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Measurement of the group refractive index of air and glass

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Measurement of the group refractive index of air and glass

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  • Author: Petr Balling, Benjamin Sprenger
The dispersion in air (or another gasses) is measured by comb teeth resolving Fourier spectroscopy (described elsewhere). The dispersion can be evaluated from any comb teeth resolving spectra measured in air (gas) – the frequencies of comb teeth are known and wavelength ratios are measured by FT spectrometer. When processing the longer (three fringe packet) interferogram, the noise of the wavelength obtained by fitting a model function to the comb mode is about 0.5 % of inter-mode distance (0.5 % of Frep in frequency domain) for a single measurement.

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