A diffraction optical element wherein a plurality of diffraction gratings
formed of at least two kinds of materials differing in dispersion are
laminated, at least two of the plurality of diffraction gratings are
formed on a curved surface and adjacent to each other, and these two
adjacent diffraction gratings are equal to each other in the shape of a
curved tip plane in which the tips of respective grating portions are
ranged.
Um elemento ótico wherein um plurality dos gratings de diffraction dados forma ao menos de dois tipos dos materiais que diferem na dispersão é laminado, ao menos dois do diffraction do plurality de gratings de diffraction é dado forma em uma superfície curvada e junto a se, e estes dois gratings de diffraction adjacentes são iguais a se na forma de um plano curvado da ponta em que as pontas de parcelas grating respectivas são variadas.
