BLAZED DIFFRACTION OPTICAL ELEMENT, AND METHOD FOR MANUFACTURING BLAZED DIFFRACTION OPTICAL ELEMENT

摘要

This blazed diffraction optical element comprises: a blazed diffraction grating pair which has a first blazed member and a second blazed member, and which functions as a diffraction grating due to the first blazed member and the second blazed member; and an intermediate layer positioned between the first blazed member and the second blazed member, wherein, when the refractive index of the first blazed member is defined as Na, the refractive index of the intermediate layer as N, and the refractive index of the second blazed member as Nb, a magnitude relationship of Na>N>Nb is established.