A Fourier-transform hyperspectral camera based on a common-path interferometer working from 400 to 2200 nm

We introduce a FT-hyperspectral imager that incorporates an ultra-broadband common-path birefringent interferometer and we demonstrate the capabilities of the system in the spectral range from 400 to 2200 nm. The intereferometric system was coupled initially to a first sensor, covering the spectral range 400-1700 nm, and later to a second sensor, allowing it to cover the region from 1200 to 2200 nm. The broadband working range enabled the simultaneous identification of chlorophyll and water content from intact leaf materials and the identification of spectral characteristics of pigments widely used from antiquity to the present day.