BASE MATERIAL TO BE PLOTTED, METALLIC MOLD FOR THE BASE MATERIAL, OPTICAL PICKUP DEVICE, METHOD FOR MACHINING OPTICAL ELEMENT, BASE MATERIAL MACHINED BY THE METHOD, ELECTRON BEAM PLOTTING DEVICE AND OPTICAL ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a base material to be plotted which contributes to miniaturize a device while preventing the deterioration of the productivity of an optical pickup device, an optical element or the like, a metallic mold for the base material, an optical pickup device, a method for machining an optical element, a base material machined by the method, an electron beam plotting device and an optical element. SOLUTION: The device includes a first optical element which transforms laser beam emitted from a laser source into a parallel beam, a second optical element which converges the parallel beam and a light receiving element which receives the converged laser beam after the laser beam reflected on an optoelectromagnetic medium is transformed into a parallel beam via the second light element and is converged with the first optical element. Recorded information on the magneto-optical recording medium is read out on the basis of the output of the light receiving element. The first optical element has a polarized light separation structure which separates the parallel light into a plurality of luminous flux composed of both P and S polarized light beams of which optical paths are close to each other. The second optical element has a double refractivity structure which gives a phase difference between at least two luminous flux of P and S polarized light beams among the plurality of luminous flux.