Device for calculating diffraction efficiencies of a...

Details Device for calculating diffraction efficiencies of a... Device for calculating diffraction efficiencies of a...

2006-05-16

2006-05-16

Smith, Zandra V. (Department: 2877)

Optics: measuring and testing

Lens or reflective image former testing

C359S569000

Reexamination Certificate

active

07046350

ABSTRACT:
A device for calculating diffraction efficiencies of a diffraction lens divided into a plurality of regions, each region comprising at least one grating ring, comprises a first memory for storing information about diffraction efficiencies of the regions; a second memory for storing information about weights corresponding to the regions; and a first processor for retrieving information from the first and the second memory, and calculating diffraction efficiencies of the entire diffraction lens using the formulaEj=∑m=1M⁢Wm⁢ηmj(1)wherein:j: integer indicating the order of diffraction lightEj: diffraction efficiency for j-th order diffraction light of the diffraction lensM: positive integer (M>1) indicating the number of regions for which the diffraction efficiency is calculatedm: index of the region for which the diffraction efficiency is calculatedηmj: diffraction efficiency for the j-th order diffraction light of the m-th region (stored in the first memory)Wm: weight for the m-th region (stored in the second memory means).Thus, the diffraction efficiency of the diffraction lens can be calculated easily.

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