U.S.Government as represented by the Secretary of the Army Patent applications |
Patent application number | Title | Published |
20110202323 | PHOTODETECTORS USING RESONANCE AND METHOD OF MAKING - An infrared photodetector comprising a thin contact layer substantially transparent to infrared light; an absorption layer positioned such that light admitted through the substantially transparent thin contact area passes through the absorption layer; the absorption layer being configured to utilize resonance to increase absorption efficiency; at least one reflective side wall adjacent to the absorption layer; the at least one reflective side wall being substantially non-parallel to the incident light; the at least one sidewall operating to reflect light into the absorption layer for absorption of infrared radiation; a top contact layer positioned adjacent to the active layer. A method for determining the efficiency of a photodetector configuration using a three-dimensional finite element electromagnetic computer simulation comprising: determining a design configuration geometry, calculating the electromagnetic field distributions, determining a quantum efficiency spectrum at the desired wavelength or wavelength range; whereby to determine the optical effectiveness, a 3-dimensional finite element electromagnetic simulation is carried out to calculate the quantum efficiency of the detector configuration geometry. | 08-18-2011 |
20100321756 | Large Aperture Polymer Electro-Optic Shutter Device and Method of Manufacturing Same - A large-aperture direct-view high-speed electro-optic shutter includes an electro-optic polymer material constructed to form a Pockels cell and an integrated photoconducting semiconductor switch. A chromophore-doped polymer material or chromophore copolymer, wherein the chromophore is oriented within the polymer material, exhibits a linear electro-optic effect when an electric field is applied to the device. In one embodiment, the polymer host material comprises one or more of a polycarbonate, amorphous polycarbonate, or polymethylmethacrylate polymer hosts. The optically active chromophore comprising one or more coumarin and coumarin derivatives, stilbene or tolane derivatives is incorporated within the polymer host, forming a guest-host polymer. In another embodiment, the chromophore is chemically bonded to the monomer that forms the polymer, resulting in an optically active copolymer. The electro-optic shutter device is then activated by incident light through the photoconducting semiconductor switch, rendering the Pockels cell to have an optical density of at least 3.0. | 12-23-2010 |
20100020832 | WAVELENGTH SELECTABLE LASER SYSTEMS AND RELATED METHODS - Laser systems and related methods are provided. In this regard, a representative laser system includes: a laser diode array that generates light; a first crystal having a cavity; an optical element operative to focus the generated light onto the first crystal such that the light generates a high-power circulating beam within the cavity; a second crystal positioned with respect to the first crystal such that the frequency of the high-power circulating beam is doubled; and a first coating applied to the first crystal and second coating applied to the second crystal, the first coating and the second coating being operative to cause at least a portion of the beam to be emitted within a particular wavelength range of the generated light. | 01-28-2010 |