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Diffraction grating, method of fabricating diffraction optical element, optical pickup device, and optical disk drive

机译:衍射光栅,衍射光学元件的制造方法,光拾取装置和光盘驱动器

摘要

A diffraction grating with periodically arranged protrusions and grooves at a relatively narrow pitch and improved diffraction efficiency is disclosed. The protrusions of the grating are made of a material whose index of refraction is greater than that of the grooves, and the ratio of the width D of the protrusion to the pitch Λ of the protrusion is set equal to or less than 0.4 (D/Λ≦0.4).
机译:本发明公开了一种衍射光栅,其具有以相对窄的节距周期性地布置的突起和凹槽并且提高了衍射效率。光栅的突起由折射率大于凹槽的折射率的材料制成,并且突起的宽度D与突起的节距Λ之比设定为等于或小于0.4(D / Λ≤0.4)。

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