HSI device with dielectric mirrors

To measure the phase dispersion due to the dielectric mirrors we have measured the spectra of different light sources as LEDS and laser with a reference laser at 532 nm. The black line is the measured phase correction as a function of wavelength for dielectric mirrors obtained by fitting with Airy functions the measured interferograms; the red squares are the phase measured with the dielectric HSI.

We have tested the HSI system by measuring the spectra of scenes containing sources with known spectra. Firstly, we measured the spectra of a scene containing four LEDs with different nominal wavelength peaks. The result is presented in the figure on the right where the black line is the spectrum extracted from the measured hypercube and the red line is the same spectrum measured with the reference spectrophotometer.

For this set of measurements the maximal cavity length of the F-P interferometer is about 15 micrometer. The limited resolution causes the HSI spectra to be slightly larger than the reference spectra.