Patent
1989-06-27
1991-02-12
Arnold, Bruce Y.
35016217, 350166, G02B 518, G02B 530
Patent
active
049919377
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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Jackel et al., "Proton Exchange For High-Index Waveguides In LiNbO.sub.3," Applied Physics Letters, vol. 41, No. 7, Oct. 1, 1982, pp 607-608.
National Conference Record, 1982, Optical & Radio Wave Electronics, the Institute of Electronics & Communication Engineers of Japan, Part 2 (pp. 2-79).
Arnold Bruce Y.
Lerner Martin
NEC Corporation
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