Method and apparatus for optical pickup capable of...

Details Method and apparatus for optical pickup capable of... Method and apparatus for optical pickup capable of...

2007-05-22

2007-05-22

Lavarias, Arnel (Department: 2872)

Optical: systems and elements

Polarization without modulation

Polarization variation over surface of the medium

C359S576000, C356S365000, C369S116000

Reexamination Certificate

active

10124430

ABSTRACT:
A polarization split device that includes an optically isotropic substrate, an optically anisotropic film, and a diffraction grating. The optically anisotropic film is formed on the optically isotropic substrate. The diffraction grating includes first and second cyclically structural portions. The first cyclically structural portion is formed on a front surface of the optically anisotropic film such that a depression in a rectangular shape is cyclically arranged with a predetermined pitch. The second cyclically structural portion includes an optically transparent material having a refractive index approximately equivalent to a refractive index of the optically anisotropic film and is configured to cover the first cyclically structural portion. Diffraction light having a diffraction angle greater than a predetermined angle among diffraction light diffracted by the diffraction grating is inhibited from being discharged outside.

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