Diffractive optical element and optical low-pass filter...

Details Diffractive optical element and optical low-pass filter... Diffractive optical element and optical low-pass filter...

2005-06-16

2009-08-25

Chang, Audrey Y (Department: 2872)

Optical: systems and elements

Diffraction

From zone plate

C359S566000, C359S569000, C430S005000

Reexamination Certificate

active

07580187

ABSTRACT:
The invention provides a diffractive optical element that can be used as a light beam splitter device, an optical low-pass filter or the like having a two-dimensionally multi-valued fine periodic structure. The surface of a transparent substrate for the diffractive optical element is divided into fine rectangular areas of identical shape which line up in two orthogonal directions while a plurality of rows line up with ends in alignment in any one of the directions. With respect to standard wavelength light incident vertically on the surface of the transparent substrate, an l-th, and a (l+1)-th rectangular area in an l-th row, where l is an odd number, gives a phase 2pπ, and a phase {(4q+1)π/2+δπ/2}, respectively, and an l-th, and a (l+1)-th rectangular area in a (l+1)-th row gives a phase {(4r+3)π/2+3δπ/2}, and a phase {(4s+2)π/2+δπ}, respectively. However, −0.25≦δ≦0.25, and p, q, r, and s is an integer.

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