Narrow interference fringes of thick layers can be used to determine the refractive index of the sample if the mechanical thickness of the layer is known. The new optical function ‘refractive index from fringes’ provides this functionality, analyzing interference maxima.
Spectra must be provided in wavenumbers. The function requires 5 parameters:
- wavenumber minimum of the relevant spectral range
- wavenumber maximum of the relevant spectral range
- Minimum height of an interference maximum
- Minimum separation of 2 neighbored maxima
- Mechanical thickness in microns
The following example shows how to write a function call:
R (refractive index from fringes 2800 2900 0.2 2.5 754)