FIELD: optoelectronics. SUBSTANCE: band-pass filter has coaxially installed polarizer, magneto-active member and analyzer, and device of controlling magnetic field. Magneto- active element is made of magnetic semiconducting spinel possessing jump of absorption in the region of wave length less than preset wave length of filter maximum and magneto-active element is placed in clearance of cup core being the source of magnetic field. Magneto-active element may be combined so that layer of magnetic semiconducting spinel optically contacts the layers of transparent magnetic. EFFECT: higher efficiency. 3 cl, 1 dwg
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