Birefringence diffraction grating type polarizer
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United States of America Patent
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-
Feb 12, 1991
Grant Date -
N/A
app pub date -
Jun 27, 1989
filing date -
Jun 29, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a birefringence diffraction grating type polarizer, periodical proton ion-exchanged regions are provided on the principal plane of an optically anisotropic crystal substrate to provide an optical diffraction grating, and a dielectric layer is provided on each of the periodical proton ion-exchanged regions. The refractive index of the dielectric layer is proximate or equal to that of the crystal substrate, and the whole surface of the optical diffraction grating is covered by an anti-reflection layer of a single material having a uniform thickness.
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