OPTICAL ELEMENT AND METHOD OF ITS MANUFACTURE Russian patent published in 2017 - IPC G02B1/12 C03C23/00 G02B5/00 G02B3/00 H01J29/00 

FIELD: physics.

SUBSTANCE: optical element contains an operational translucent and peripheral light-absorbing parts made of optical glass, which is composed of metal compounds. A light-absorbing part contains a layer of reduced lead oxide in the range of 0.3-0.5%, with a gradual increase in its concentration from the surface into the interior of the glass to ensure the reduction in refraction and light reflection from the layer-glass interface. The manufacturing method includes annealing a preform of an optical element from an optical glass in a reducing environment, followed by optical processing to ensure the transparency of the operational translucent part. In the annealing process, lead oxide is used as an additive in the range of 0.3-0.5%. Annealing is carried out at the temperature of 50°C-80°C above the dilatometric softening point of the optical glass with the accuracy of maintaining the temperature of ±5°C.

EFFECT: increasing the absorption coefficient of the light-absorbing part of the optical element while maintaining the optical and thermomechanical properties of the glass, reducing the need for additional optical processing.

2 cl, 6 dwg