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From a plurality of alternately high - and lower-refractive-index light-transmitting layers, applied on a light-transmitting traeger within a predetermined corrugated layers to a certain narrow range corrugated layers reflecting narrow band, the radiation of the remaining parts of the stated range outlet end through interference filter
From a plurality of alternately high - and lower-refractive-index light-transmitting layers, applied on a light-transmitting traeger within a predetermined corrugated layers to a certain narrow range corrugated layers reflecting narrow band, the radiation of the remaining parts of the stated range outlet end through interference filter