Abstract: A rotatable aperture is positioned between the pre-polygon cross-scan cylindrical optical element and the rotating polygon mirror of a laser diode flying spot raster scanner optical system. Rotating the aperture about a line parallel to the axis in the scan plane adjusts the cross-scan resolution of the imaged spot size along the scan line of the raster output scanner optical system.

Abstract: A pulsed imaging Raster Output Scanner utilizes pulse width modulation in conjunction with asymmetric spatial filtering to prevent overshoot of the intensity and maintain precise intensity levels into the other exposure levels.

Abstract: A first binary diffractive optical element has a multi-level surface relief phase grating structure on a substrate. The first binary diffractive optical element can be divided into regions commensurate with resolution requirements of the intended optical application and the diffraction efficiency of each region of the binary diffractive optical element measured. The lowest measured diffraction efficiency for a region of the first binary diffractive optical element will be taken as the reference efficiency. The diffraction efficiencies for all the regions of the binary diffractive optical element will be reduced region by region to the common value of the lowest measured diffraction efficiency by introducing compensating diffractive losses to the regions by a second, corrector binary diffractive optical element which has a binary surface relief phase grating structure on a substrate.

Abstract: A first binary diffractive optical element has a multi-level surface relief phase grating structure on a substrate. The first binary diffractive optical element can be divided into regions commensurate with resolution requirements of the intended optical application and the diffraction efficiency of each region of the binary diffractive optical element measured. The lowest measured diffraction efficiency for a region of the first binary diffractive optical element will be taken as the reference efficiency. The diffraction efficiencies for all the regions of the binary diffractive optical element will be reduced region by region to the common value of the lowest measured diffraction efficiency by introducing compensating diffractive losses to the regions by a second, corrector binary diffractive optical element which has a binary surface relief phase grating structure on a substrate.

Abstract: A wobble correction and focusing optical element for a raster optical scanner combines a toric lens, which provides most of the optical power for focusing the light beam to a scan line, with a binary diffractive optical surface, which corrects the field curvature of the toric lens and which also linearizes the scan. The diffractive surface will have a multi-level structure (binary diffractive optical surface) which possesses a diffractive phase function that will flatten the field curvature of the toric lens.

Abstract: A scan angle doubling system using a rotating cylindrical drum with reflective binary diffractive optical element facets, a cylindrical mirror, and a lens to increase the scanning angle available from a rotating mirror polygon of a given size. The properties of the passive components are such that the output light beam from the reflective binary diffractive optical element facets of the rotating cylindrical drum is collimated and normal to the rotating cylindrical drum. The cylindrical drum, cylindrical mirror, and lens are arranged such that the rotating cylindrical drum and the cylindrical mirror are opposed to each other and separated by a distance greater than the sum of the radius of curvature of the cylindrical mirror plus the focal length of the lens, and the lens is interposed between the rotating cylindrical drum and the cylindrical mirror so that the center of the radius of curvature of the cylindrical mirror and the focal point of the lens means are coincident.

Abstract: An optical scanning system uses a stationary binary diffractive optical element and a rotating binary diffractive element to focus and scan a beam along the scan line.

Abstract: A single pass color xerographic printing system with a single polygon, single optical system Raster Output Scanning (ROS) system has a dual wavelength laser diode source for the ROS which images the dual beams at a single station as closely spaced spots on a dual layer photoreceptor with each photoreceptor layer sensitive to or accessible by only one of the two wavelengths.

Abstract: In situ removal of selected or patterned portions of quantum well layers is accomplished by photo induced evaporation enhancement to form quantum wire, patterned quantum wire and multiple quantum wires in a semiconductor structure.

Abstract: The technique of induced evaporation enhancement is used in MOCVD to accomplish geometrical variations via atomic level removal or thinning or negative growth techniques in situ during or after epitaxial growth thereby varying optical and electrical properties of fabricated semiconductor structures during growth. Among the structures capable of being fabricated are three dimensional buried heterostructures, transparent window lasers, multiple wavelength array lasers, index guided and antiguided mechanisms and transparent optical waveguide structures for optical signal coupling in integrated circuitry.

Abstract: A binary diffractive optical element provides uniform intensity for the scanning beam of a raster output scanning (ROS) optical system by diffracting the excess intensity of the beam.

Abstract: A single pass color xerographic printing system with a single polygon, single optical system Raster Output Scanning (ROS) system has a multiple wavelength laser diode source for the ROS which images the multiple beams at a single station as closely spaced spots on a multiple layer photoreceptor with each photoreceptor layer sensitive to or accessible to only one of the multiple wavelengths.

Abstract: A four color toner single pass color printing system consists generally of a raster output scanner (ROS) optical system and a quad-level xerographic unit which will deposit blue, yellow or black toner and a tri-level xerographic unit which will deposit magenta or cyan toner. The yellow toner is transmissive to the red or infrared light from the raster output scanner (ROS) optical system to allow ease of exposure of the underlying photoreceptor. The resulting color printing system would be able to produce pixels of black and white and all six primary colors.

Abstract: In situ removal of selected or patterned portions of quantum well layers is accomplished by photo induced evaporation enhancement to form quantum wire, patterned quantum wire and multiple quantum wires in a semiconductor structure.

Abstract: A full color xerographic printing system, either double pass or single pass, with a single polygon, single optical system Raster Output Scanning (ROS) system has a dual wavelength laser diode source for the ROS which images the dual beams at a single station as closely spaced spots or at two stations as closely spaced spots on a dual layer photoreceptor with each photoreceptor layer sensitive to or accessible by only one of the two wavelengths.

Abstract: A high density surface emitting semiconductor LED or laser array is coupled with a driver circuit substrate for modulating the light emitted from the array. This modulated light is imaged by optical means onto a photosensitive recording medium of an opto-electronic line printer. The imaging optical means can be either a single or multiple lens system.

Abstract: An optical synchronization system uses a rotating disc with alternating binary diffractive optical elements for a synchronization signal for a pixel clock.

Abstract: Passive waveguides within a monolithic semiconductor structure are coupled to angled facets to reduce the reflectivity of the angled facets and thereby increase the gain available from for the amplification waveguides coupled to the passive waveguides.

Abstract: A high density surface emitting semiconductor LED array comprises disordered regions extending through a second contact layer, second confinement layer, an active layer and partially extending through a first confinement layer to define light emitting areas therebetween the disordered regions. Individual contacts on the second contact layer aligned with each emitting area inject current through the layers to a common contact on a first contact layer causing emission of light from the active layer through the surface of the exposed first contact layer. The second confinement layer can be replaced with a DBR to form an enhanced LED array. Both confinement layers can be replaced with DBRs to form a laser array. A refractive semiconductor layer, fresnel lenses or a micro lens array can be used to optically modify the surface emitted light. The semiconductor laser/light emitting diode arrays are fabricated without a substrate.

Abstract: A variable attenuator for electronically controlling dual beam intensity comprising a laser source for emitting a light beam, a twisted nematic liquid crystal for exposure control of the light beam, a double-sided multi-layer dielectric thin film coated polarization plate for decreasing the s-component of the light beam to less than or equal to 0.0001 of the light beam emitted from the laser source, and a beam splitting crystal for separating said light beam into two beams of equal intensity.