Optical element for correcting non-uniform diffraction efficienc

Details Optical element for correcting non-uniform diffraction efficienc Optical element for correcting non-uniform diffraction efficienc

1994-12-27

1996-03-05

Loney, Donald J.

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Including variation in thickness

428913, 359569, 359573, 359576, B32B 300, G02B 518

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active

054966167

ABSTRACT:
A first binary diffractive optical element has a multi-level surface relief phase grating structure on a substrate. The first binary diffractive optical element can be divided into regions commensurate with resolution requirements of the intended optical application and the diffraction efficiency of each region of the binary diffractive optical element measured. The lowest measured diffraction efficiency for a region of the first binary diffractive optical element will be taken as the reference efficiency. The diffraction efficiencies for all the regions of the binary diffractive optical element will be reduced region by region to the common value of the lowest measured diffraction efficiency by introducing compensating diffractive losses to the regions by a second, corrector binary diffractive optical element which has a binary surface relief phase grating structure on a substrate. By closely spacing the two binary diffractive optical elements in the optical path of an incident light beam, the resulting diffracted beam will have a uniform diffraction efficiency.

REFERENCES:
patent: 4895790 (1990-01-01), Swanson et al.
patent: 5208701 (1993-05-01), Maeda
patent: 5214535 (1993-05-01), Harris
W. Veldkamp & T. McHugh, "Binary Optics", Scientific American, vol. 266, No. 5, May 1992, pp. 92-97.
G. J. Swanson, "Binary Optics Technology: The Theory and Design of Multi-Level Diffractive Optical Elements", Lincoln Laboratory, Massachusetts Institute of Technology, Technical Report 854, 14 Aug. 1989.

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