DIELECTRIC MIRROR

摘要

A dielectric mirror includes a coating having alternating high and low index layers. The mirror coating has no metallic reflective layer, and may have film side and/or glass side visible reflection of from about 50-90% (more preferably from about 60-80% and most preferably from about 65-75%) and visible transmission of from about 10-50% (more preferably from about 20-40%, and most preferably from about 25-35%).

主权项

1. A dielectric mirror including a glass substrate supporting a coating, the coating comprising moving away from the glass substrate:
a first transparent dielectric high refractive index layer comprising niobium oxide, the first transparent dielectric high refractive index layer having a thickness of from about 70-140 nm; a second transparent dielectric low refractive index layer comprising silicon oxide, the second transparent dielectric low refractive index layer having a thickness of from about 30-140 nm; a third transparent dielectric high refractive index layer comprising niobium oxide; a fourth transparent dielectric low refractive index layer comprising silicon oxide; a fifth transparent dielectric high index layer comprising niobium oxide; wherein the first transparent dielectric high index layer comprising niobium oxide is at least 10 nm thicker than one or both of the third transparent dielectric high refractive index layer comprising niobium oxide and/or the fifth transparent dielectric high index layer comprising niobium oxide; wherein the coating does not contain any metallic reflective layer; and wherein the dielectric mirror has a visible film side reflectance and/or a visible glass side reflectance of from about 50-90%, and visible transmission of from about 20-40%.