| 摘要 |
A process for producing a polarizing beam splitter includes the steps of: forming a birefringent material layer made of an oriented film of an organic polymeric material on an optically isotropic substrate; applying a first heat treatment to the birefringent material layer to cause a change in color or stabilize its molecular structure; forming a periodic grating on said birefringent material layer defined by alternativly arranging exposed and non-exposed areas by applying a patterned exposure of ultraviolet light on said birefringent material layer; and applying a second heat treatment heat to stabilize said periodic grating at a temperature not higher than that for said first heat treatment after said periodic grating is formed.
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