ISO 22576:2020 PDF

Name: ISO 22576:2020 — Optics and photonics — Optical materials and components — Specification of calcium fluoride used in the infrared spectrum
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Optics and photonics — Optical materials and components — Specification of calcium fluoride used in the infrared spectrum

Название (английский):

ISO 22576:2020

Optics and photonics — Optical materials and components — Specification of calcium fluoride used in the infrared spectrum

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 16 апреля 2020 г.
Издание:: ISO IS 22576 edition 1 version 1
ICS:: 37.020

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Описание (английский):

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).

Abstract

Overview

Key Topics

Refractive index variation: ISO 22576 defines graded classes (NP grades) for the maximum difference between measured and nominal refractive index. This supports material selection and consistency in optical design.
Optical homogeneity: Homogeneity classes (NH grades) specify allowable refractive index variation across a piece, which is critical for wavefront quality and minimizing image degradation in IR systems.
Bubbles and inclusions: The standard defines classes (IC/IN grades) for permissible bubble cross-sections and counts per volume to control scattering and absorption in IR components.
Indications and classifications: Table-based classifications (A–E) combine absorption bands and the optical quality grades to guide procurement and specification for different end uses.
Nominal refractive index data: Annex A provides measured refractive index values across wavelengths (measured at 24 °C and ambient pressure), offering designers reference indices for common IR wavelengths.

Why these topics matter

Ensuring consistent refractive index and homogeneity reduces risk of focal shift and aberrations in IR optical systems.
Controlled inclusion and bubble limits improve throughput and lower stray light or scattering in sensitive detectors.

Applications

ISO 22576 is directly applicable to the specification, procurement and quality control of calcium fluoride used in:

IR optical windows and domes for thermal imaging and spectroscopy
Infrared lenses for cameras, scanning systems and focal plane assemblies
Optical elements in gas analyzers, CO/CO2 laser optics and other mid-IR instrumentation
Components for aerospace, defense and scientific instrumentation where IR transmission and low scattering are required

Practical uses include writing procurement specs, establishing acceptance criteria in incoming inspection, and aligning material grades with optical design tolerances.

Related Standards

ISO 22576 references and aligns with several optics standards to ensure consistent terminology and test methods, including:

ISO 10110-18 - preparation of drawings for stress birefringence, homogeneity and inclusions
ISO 12123 - specification of raw optical glass (terms and quality assessment)
ISO 15368 - measurement methods for transmittance and reflectance of plane parallel elements

For implementation, designers and quality managers should cross-reference ISO 22576 with these documents to define test methods, drawing notation and acceptance criteria for calcium fluoride IR components.