Optics and photonics — Reference wavelengths

This document specifies reference wavelengths to be used for the characterization of optical materials, optical systems and instruments, and ophthalmic lenses. It defines the associated principal refractive indices and principal dispersions, as well as the Abbe numbers with regard to these reference wavelengths and principal dispersions.

Optique et photonique — Longueurs d'onde de référence

Le présent document définit des longueurs d'onde de référence à utiliser pour la caractérisation des matériaux optiques, des systèmes et des instruments d'optique et des verres ophtalmiques. Il définit les indices de réfraction principaux et les dispersions principales associées, ainsi que les nombres d'Abbe par rapport à ces longueurs d'onde de référence et aux dispersions principales.

General Information

Status
Published
Publication Date
21-Nov-2024
Current Stage
6060 - International Standard published
Start Date
22-Nov-2024
Due Date
24-Sep-2025
Completion Date
22-Nov-2024

Relations

Effective Date
12-Feb-2026
Effective Date
03-Dec-2022
Effective Date
22-Oct-2022

Overview

ISO 7944:2024, Optics and photonics - Reference wavelengths, is an international standard published by ISO. This document specifies standard reference wavelengths for the characterization of optical materials, optical systems, optical instruments, and ophthalmic lenses. It establishes the associated principal refractive indices, principal dispersions, and defines Abbe numbers relative to these reference wavelengths. By aiming to harmonize measurement practices, ISO 7944:2024 supports consistency and comparability across the optical and photonics industries worldwide.

Key Topics

  • Reference Wavelengths: The standard sets specific wavelengths to be used as benchmarks for optical measurements. The key reference wavelengths are:

    • Mercury e-line at 546.075 nm
    • Helium d-line at 587.562 nm
  • Principal Refractive Index: Definitions are provided for how to determine the refractive index of materials using the listed reference wavelengths.

  • Principal Dispersion and Abbe Numbers: The standard describes how to calculate the principal dispersion and Abbe number-critical parameters for understanding optical material performance.

  • Tables of Recommended Wavelengths: ISO 7944:2024 includes comprehensive tables of reference and recommended wavelengths in the ultraviolet, visible, infrared, and for common laser sources, ensuring wide coverage for various applications.

  • Standard Air Definition: For spectroscopic purposes, the standard specifies the use of ‘standard air’ conditions (101,325 kPa, 15°C, 0.033% CO₂, no H₂O) to ensure measurement reproducibility.

Applications

The practical value of ISO 7944:2024 lies in its universal reference framework for all professionals involved with optical materials or systems, including:

  • Optical Manufacturing: Producers of lenses, prisms, and other optical components use the reference wavelengths and associated indices to ensure materials meet precise specifications.

  • Ophthalmic Lenses: Eyewear designers require standardized refractive indices and dispersions for materials selection and lens performance validation.

  • Optical Instrumentation: Equipment manufacturers and calibration laboratories benefit from common measurement points, supporting accuracy in devices like spectrophotometers, microscopes, and telescopes.

  • Metrology and Quality Assurance: Laboratories performing refractive index measurements, material identification, or standards calibration rely on consistent reference wavelengths to ensure comparability and traceability of results.

  • Research and Development: Scientists and engineers developing new optical materials or technologies need universally accepted benchmarks for publishing and comparison.

By following ISO 7944:2024, organizations align with best practices, minimize ambiguities in material characterization, and facilitate international trade and collaboration in optics and photonics.

Related Standards

  • ISO 9802: Raw optical glass - Vocabulary: Provides terminology for optical glass, including terms related to dispersion and Abbe numbers referenced in ISO 7944:2024.

  • NIST Atomic Spectra Database: Source for spectral line data that underpins some of the recommended wavelengths listed in the standard.

  • Other optics standards (e.g., ISO 10110 series): Relate to the preparation and specification of optical elements and are often used alongside ISO 7944:2024 for comprehensive documentation.

By integrating ISO 7944:2024 into workflows and processes, organizations ensure scientifically credible, consistent characterization of optical systems, materials, and lenses, supporting innovation, compliance, and global interoperability in the optics and photonics industries.

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Frequently Asked Questions

ISO 7944:2024 is a standard published by the International Organization for Standardization (ISO). Its full title is "Optics and photonics — Reference wavelengths". This standard covers: This document specifies reference wavelengths to be used for the characterization of optical materials, optical systems and instruments, and ophthalmic lenses. It defines the associated principal refractive indices and principal dispersions, as well as the Abbe numbers with regard to these reference wavelengths and principal dispersions.

This document specifies reference wavelengths to be used for the characterization of optical materials, optical systems and instruments, and ophthalmic lenses. It defines the associated principal refractive indices and principal dispersions, as well as the Abbe numbers with regard to these reference wavelengths and principal dispersions.

ISO 7944:2024 is classified under the following ICS (International Classification for Standards) categories: 11.040.70 - Ophthalmic equipment; 17.180.01 - Optics and optical measurements in general. The ICS classification helps identify the subject area and facilitates finding related standards.

ISO 7944:2024 has the following relationships with other standards: It is inter standard links to EN ISO 7944:2024, ISO 23766:2022, ISO 7944:1998. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

ISO 7944:2024 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


International
Standard
ISO 7944
Third edition
Optics and photonics — Reference
2024-11
wavelengths
Optique et photonique — Longueurs d'onde de référence
Reference number
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Reference wavelengths, principal dispersions and Abbe numbers . 1
4.1 General .1
4.2 Mercury e-line 546,075 nm .1
4.3 Helium d-line 587,562 nm .2
4.4 Wavelength tables .2
Bibliography . 4

iii
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 document 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.
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, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 170, Ophthalmic optics, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second editi
...


Norme
internationale
ISO 7944
Troisième édition
Optique et photonique — Longueurs
2024-11
d'onde de référence
Optics and photonics — Reference wavelengths
Numéro de référence
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2024
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii
Sommaire Page
Avant-propos .iv
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Longueurs d'onde de référence, dispersions principales et nombres d'Abbe . 1
4.1 Généralités .1
4.2 Raie e du mercure 546,075 nm .1
4.3 Raie d de l’hélium 587,56 nm .2
4.4 Tableaux de longueurs d’onde .2
Bibliographie . 4

iii
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité et à l’applicabilité de
tout droit de propriété revendiqué à cet égard. À la date de publication du présent document, l’ISO n'avait pas
reçu notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d’avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/brevets. L’ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
tels droits de propriété.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion de
l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 172, Optique et photonique, en collaboration
avec le comité technique CEN/TC 170, Optique ophtalmique, du Comité européen de normalisation (CEN)
conformément à l’Accord de coopération technique entre l’ISO et le CEN (Accord de Vienne).
Cette troisième édition annule et remplace la deuxième édition (ISO 7944:1998). Il incorpore également le
Corrigendum technique ISO 7994:1998/Cor 1:2009, qui a fait l’objet d’une révision technique.
Les principales modifications sont les suivantes:
— la mise à j
...

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