The classification of the grating.

Grating is divided into score grating, duplicate grating, holographic grating and so on.

Characterization of grating is made of diamond graver in thin metal surface coating machinery score;

Duplicate grating is with mother grating replication.Typical skinned grating and replicated grating groove is a triangle.

Holographic grating is composed of laser interference fringe photolithography.
Usually includes sine holographic grating groove, the score has the characteristics of high diffraction efficiency of grating holographic grating spectral range, low stray light, and can achieve high spectral resolution.