Solid etalons are single polished substrates, either coated or uncoated. The optical path difference (opd) from point to point across the aperture is controlled during polishing and embodies the flatness and parallelism of the surfaces.

Optical Path Difference

l/10, l/20 or better

Mechanical Thickness

60 microns to 150mm or longer

Thickness Tolerance

Down to +/-1micron

Coatings

Customer specified