Abstract: A wavelength tunable light source based on a Volume Bragg Grating (VBG) receives a broadband light beam and outputs a diffracted light beam. The spectral profile of the diffracted light beam includes a selected waveband of the broadband light beam accompanied by out-of-band features spatially dispersed by the VBG. The light source further includes a wavelength tuning mechanism, such as a Theta-2Theta rotation system, comprising a VBG rotation stage operable to rotate the VBG to change the incidence angle by a VBG rotation angle, and a displacement device configured to change a relative alignment between the light input and the light output paths by twice the VBG rotation angle. The light output path has an opening sized to allow at least a portion of the selected waveband through while substantially blocking the out-of-band features.

Abstract: The invention relates to a process for treating water in an installation comprising a plurality of filtration units, said process comprising at least one step of filtration of said water in said filtration units under initial filtration conditions, and an optional step of modification of the value of at least one controlled parameter within a tolerance interval.