Optical component and coating system for coating substrates for optical components
View Patent ↗An optical component and a coating system for coating substrates for optical components with essentially rotationally symmetric coatings, the system having a planetary-drive system ( 1 ) that has a rotating planet carrier ( 2 ) and several planets ( 4 ), each of which carries a single substrate, that corotate both with the planet carrier and with respect to the primary carrier. In one embodiment a set of stationary first masks ( 20 ) that allow controlling the radial variation in physical film thickness is arranged between a source ( 8 ) of material situated beneath the planets and the substrates. A set of second masks that mask off evaporation angles exceeding a limiting evaporation or incidence angle (β max) for every substrate also corotate with the primary carrier ( 2 ), which allows depositing coatings having a prescribed radial film-thickness distribution and a virtually constant density of the coating material over their full radial extents for relatively low, and only slightly varying, evaporation angles.
1. Optical component comprising:
a substrate having at least one curved coating surface to which an optical coating that is rotationally symmetric with respect to a symmetry axis is applied,
wherein the absolute value of a ratio of a diameter of the coating surface to a radius of curvature of the coating surface exceeds approximately 2/3,
wherein a density of the optical coating varies by less than 20% over a radius of the coating, and
wherein the optical coating has a physical thickness continually increasing in a radial direction, from the symmetry axis to a perimeter of the optical component.
2. Optical component according to claim 1 , wherein the density of the optical coating differs from a mean density of the optical coating at a location of the symmetry axis by less than ±10% over the radius of the coating.
3. Optical component according to claim 1 , wherein the optical coating has a physical thickness monotonically increasing in a radial direction, from the symmetry axis to the perimeter of the optical component.
4. Optical component according to claim 1 , wherein a physical thickness of the optical coating at the perimeter exceeds that in the vicinity of the symmetry axis by at least 5%.
5. Optical component according to claim 1 , the optical component being one of a lens and a mirror.