Optical: systems and elements – Diffraction – From zone plate
Patent
1992-12-22
1994-02-08
Lerner, Martin
Optical: systems and elements
Diffraction
From zone plate
359570, 359572, 359574, G02B 518, G02B 2744
Patent
active
052853144
ABSTRACT:
A diffractive mirror has a plurality of diffractive zones at least one of which has an optical step having a height equal to j.lambda./2 and at least one of which has an optical step having a height equal to k.lambda./2 where .lambda. is a design wavelength of the mirror 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 image point between two light rays emerging from a point source at the object 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 image point between two light rays emerging from a point source at the object point and striking the lens immediately on opposite sides of that step.
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A. Walsh, "Echelette Zone Plates for Use in Far Infrared Spectroscopy," Journal of the Optical Society of America, Mar. 1952, p. 213.
Buckingham Stephen W.
Griswold Gary L.
Kirn Walter N.
Lerner Martin
Minnesota Mining and Manufacturing Company
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