HOLOGRAM FILTER (VERSIONS) Russian patent published in 2009 - IPC G02B5/20 G02B5/32 

FIELD: physics; optics.

SUBSTANCE: hologram filter relates to devices for filtering optical radiation. The filter consists of a transparent substrate, coated with a transparent polymer film which contains a reflection hologram, and a protective layer adjacent to the polymer film. In the first version, the protective layer is in form of an optical wedge, the working surface of which, except the radiation inlet window in the thin part of the wedge, is coated with a reflecting layer. In the second version the filter additionally contains a mirror, placed opposite the reflecting hologram with possibility of varying the angle between the mirror and the hologram. Upon double passage of radiation through the reflecting hologram at different angles of incidence, a narrow spectral peak of the passing radiation is obtained at the output.

EFFECT: obtaining half bandwidth of the order of several nanometres, high transmission coefficient in the bandwidth, high attenuation coefficient in the reject region, high beam strength.

2 cl, 9 dwg