Optical element and method of fabricating the same

Details Optical element and method of fabricating the same Optical element and method of fabricating the same

1993-04-06

1994-11-22

Lerner, Martin

Optical: systems and elements

Polarization without modulation

Depolarization

359495, 359566, 359569, 385 11, G02B 518, G02B 530, G02B 2728

Patent

active

053674030

ABSTRACT:
An optical element includes a crystal of LiTa.sub.X Nb.sub.1-X O.sub.3 which has one of an x-surface and a y-surface, where X denotes an atomic fraction and 0.ltoreq.X.ltoreq.1. Proton-exchanged layers periodically extend on one of the x-surface and the y-surface of the crystal. Grooves extend in said one of the x-surface and the y-surface of the crystal, and have bottoms which are defined by surfaces of the proton-exchanged layers. Ordinary light which has passed through the proton-exchanged layers and the grooves is out of phase with respect to ordinary light which has passed through a region of the crystal outside the proton-exchanged layers and the grooves by a quantity of (2n+1).pi., where n denotes an arbitrary integer. Extraordinary light which has passed through the proton-exchanged layers and the grooves is out of phase with respect to extraordinary light which has passed through a region of the crystal outside the proton-exchanged layers and the grooves by a quantity of 2 m.pi., where m denotes an arbitrary integer.

REFERENCES:
patent: 4778234 (1988-10-01), Papuchon et al.
patent: 4991937 (1991-02-01), Urino
patent: 5024726 (1991-06-01), Fujiwara
patent: 5029988 (1991-07-01), Urino
patent: 5245471 (1993-09-01), Iwatsuka et al.

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