Group Delay Dispersion Measurements of Novel Multilayer Interference Coatings in the Mid-Infrared Spectral Regime
Abstract
We present the methods and results for broadband group delay dispersion measurements for all-monocrystalline and amorphous-crystalline hybrid supermirrors, as well as an all-amorphous mirror in the wavelength range from 2.54.8 . Measurements are performed using a custom-built white light interferometer that allows for balanced and unbalanced measurement configurations. We compare the results to theoretical transfer-matrix method simulations and an alternative measurement using a commercial Fourier-transform infrared spectrometer. Additionally, we investigate group delay dispersion by direct differentiation using a local polynomial smoothing approach (Savitzky-Golay filter) and find strong consistency between our results, the theoretical prediction and the estimation using this method.
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