Method of manufacturing blazed diffractive grating and method of manufacturing mold for manufacturing blazed diffractive grating

摘要

A method of manufacturing a blazed diffractive grating includes a first step of forming a first groove having a first surface (2b) and a second surface (3b) by moving, in the first direction at a first position in the second direction, a cutting tool (12) having a first cutting blade and a second cutting blade to cut the object (13); a second step of forming a second groove by moving, in the first direction at a second position separated from the first position in the second direction by a grating pitch, the cutting tool to cut the object; and a third step of forming a blazed surface (2'b) of the first groove using the first cutting blade by moving, in the first direction at a third position between the first position and the second position, the cutting tool to cut the first surface of the first groove.