GB/T 40293-2021Test method for refractive index of infrared optical chalcogenide films (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard describes the test principle, test conditions, equipment, samples, Test procedure, data processing and refractive index calculation, calculation accuracy and test report.

This standard applies to the test of the refractive index of infrared chalcogenide optical films, and the test of the refractive index of other optical films can be used as a reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 33826-2017 Nano film thickness measurement on glass substrate stylus profilometer method

GB/T 36969-2018 Nanotechnology Atomic Force Microscopy Method for Measuring the Thickness of Nano Films

3 Terms and definitions

The following terms and definitions apply to this document.

4 Principle

The principle is shown in Figure 1. First, place the samples on the spectrophotometer and Fourier infrared spectrometer test benches, so that the test light Pass the sample vertically; secondly, set the spectral test range, measure the spectral transmittance T(lambda) of the sample, and then combine the principle of multi-beam interference to obtain the Formula (1) ~ Formula (3).

TM=T(n,d,alpha) (1)

Tm=T(n,d,alpha) (2)

2nd=mlambda (3)

Where:

TM --- the upper envelope of the transmittance curve;

Tm --- the lower envelope of the transmittance curve; […]