Relief type diffraction optical element, optical system...

Details Relief type diffraction optical element, optical system... Relief type diffraction optical element, optical system...

2005-01-04

2005-01-04

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S575000, C359S569000

Reexamination Certificate

active

06839174

ABSTRACT:
A relief type diffraction optical element including a substrate made of an optical material, said substrate having formed on its surface a non-even width relief pattern which include a first zone group consisting of at least one zone whose cross sectional configuration is formed by a curvilinear portion which follows a phase shift function or at least two rectilinear portions which approximates the phase shift function, and a second zone group consisting of a plurality of zones each having a single rectilinear portion approximating the phase shift function.

REFERENCES:
patent: 5260828 (1993-11-01), Londono et al.
patent: 5627679 (1997-05-01), Iba
patent: 5682266 (1997-10-01), Meyers
patent: 5801889 (1998-09-01), Meyers et al.

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