ISO 8237:2024

Optics and photonics — Optical materials and components — Specification of chalcogenide glass used in the infrared spectrum

This document defines chalcogenide glass correctly from a chemical perspective and specifies basic characterization and reporting of optical properties of chalcogenide glass used in the infrared spectral range from 0,78 um to 25 um

Optique et photonique — Matériaux et composants optiques — Spécification des verres de chalcogénure utilisés dans le spectre infrarouge

General Information

• Status: Published
• Publication Date: 25-Jun-2024
• ICS: 37.020 - Optical equipment
• Technical Committee: ISO/TC 172/SC 3 - Optical materials and components
• Drafting Committee: ISO/TC 172/SC 3 - Optical materials and components
• Current Stage: 6060 - International Standard published
• Start Date: 26-Jun-2024
• Due Date: 23-Aug-2024
• Completion Date: 26-Jun-2024

Standards Content (Sample)

International
Standard
ISO 8237
First edition
Optics and photonics — Optical
2024-06
materials and components —
Specification of chalcogenide glass
used in the infrared spectrum
Optique et photonique — Matériaux et composants optiques —
Spécification des verres de chalcogénure utilisés dans le spectre
infrarouge
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units. 3
5 Optical properties . 3
5.1 General .3
5.2 Transmittance .4
5.3 Refractive index .4
5.4 Temperature dependence of the refractive index .4
5.5 Relative partial dispersion .4
6 Tolerances . 4
6.1 General .4
6.2 Refractive index variation .5
6.3 Optical homogeneity (homogeneity of refractive index dn ) .5
λ
6.4 Striae .5
6.5 Bubbles and inclusions .6
7 Data sheet contents . 6
Bibliography . 8

iii
Foreword
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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
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iv
Introduction
This document applies to the specification of chalcogenide glass used in the infrared spectrum. Chalcogenide
glass described in this document is transparent in the infrared region.
Chalcogenide glass has a wide range of transparency from the visible to the infrared wavelength region. This
depends on chalcogenide chemical composition. The optical properties of chalcogenide glass can provide
flexibility and further capability for IR optical system.
Nowadays, chalcogenide glass is used as a substitute material for traditional infrared materials like
germanium, silicon or zinc selenide. The market for chalcogenide glasses is rapidly expanding. However, this
new material is sometimes distributed without specifying its properties and qualities, which can confuse
users. In consideration of the rapidly increasing of market for infrared application, the definition and
standardization of chalcogenide glass for infrared optics are necessary.

v
International Standard ISO 8237:2024(en)
Optics and photonics — Optical materials and components
— Specification of chalcogenide glass used in the infrared
spectrum
1 Scope
This document defines chalcogenide glass correctly from a chemical perspective and specifies basic
characterization and reporting of optical properties of chalcogenide glass used in the infrared spectral
range from 0,78 um to 25 um
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 12123:2018, Optics and photonics — Specification of raw optical glass
ISO 15368, Optics and photonics — Measurement of reflectance of plane surfaces and transmittance of plane
parallel elements
ISO 17328, Optics and photonics — Optical materials and components — Test method for refractive index of
infrared optical materials
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology 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/
3.1
glass
inorganic product, usually obtained after melting, cooling and annealing without crystallization; including
the solid state glass before production and the glass strip obtained in production
[SOURCE: ISO 9802:2022, 3.2.1]
3.2
chalcogenide glass
glass (3.1) compound comprising of at least one chalcogen element (group 16 in the periodic table) with the
exception of oxygen
Note 1 to entry: The compositions used in chalcogenide glass are sulfur (S), selenium (Se) and tellurium (Te).
Chalcogenide glass is also sometimes called sulfide glass, selenium glass or telluride glass depending on the most
abundant composition.
Note 2 to entry: Polonium (Po) and livermorium (Lv) are not typically considered for chalcogenide compositions.

3.3
regular transmittance
ratio of the regularly transmitted part of the (whole) transmitted flux to the incident flux
[SOURCE: ISO 11382:2010, 3.1]
Note 1 to entry: Typical transmittance spectra of glass is shown in Figure 1.
Key
X wavelength, λ, in micrometre
Y transmittance, τ , in percent
r
1 transmittance spectra of sulfide glass
2 tr
...