2025(en)
DRAFT
ISO/DIS 13694:2025(en)
International
Standard
ISO/DIS 13694
ISO/TC 172/SC 9
Optics and photonics — Lasers and
Secretariat: DIN
laser-related equipment — Test
Voting begins on:
methods for laser beam irradiance
(fluence) distribution
Voting terminates on:
Optique et photonique — Lasers et équipements associés aux
lasers - Méthodes d'essai de distribution d'irradiance (fluence) du
faisceau laser
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
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Published in Switzerland Reference number
ISO/DIS 13694:2025(en)
ii
ISO/DIS 13694:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Measured quantities .1
3.2 Characterizing parameters .3
4 Coordinate system . 8
5 Characterizing parameters derived from the measured spatial distribution . 8
6 Test principle . 9
7 Measurement arrangement and test equipment . 9
7.1 General .9
7.2 Preparation .9
7.3 Control of environment . .9
7.4 Detector system.9
7.5 Beam-forming optics, optical attenuators, and beam splitters .10
8 Test procedure .10
8.1 Equipment preparation . .10
8.2 Detector calibration procedure .11
8.2.1 Spatial calibration .11
8.2.2 Radiant power (energy) calibration .11
8.3 Data recording and noise correction .11
8.3.1 General .11
8.3.2 Correction by background-map subtraction . 12
8.3.3 Correction by average background subtraction . 12
9 Evaluation .13
10 Test report .13
Annex A (informative) Test report . 14
Bibliography . 17
iii
ISO/DIS 13694:2025(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).
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. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 9,
Laser and electro-optical systems.
This fourth edition cancels and replaces the third edition (ISO 13694:2018), which has been technically
revised. The main changes compared to the previous edition are as follows:
a) Terminologies “power”, “energy”, “power density”, and “energy density” were replaced by “radiant
power”, “radiant energy”, “irradiance”, and “fluence”, respectively, in order to be consistent with
ISO 8000-7 and IEC Electropedia (https://www.electropedia.org/).
b) The terminologies “beam width” and “beam diameter” were restricted to be used only for those given
by the second order moment which is defined in ISO 11146-1, and new terminologies “encircled-power
beam width”, “encircled-power beam diameter”, “clip-level beam width”, and “clip-level beam diameter”
were introduced, in order to avoid confusion of plural definitions.
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 13694:2025(en)
Introduction
Many applications of lasers involve using the near-field as well as the far-field irradiance (fluence)
distribution of the beam. The irradiance (fluence) distribution of a laser beam is characterized by the spatial
distribution of radiant power density (radiant energy fluence) with lateral displacement in a particular plane
perpendicular to the direction of propagation. In general, the irradiance (fluence) distribution of the beam
changes along the direction of propagation. Depending on the radiant power (energy), size, wavelength,
polarization, and coherence of the beam, different methods of measurement are applicable in different
situations. Five methods are commonly used: camera arrays (1D and 2D), apertures, pinholes, slits, and
knife edges.
According to ISO 11145, it is possible to use two different definitions for describing and measuring the laser
beam diameter. One definition is based on the measurement of the encircled radiant power (energy); the
other is based on determining the spatial moments of the irradiance (fluence) distribution of the laser beam.
The use of spatial moments is necess
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