Abstract: A volume-absorbing laser beam dump encloses a solution comprising a laser-absorbing solute diluted in a solvent that is non-absorbent of the laser energy. The laser beam dump includes a window to admit a laser beam into the solution. As the laser beam travels through the solution, the diluted solute absorbs the laser energy.

Abstract: A method and apparatus for depositing spatially substantially uniform layers of material onto a plurality of substrates positioned upon a rotatable tool within a vacuum chamber. The chamber is generally of the type that includes a sealable volume bounded by six orthogonally-arranged chamber walls. Apparatus is provided within the chamber for generating a flux of the coating material of known spatial character. A mask of predetermined shape is engaged to apparatus, including a linkage and a linear translation stage driven by a programmable stepper motor, for controllably advancing it during deposition with respect to the mounted substrate.

Abstract: The uniformity of individual layers of multiple coating materials deposited on a substrate in a vacuum deposition process (such as for manufacturing mirrors for use in ring laser gyroscopes) is improved by an apparatus and method that include changing the masks placed in front of the substrate upon which the coating materials are to be deposited. Separate masks are tuned for each particular coating material to compensate for the unique plume shape of the material, and provide a uniform deposition of that particular coating material. Each mask is positioned in front of the substrate when the material for which the mask has been tuned is being deposited. The masks are changed when the coating material is changed, without venting the chamber.

Abstract: A mirror for reflecting a selected frequency of light includes a plurality of alternating quarter wavelength thick layers of two dielectric materials that are resistive to physical and chemical changes upon exposure to ultraviolet radiation coated upon a substrate. The materials have different refractive indices. The materials preferably are comprised of a mixture of alumina and tantala as the high refractive index layer and alumina as the low refractive index layer.

Abstract: A coating for an optical component is formed to be antireflective for a selected wavelength and resistive to the transmission of ultraviolet radiation. The coating has first layer is formed of a dielectric material having a refractive index n.sub.1 coated onto the optical component. A second layer is formed of a dielectric layer having a refractive index n.sub.2 that is smaller than the refractive index n.sub.1 of the first layer. The second layer is formed of a material that transmits the selected wavelength while blocking ultraviolet light, thereby protecting the first layer and the optical component from damage due to exposure to ultraviolet radiation. The thicknesses of the layers is selected so that the coating is antireflective for the selected wavelength.

Abstract: Provided is an electrographic printing paper suitable for the printing of a quality image, which printing paper is pastable and is therefore useful in pastable displays, including outdoor billboards. The electrographic printing paper is comprised of a dielectric coating on a conductive base paper which exhibits wet strength and wet expansion properties suitable for pasted displays. The conductive base paper contains a wet strength agent and a sizing or coating of a conductivizing composition comprised of a binder and a substantially water insoluble conductivizing agent.