Gradient filter is a kind of filter that changes its spectral properties along one dimension. For each physical point along one dimension spectral curve is shifted in
wavelength domain. Solaris Optics has already designed and produced a few different products and one of them is gradient filter that is a part of Sentinel-5 space project.
Gradient coatings properties can change along one dimension (linear) or radial. All depends on the requirements and Solaris Optics can analyze and propose solution for different applications.