The main advantage of a concave grating is that it can be used as the primary dispersive and focusing element in an instrument. The concave grating reduces the number of optical elements required, increasing throughput and instrument efficiency.
Spectrum Scientific is one of the few companies in the world that can manufacture blazed holographic concave gratings, increasing efficiency particularly in the UV region.
There are typically three types of concave grating.
- Aberration Corrected Flat Field Imaging Grating
- Constant Deviation Monochromator Grating
- Rowland Type Concave Grating