Measurements of phase characteristics in optical coatings by resonance scanning interferometer

The transmittance spectrum of a RSI consists of spikes at resonant wavelengths. The distance between the resonant frequencies can be related to the average GD within that frequency interval. The GDD is obtain by differentiating GD. During this Bachelor thesis RSI was engineered. Few configurations of RSI were build: using halogen bulb; using laser. Experiments were conducted using sapphire window and silver mirror as second mirror in the Fabry-Perot interferometer. Measured spectres matches the modelled ones. Spectre obtained using metal mirror has much higher interference modulation and narrower peaks. The group delay calculated from the captured spectres has extremely bad signal to noise ratio