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