Lightweight Low Cost Universal Laser Eye Protection (LEP) Device for Visors

In this SBIR Phase I proposal, we intend to develop a lightweight low cost and universal Laser Eye Protection (LEP) device for military visors. The technology base is the special liquid crystal photonic crystal. This passive LEP, different from narrow band dielectric coatings and holograms, exhibits a broadband reflection with sharp spectral edges.  It avoids almost all the common problems associated with the dielectric coatings and holograms.  The LEP is made on flexible and self-adhesive plastic sheet such that it can be easily applied to production visors with irregular shape and curvature without being affected by the PC molding procedure.  It is also compatible with the neutral tint (dye) to minimize the internal reflection.  The LEP is also superior to dye based LEPs in terms of visible transmittance, visible color appearance, laser damage threshold, and material stability during the visor molding process. The LEP possesses high optical density (>4) to against laser beam having different incidence of angle till 70o.  It allows luminous transmittance of >85%, and neutral color.   In Phase I, demo LEP will be produced to show the capability. In Phase II working prototype(s) will be developed followed by extensive field-test till all the specifications are met. BENEFIT: The major application of these technologies is for eyewear protection goggle with wide spectral range for the Army warfighters. Specifically, they will be integrated into a head- or helmet-mounted display to prevent operator¡¯s eyes from laser injury. It could be adapted for pilots and soldiers of other military such as Army, NAVY, and Marine.  Due to its superior optical performance, the new technology will penetrate into a vast amount of market currently occupied by protection goggle technologies. The technology(s) can be easily adapted to civil law enforcement personnel with similar applications that desire wide transmission range and fast transmission level change rates. Or it can be used in many other sports and recreational activities where the performance of current products suffer to satisfy.