Laser protection window with tilted modulated index of refractio

Details Laser protection window with tilted modulated index of refractio Laser protection window with tilted modulated index of refractio

1988-10-06

1993-01-12

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 24, 359589, G02B 532, G02B 528

Patent

active

051796309

ABSTRACT:
The present invention is a technique for construction of a laser protection window providing broadened angular protection. Plural modulated index of refraction filter elements are constructed to reflect incident light at a predetermined laser threat wavelength over a cone of protection. The plurality of modulated index of refraction filter elements are disposed in tandem at angles to a direction of primary view through the laser protection window which are symmetrical with respect to the direction of primary view. In a first embodiment, a first optional modulated index of refraction filter element is disposed perpendicular to the direction of primary view; the other modulated index of refraction filter elements are disposed in pairs at opposing angles to the direction of primary view. In an alternative embodiment, the angled modulated index of refraction filter element plates are formed of angled segments. The plural modulated index of refraction filter elements may be angled in two planes to provide extended angular coverage both horizontally and vertically.

REFERENCES:
patent: 4601533 (1986-07-01), Moss
patent: 4637678 (1987-01-01), Moss et al.
patent: 4702548 (1987-10-01), Tanaka et al.
patent: 4747673 (1988-05-01), Marrs et al.
patent: 4778263 (1988-10-01), Foltyn
patent: 4830441 (1989-05-01), Chang

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