Abstract: An electrophotographic recording apparatus and method wherein an electrophotographic recording medium is continuously moved in a first direction relative to a row of light-emitting recording elements such as LEDs. A beam shifter assembly is located within an optical path between the LEDs and the recording medium. The beam shifter assembly is operable in a first mode to pass light from the LEDs without substantial lateral shifting and in a second mode to pass light with substantial shifting of said light in a lateral direction having a directional component parallel to the row of LEDs. A control is provided for controlling the beam shifter assembly in different modes on alternate recording time lines of exposure. This helps minimize in-track artifacts. The apparatus is also operable in a multiaddress mode that is automatically instituted when a higher resolution image scanner is used or when a higher resolution character font library is input for recording.

Abstract: A multilayer structure has an a nonlinear optical film epitaxially grown on an underlying buffer layer of substantially lower refractive index. The buffer layer itself is epitaxially grown on a single crystal substrate with an intermediate epitaxial electrode.

Abstract: An optical frequency converter and method of making same is disclosed. The converter includes a nonlinear optical support having a homogeneous periodically domain reversed portion and an optical waveguide which traverses the surface of the support. At least a segment of the waveguide intersects the homogeneous periodically domain reversed portion of the support to achieve a quasi phase-matched nonlinear optical frequency conversion interaction. The domain reversed portion is selected to be compositionally indistinguishable from the remainder of the waveguide.

Abstract: A multiwavelength upconversion waveguide laser producing visible or ultraviolet wavelength radiation comprising a semiconductor laser diode producing relatively long wavelength radiation, a channel waveguide having a thin film material which converts the relatively long wavelength radiation into visible or ultraviolet wavelength radiation, and a optical resonator which recirculates the visible or ultraviolet wavelength radiation. The optical resonator may use an output optical coating or one or more Bragg grating reflectors as an output coupler. One or more optical resonators may be used to produce one or more visible or ultraviolet radiation wavelengths. One or more independently controllable lightwave modulators are used to modulate the visible or ultraviolet wavelength radiation.

Abstract: A photographic camera system is disclosed in which LEDs are used to record different gray levels or colored information on the film and an optical image of a subject is also recorded on the film.

Abstract: A multilayer waveguide having an optical film of LiN.sub.b Ta.sub.1-x O.sub.3 formed on the surface of a buffer layer or substrate of material having a nearly identical lattice structure and substantially low refractive index.

Abstract: A method for preparing a ceramic article comprising compacting a particulate including a primary oxide and a secondary oxide to form a blank. The primary oxide is ZrO.sub.2. The secondary oxide is selected from the group consisting of MgO, CaO, Y.sub.2 O.sub.3, Sc.sub.2 O.sub.3, rare earth oxides and combinations thereof. The blank is sintered in contact with oxide selected from the group consisting of MgO, CaO, Y.sub.2 O.sub.3, Sc.sub.2 O.sub.3 and rare earth oxides. The zirconia alloy ceramic articles produced have a cubic phase case and a tetragonal phase core.

Abstract: A multilayer structure comprising in order: a (111)-oriented single crystal substrate and an epitaxial metal oxide buffer layer. The substrate is doped or undoped. The substrate is a semiconductor selected from the group consisting of Si compounds, Ge compounds, and compounds having at least one element selected from the group consisting of Al, Ga, and In and at least one element selected from the group consisting of N, P, As, and Sb. The substrate defines a substrate superlattice dimension equal to 3 times a sublattice constant of the substrate. The epitaxial metal oxide buffer layer has a three-fold rotation symmetry about the substrate (111) direction. The buffer layer defines a buffer layer superlattice dimension equal to 4 times the oxygen-to-oxygen lattice spacing of the buffer layer. The buffer layer superlattice dimension is within 15 percent of the substrate superlattice dimension.

Abstract: A scanning device having: (i) an electrooptic planar waveguide or bulk material capable of propagating light beams with minimum beam distortion, (ii) an electrooptic prism array defined on said electrooptic planar waveguide or bulk material, comprised of at least one pair of antiparallel-poled ferroelectric domain regions and, (iii) control means to apply a spatially uniform electric field throughout said electrooptic prism array using a pair of electrically-addressable continuous electrodes, so as to induce an electrically-controlled deflection to a light beam propagating through the device.

Abstract: An optical, waveguide, quasi-phase-matching frequency converter has integral means to vary the efficiency of the quasi-phase-matching frequency conversion process resulting in intensity modulation of the device output; said frequency converter has integral means to optimize the quasi-phase-matching frequency conversion process resulting in optimum device output; and said frequency converter has integral input signal polarization mode conversion means in optional combination with the conversion optimization means for modulating the optimized device output. Methods for modulating and optimizing the quasi-phase-matching frequency converted signal by electro-optically controlling the dispersion of the frequency converting medium are also disclosed.

Abstract: A frequency converter/mixer has a crystalline substrate which supports an inorganic, crystalline, nonlinear optical thin film having a higher index of refraction than the substrate, to form an optical waveguide. Input radiation of frequency .omega..sub.1 which enters the waveguide propagates through the waveguide and exits as radiation having a different frequency .omega..sub.2. The frequency conversion of the input radiation is accomplished by first-order quasi-phase-matching the input and output signals as a result of the periodicity of the sign-alternating nonlinear dielectric susceptibility coefficient of the optical thin film over an active region of the waveguide. A method of first-order quasi-phase-matching is also disclosed.

Abstract: A method for preparing a ceramic article comprising compacting a particulate including a primary oxide and a secondary oxide to form a blank. The primary oxide is ZRO.sub.2 and the secondary oxide is MgO, CaO, Y.sub.2 O.sub.3, Sc.sub.2 O.sub.3, rare earth oxides or a combination thereof. The blank is sintered in contact with MgO, CaO, Y.sub.2 O.sub.3, Sc.sub.2 O.sub.3, rare earth oxides or a combination thereof. The zirconia alloy ceramic articles produced have a cubic phase case and a tetragonal phase core.

Abstract: A process of forming on a substrate a coating of a precursor of a crystalline rear earth alkaline earth copper oxide or heavy pnictide mixed alkaline earth copper oxide electrical conductor and converting the precursor to the crystalline electrical conductor.

Abstract: A conductive film of crystalline bismuth mixed alkaline earth oxide containing silver is disclosed. A process for promoting the growth of crystalline bismuth mixed alkaline earth oxide grains by incorporating silver prior to sintering is also disclosed.

Abstract: A process of forming on a substrate a coating of a precursor of a crystalline rare earth alkaline earth copper oxide or heavy pnictide mixed alkaline earth copper oxide electrical conductor and converting the precursor to the crystalline electrical conductor.

Abstract: A process is disclosed of promoting the growth of crystalline bismuth mixed alkaline earth copper oxide grains in forming a conductive film by incorporating silver in the bismuth mixed alkaline earth copper oxide prior to sintering.

Abstract: Articles are disclosed in which an electrically conductive layer on a substrate exhibits a superconducting transition temperature in excess of 30.degree. K. Conductive layers are disclosed comprised of a crystalline rare earth alkaline earth copper oxide. Processes of preparing these articles are disclosed in which a mixed metal oxide precursor composition is coated and heated to its thermal decomposition temperature to create an amorphous mixed metal oxide layer. The amorphous layer is then heated to its crystallization temperature.

Abstract: The invention generally is accomplished by a casting of a liquid metallo-organic ceramic precursor solution to form a layer on a substrate. This layer is then heated to a low temperature to create an amorphous layer. Then a selected area is heated to a high temperature by localized heating to create a patterned area of polycrystalline ceramic having electro-optic properties.

Abstract: A circuit element is disclosed comprised of a substrate and an electrically conductive layer located on the substrate. The electrically conductive layer is comprised of a crystalline rare earth alkaline earth copper oxide. The substrate is formed of a material which increases the electrical resistance of the conductive layer when in contact with the rare earth alkaline earth copper oxide during crystallization of the latter to an electrically conductive form. A barrier layer is interposed between the electrically conductive layer and the substrate. The barrier layer contains magnesium, a group IVA metal, or a platinum group metal, either in an elemental state or in the form of an oxide or silicide.

Abstract: A combination is disclosed comprising a superconductive ceramic oxide which degrades in conductivity upon contact of ambient air with its surface and, interposed between said ceramic oxide surface and ambient air, a passivant polymer.