LASER PROTECTION WINDOW USING HOLOGRAPHIC OPTICAL ELEMENT AND CHANNEL PLATES

Abstract

The present invention is a laser protection window for protection from uncontrolled laser illumination. This laser protection window includes a holographic optical element forming a reflection hologram at the wavelength of the expected laser threat. A set of channel plates opaque to the expected laser threat wavelength are disposed at right angles to the holographic optical element in order to block laser illumination arriving outside the cone of protection of the holographic optical element. These channel plates may be vertically disposed to provide protection against mostly horizontally disposed laser threats. In alternative embodiments, the channel plates include both horizontally and vertically disposed plates or plates disposed in polygonal cross section to cover the entire area of the laser protection window. The ratio of the height to the regular distance between channel plates is selected to block incoming radiation having an angle of incidence outside the cone of protection provided by the holographic optical element. The channel plates may be opaque to all light or be formed of holographic optical elements opaque to the wavelength of the expected laser threat.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1BYUNG J. CHANG

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