NON-REFLECTING NEUTRAL OPTICAL FILTER Russian patent published in 2010 - IPC G02B5/22 

FIELD: physics; optics.

SUBSTANCE: non-reflecting neutral optical filter includes a substrate which is transparent in the 0.4-0.7 mcm spectral range and a partially transparent titanium layer and anti-reflecting titanium dioxide layer placed on the substrate in series. Geometrical thickness of the titanium dioxide layer is equal to 0.04-0.045 mcµm and the geometrical thickness of the titanium layer equals 0.014-0.018 mcm.

EFFECT: increased spectral transmittance of the non-reflecting neutral optical filter.

2 dwg, 3 ex