Diffractive optical element

Details Diffractive optical element Diffractive optical element

1996-08-29

2000-12-05

Chang, Audrey

Optical: systems and elements

Diffraction

From grating

359565, 359566, 359574, 359576, G02B 518, G02B 2724

Patent

active

061574880

ABSTRACT:
A diffractive optical element including a stack of first, second and third optical regions or a stack of first, second, third and fourth optical regions, a first relief pattern formed between the first and second optical regions, and a second relief pattern formed between the second and third or between the third and fourth optical regions. The first and second relief patterns have substantially identical pitch distributions and are substantially aligned in a direction of an optical axis. Depths of the first and second relief patterns are set such that a wavelength dependency of diffraction efficiency can be decreased over a wavelength range to be used. It is possible to manufacture in a simple manner at a low cost a diffractive optical element in which undesired flares and ghosts are suppressed.

REFERENCES:
patent: 4426130 (1984-01-01), Knop
patent: 4729640 (1988-03-01), Sakata
patent: 5048925 (1991-09-01), Gerritsen et al.
patent: 5175647 (1992-12-01), Us
Gary J. Swanson, "Binary Optics Technology; The Theory and Design of Multi-Level Diffractive Optical Elements," Technical Report 854, MIT Lincoln Laboratory, Aug. 1989.

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