ISO 22576:2020
(Main)Optics and photonics — Optical materials and components — Specification of calcium fluoride used in the infrared spectrum
Optics and photonics — Optical materials and components — Specification of calcium fluoride used in the infrared spectrum
This document specifies calcium fluoride used in the infrared spectral range from 0,78 µm to 10 µm. The material specified in this document can also transmit light in other spectral domains (ultraviolet and visible).
Optique et photonique — Matériaux et composants optiques — Spécification de fluorure de calcium utilisé dans le spectre infrarouge
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22576
First edition
2020-04
Optics and photonics — Optical
materials and components —
Specification of calcium fluoride used
in the infrared spectrum
Optique et photonique — Matériaux et composants optiques —
Spécification de fluorure de calcium utilisé dans le spectre infrarouge
Reference number
ISO 22576:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 22576:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22576:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Tolerances . 2
4.1 Refractive index variation. 2
4.2 Optical homogeneity (homogeneity of refractive index) . 3
4.3 Bubbles and inclusions . 3
5 Indications . 3
Annex A (informative) The nominal refractive index of calcium fluoride . 4
Bibliography . 5
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 22576:2020(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.
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 3, Optical materials and components.
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 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 22576:2020(E)
Introduction
This document applies to the classification of calcium fluoride used in the infrared spectrum.
Calcium fluoride is used for infrared optical systems such as optical windows and lenses. The
specifications for its use in the infrared spectrum are different than those used in the visible range.
The crystal structure of calcium fluoride is referred to as the fluorite structure. A single crystal of
calcium fluoride is composed of the crystal lattice with no grain boundaries. The birefringence of the
crystal depends on the light propagation direction with respect to the crystal axis.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 22576:2020(E)
Optics and photonics — Optical materials and components
— Specification of calcium fluoride used in the infrared
spectrum
1 Scope
This document specifies calcium fluoride used in the infrared spectral range from 0,78 µm to 10 µm.
The material specified in this document can also transmit light in other spectral domains (ultraviolet
and visible).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 10110-18, Optics and photonics — Preparation of drawings for optical elements and systems — Part 18:
Stress birefringence,
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.