METHOD FOR SPECTRAL FILTRATION OF DIFFUSION RADIATION Russian patent published in 2014 - IPC G02F1/21 G02B5/28 

FIELD: physics, optics.

SUBSTANCE: invention relates to a method for spectral filtration of radiation using interference filters in conditions of low intensity and high divergence of radiation flux. Spectral filtration is carried out using a multilayer interference filter, having layers with a periodically varying refraction index. The interference filter also has a cellular structure passing on the entire thickness of the filter, said structure having vertical light-intercepting walls which splits radiation passing through the filter into separate light flux. Each light flux has a cross-section which is not greater than the spatial coherence area at given divergence of the light flux, and spectral filtration is carried out separately for each light flux.

EFFECT: high allowable divergence and recorded intensity of radiation.

2 dwg