Diffractive lens

Details Diffractive lens Diffractive lens

1989-08-08

1990-06-26

Arnold, Bruce Y.

35016216, 35016217, 35016224, 350432, G02B 308, G02B 1318

Patent

active

049366661

ABSTRACT:
A diffractive lens has a plurality of diffractive zones at least one of which has an optical step having an optical height equal to j.lambda. and at least one of which has an optical step having an optical height equal to k.lambda. where .lambda. is a design wavelength of the lens and j and k are unequal nonzero integers. Alternatively stated at least one of the optical steps induces a relative phase shift of 2j.pi. at the back conjugate point between two light rays emerging from a point source at the front conjugate point and striking the lens immediately on opposite sides of the step and at least one of the steps induces a relative phase shift of 2k.pi. at the back conjugate point between two light rays emerging from a point source at the front conjugate point and striking the lens immediately on opposite sides of that step.

REFERENCES:
patent: 3390399 (1968-06-01), Leonard
patent: 4787722 (1989-11-01), Claytor
d'Auria et al, "Photolithographic Fabrication of Thin Film Lenses", Optics Communications, vol. 5, No. 4, pp. 232-235.

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