This patent discloses a diffractive radiation shield for protecting eyes and radiation sensitive devices from laser radiation. The shield utilizes one or more holograms disposed on transparent substrates. These holograms consist of spherical holographic fringes recorded in a dischromated gel with which the substrates are coated. The holographic fringe reflect laser radiation which is normal to their respective surfaces. Reflectivity is maximized for a particular wavelength by proper selection of ...
A design for a narrow-band diffractive radiation shield to be fabricated on a helmet visor has been developed and tested. An experimental feasibility study indicates that 99.9% shielding of a specified laser wavelength may be achieved with a visor positioned on the order of 7 cm from the eye (Photopic transmittance is expected to exceed 90%.) Several technical obstacles remain to be overcome before a full-scale workable prototype can be ...
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