Multi-layer holographic notch filter

Details Multi-layer holographic notch filter Multi-layer holographic notch filter

1990-04-18

1992-04-07

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 19, 359 15, 359 24, 351 44, G02B 532

Patent

active

051033232

ABSTRACT:
A holographic member for a helmet visor comprising a first holographic layer having planes of diffraction oriented in a first direction in a given local area is disclosed. A second holographic layer disposed over said first holographic layer has planes of diffraction oriented in said local area in the opposite direction. The first holographic layer is transferred from a slanted planar holographic mirror. The second holographic layer comprises the holographic analog of an oppositely slanted transferred planar mirror. The slant and the opposite slant have substantially the same magnitude of slant but opposite orientation, providing for diffractive ghost compensation. A third holographic layer, unslanted, is transferred from an unslanted planar holographic mirror. The three holographic layers provide practical total eye coverage with minimum diffractive unwanted ghosts.

REFERENCES:
patent: 4601533 (1986-07-01), Moss
patent: 4637678 (1987-01-01), Moss et al.
patent: 4786125 (1988-11-01), Magarinos et al.
patent: 4802719 (1989-02-01), Magarinos et al.
patent: 4830441 (1989-05-01), Chang
patent: 4978182 (1990-12-01), Tedesco

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