DIFFRACTION GRATING, ISOLATOR, AND OPTICAL PICKUP APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a diffraction grating having polarization characteristics with a simple structure at low costs, to provide an isolator and to provide an optical pickup apparatus.

SOLUTION: A plurality of protrusion parts 3 are formed by using a polyimide having birefringence as a grating material on a glass transparent substrate 2 composed of a transparent base material such as glass. The plurality of the protrusion parts 3 are formed on the glass transparent substrate 2 at a prescribed interval. The glass transparent substrate 2 including the protrusion parts 3 is coated with a resin 4.

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