Patent ID: 8092723

Claim:
A method of producing a diffraction grating by using a mold, which mold has a plurality of adjacent microscopic grooves, the inclination (φ) of said grooves being greater than or equal to 20 degrees and smaller than or equal to 70 degrees with respect to the normal (N) of the plane of the mold, the depth (h) of the grooves being greater than or equal to 0.4 times the grating period of the mold, the grating period of said mold being greater than or equal to 0.2 μm and smaller than or equal to 10 μm, and the clearance angle (γ) of said grooves being greater than or equal to 5 degrees and smaller than or equal to 20 degrees, said method comprising at least: applying an anti-adhesion layer to said mold to facilitate separation of the diffraction grating from said mold, applying curable substance to said mold, curing said substance at least partially to produce the diffraction grating, and separating said diffraction grating from said mold.