Diffraction gratings having high efficiencies

Details Diffraction gratings having high efficiencies Diffraction gratings having high efficiencies

1989-05-03

1991-04-23

Arnold, Bruce Y.

3501622, G02B 518

Patent

active

050094840

ABSTRACT:
A diffraction grating structure in the form of a substrate having a grating portion at an input surface thereof and a solid portion at an output surface thereof. A plurality of diffracting elements are formed in the grating portion, the diffracting elements having grooves, the depths thereof depending on the wavelength of incoming radiation impinging on the diffraction elements. The diffracting elements are formed at a selected slant angle with reference to a direction orthogonal to the plane of the input surface of the grating portion of the structure. The incoming radiation is redirected through the grating structure in a selected direction so as to be effectively concentrated at a selected spatial region.

REFERENCES:
patent: 3585121 (1971-06-01), Franks et al.
patent: 4746192 (1988-05-01), Minagawa
patent: 4850682 (1989-07-01), Gerritsen
The Bell System Technical Journal 48, 1969.

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