Master Grating vs Replica Grating
In nearly all cases the optical performance of a replica diffraction grating is virtually indistinguishable from the performance of the master from which it has been produced. There are very few applications that benefit from using a master grating instead of a replica grating. Replica gratings are also generally lower in cost than master gratings (especially for volume production) and will exhibit better consistency from grating to grating.
SSI’s proprietary blazing technique also means that our replica blazed gratings exhibit significantly lower stray light compared to gratings produced using other types of blazing methods.