Optical phase-only spatial filter

Details Optical phase-only spatial filter Optical phase-only spatial filter

1991-01-28

1992-08-25

Gonzalez, Frank

Optical: systems and elements

Diffraction

Using fourier transform spatial filtering

G02B 2746

Patent

active

051424134

ABSTRACT:
An optical, phase-only spatial filter for filtering spatial frequencies from the output of an optical imaging system is described which comprises an optical element comprised of a pattern of transparent (or reflective, in the case of a mirror) segments, each of which produces an optical path length generally different from that of other segments, and the design of which and the pattern they form dictated by the desired system optical transfer function.

REFERENCES:
patent: 3681519 (1972-08-01), Larsen et al.
patent: 3756695 (1973-09-01), Mino et al.
patent: 3768888 (1973-10-01), Nishino et al.
patent: 3821795 (1974-06-01), Okano
patent: 3911479 (1975-10-01), Sakurai
patent: 4786149 (1988-11-01), Hoenig et al.
patent: 4795236 (1989-01-01), Ise
patent: 4913524 (1990-04-01), Kreuzer

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