REPLICATION OF DIFFRACTION GRATINGS BY EMBOSSING TECHNIQUES
Original Publication Date: 1982-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Replication of optical elements incorporating surface relief gratings have typically been accomplished by using a cold molding process. In this process, a master grating or optical element is coated with a release agent and a blocking layer (normally an evaporated metal film). The coated master is then epoxied to a suitable substrate and the epoxy cured. When the pieces are separated, a replica of the information contained on the master surface is transferred to the substrate via the cured epoxy film. The master is recycled to produce additional replicas. Large scale volume production by this technique is relatively expensive since a large number of submasters are needed and because the process requires a vacuum deposition step and a time consuming curing step.