High Precision Replication

Once a master grating has been manufactured according to the techniques previously described, it can be replicated to produce exact copies of the original. A replica blank of high optical quality is coated with a layer of epoxy and “sandwiched” together with the master. When the epoxy is cured, the master and replica are separated and the epoxy layer remains attached to the replica substrate. The epoxy layer is now an exact copy of the grooves of the master, and this replica can now be coated with a reflective layer using vacuum deposition. It is possible to replicate gratings with many different shapes, including spherical and mildly aspheric surfaces.

High Precision Replication

The replication process is highly accurate. Replica gratings retain the diffracted wavefront, efficiency, and stray light characteristics of the master to a very high degree.

The reproducibility of replica gratings makes them ideal for high-volume production, and for scientific experiments in which a smaller quantity of absolutely identical gratings are required.