prEN ISO 11145

SLOVENSKI STANDARD
01-junij-2025
Optika in fotonska tehnologija - Laserji in z laserji povezana oprema - Slovar in
simboli (ISO/DIS 11145:2025)
Optics and photonics - Lasers and laser-related equipment - Vocabulary and symbols
(ISO/DIS 11145:2025)
Optik und Photonik - Laser und Laseranlagen - Begriffe und Formelzeichen (ISO/DIS
11145:2025)
Optique et photonique - Lasers et équipements associés aux lasers - Vocabulaire et
symboles (ISO/DIS 11145:2025)
Ta slovenski standard je istoveten z: prEN ISO 11145
ICS:
01.040.31 Elektronika (Slovarji) Electronics (Vocabularies)
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 11145
ISO/TC 172/SC 9
Optics and photonics — Lasers
Secretariat: DIN
and laser-related equipment —
Voting begins on:
Vocabulary and symbols
2025-04-03
Optique et photonique — Lasers et équipements associés aux
Voting terminates on:
lasers — Vocabulaire et symboles
2025-06-26
ICS: 31.260; 01.040.31
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,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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.
Reference number
ISO/DIS 11145:2025(en)
DRAFT
ISO/DIS 11145:2025(en)
International
Standard
ISO/DIS 11145
ISO/TC 172/SC 9
Optics and photonics — Lasers
Secretariat: DIN
and laser-related equipment —
Voting begins on:
Vocabulary and symbols
Optique et photonique — Lasers et équipements associés aux
Voting terminates on:
lasers — Vocabulaire et symboles
ICS: 31.260; 01.040.31
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.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 11145:2025(en)
ii
ISO/DIS 11145:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Beam position .2
3.2 Beam axis .2
3.3 Beam diameter .3
3.4 Beam radius .3
3.5 Beam width . . .4
3.6 Beam cross-sectional area .4
3.7 Beam waist . .5
3.8 Divergence .7
3.9 Rayleigh length .7
3.10 Beam parameter product .8
3.11 Coherence .8
3.12 Polarization .9
3.13 Power and Energy .10
3.14 Pulse duration and repetition rate .11
3.15 Optical resonator .11
3.16 Mode. 12
3.17 Spectral bandwidth . 12
3.18 Relative intensity noise . . . 12
3.19 Laser . 12
3.20 Efficiency . 13
4 Symbols and units of measurement . 14
Annex A (informative) Explanation of the difference in terminology between IEC 60825-1 and
ISO 11145 . 16
Annex B (informative) List of symbols . 17
Bibliography .18
Alphabetical index . 19

iii
ISO/DIS 11145:2025(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 sixth edition cancels and replaces the fifths edition ISO 11145:2018, which has been technically revised.
The main changes compared to the previous edition are as follows:
— the term “power density” was replaced by “irradiance”, “energy density” was replaced by “fluence” and
“radiant” was added to “power (energy)”.
— To the Terms 3.3.1, 3.4.1, 3.6.1, 3.7.4, 3.7.6, 3.8.1 “encircled-power” was added.
— To the Terms 3.5.1 and 3.7.8 “slit-transmitted-power” was added.
— Term and definition 3.5.3 “principal axes” was newly added.
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
DRAFT International Standard ISO/DIS 11145:2025(en)
Optics and photonics — Lasers and laser-related equipment
— Vocabulary and symbols
1 Scope
This document defines basic terms, symbols, and units of measurement for the field of laser technology in
order to unify the terminology and to arrive at clear definitions and reproducible tests of beam parameters
and laser-oriented product properties.
NOTE The laser hierarchical vocabulary laid down in this document differs from that given in IEC 60825–1.
ISO and IEC have discussed this difference and agree that it reflects the different purposes for which the two standards
serve. For more details, see informative Annex A.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
NOTE 1 The spatial distribution of the irradiance (fluence) in a cross section of a laser beam does not always have
circular symmetry. In this document, all terms related to these spatial distributions are sp
...