ISO 17411:2022 PDF

Optics and photonics — Optical materials and components — Test method for homogeneity of optical glasses by laser interferometry

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Title (English):

ISO 17411:2022

Optics and photonics — Optical materials and components — Test method for homogeneity of optical glasses by laser interferometry

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 27
Publication date:: December 20, 2022
Edition:: ISO IS 17411 edition 2 version 1
ICS:: 37.020

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Description (English):

This document specifies the measuring method for the homogeneity of the refractive index of optical glasses by laser interferometry to cope with the grades from ISO 10110-18 and ISO 12123.

Technical details

Technical committee: ISO/TC 172/SC 3 - Optical materials and components
SKU: ISO 17411:2022

Abstract

Overview

ISO 17411:2022 - Optics and photonics: Test method for homogeneity of optical glasses by laser interferometry specifies laser-interferometric procedures to measure the homogeneity of the refractive index in optical glass. The standard defines test methods, measurement apparatus, preparation and operation steps, calculation and reporting to support grading systems in ISO 10110-18 and ISO 12123. It is the second edition (2022) and expands measurement options to include PHom, FT-PSI and SCI methods in addition to transmission and oil-on-plate approaches.

Key Topics and Technical Requirements

Measurement principle: Homogeneity is obtained from the peak-to-valley (PV) of the transmitted wavefront (W) measured by a laser interferometer; PV of refractive-index variation is derived from W.
Accepted methods:
- Transmission method - preferred for polished, plane-parallel parts; sensitive to surface deformation.
- PHom method - recommended for very high homogeneity (refractive index differences ≤ 2×10^-6); provides high trueness and precision.
- Oil-on-plate method - uses index-matching liquid between test part and a reference plate; easier preparation but requires matched liquids per glass type.
- FT-PSI and SCI methods - Fourier Transform Phase Shifting Interferometry and Spectrally Controlled Interferometry allow observation of linear-change components in refractive index.
Apparatus requirements: laser interferometer, interferogram analysis device, thermostatic chamber (ambient 20–25 °C; spatial/time fluctuation

Related standards

Mentioned in the description and other ISO standards

Overview

Key Topics and Technical Requirements

Measurement principle: Homogeneity is obtained from the peak-to-valley (PV) of the transmitted wavefront (W) measured by a laser interferometer; PV of refractive-index variation is derived from W.
Accepted methods:
- Transmission method - preferred for polished, plane-parallel parts; sensitive to surface deformation.
- PHom method - recommended for very high homogeneity (refractive index differences ≤ 2×10^-6); provides high trueness and precision.
- Oil-on-plate method - uses index-matching liquid between test part and a reference plate; easier preparation but requires matched liquids per glass type.
- FT-PSI and SCI methods - Fourier Transform Phase Shifting Interferometry and Spectrally Controlled Interferometry allow observation of linear-change components in refractive index.
Apparatus requirements: laser interferometer, interferogram analysis device, thermostatic chamber (ambient 20–25 °C; spatial/time fluctuation

ISO 17411:2022 PDF

Technical details

Abstract

Overview

Key Topics and Technical Requirements

Related standards

Abstract

Overview

Key Topics and Technical Requirements

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