Two-dimensional optical low-pass filter

Details Two-dimensional optical low-pass filter Two-dimensional optical low-pass filter

1993-08-27

1996-04-02

McGraw, Vincent P.

Optical: systems and elements

Diffraction

From grating

359574, G02B 518

Patent

active

055046215

ABSTRACT:
A two-dimensional optical low-pass filter includes an optical phase grating having a plurality of unitary grating periods on only one side of a grating plane. Each of the unitary grating periods includes at least two phase retardation structures spaced from each other, thereby providing phase retardation across the grating plane. The two phase retardation structures invariably have at least one non-continuous phase retardation configuration substantially in all directions on the grating plane.

REFERENCES:
patent: 4083627 (1978-04-01), Okano
patent: 4093346 (1978-06-01), Nishino et al.
patent: 5166826 (1992-11-01), Ruprecht
Xuenong Lu, Ying Wang, Minxian Wu and Guofan Jin, "The Fabrication of a 25.times.25 Multiple Beam Splitter", Optics Communications, vol. 72, No. 3/4, Jul. 15, 1989.
U. Krackhardt and N. Streibl, "Design of Dammann-Gratings for Array Generation", Optics Communications, vol. 74, No 1/2 Dec. 1, 1989.

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