Patent ID: 9435921
Filing Date: 2016-09-06
CPC Classification: G02B

Claim Text:
1. A blazed grating filter, comprising: a substrate, said substrate having a substantially planar upper surface positioned in a first plane and a substantially planar bottom surface positioned in a second plane, wherein said first plane is oriented at an angle relative to said second plane and wherein said angle corresponds to a blaze angle of said blazed grating filter; a multilayer stack comprised of a plurality of multilayer pairs positioned above said upper surface of said substrate, wherein an uppermost surface of said multilayer stack is positioned in a third plane that is substantially parallel with said second plane; a plurality of recesses positioned in an upper portion of said multilayer stack; and at least one capping layer positioned above at least said uppermost surface of said multilayer stack and above at least a bottom surface of each of said recesses.