Abstract: Localized epitaxial growth of GaAs from a silicon monocrystalline substrate to provide a three-dimensional Si-GaAs structure and method. The silicon has an insulating layer deposited thereover and a window is opened through the layer to expose a small area of the underlying silicon from which silicon is epitaxially grown until the window is nearly full whereupon a thin buffer layer such as germanium is epitaxially grown over the epi-silicon to fill the window. Al.sub.x Ga.sub.1-x As (where x.gtoreq.0) is then locally epitaxially grown from the buffer layer and it grows laterally as well as vertically to cover the surrounding insulating layer surface and provide a site for high frequency electronics.

Abstract: A method of modulation doping GaAs, (Al,Ga)As and related compounds with silicon ions during molecular beam epitaxy (MBE) growth.

Abstract: A non-volatile flat film memory with a symmetrical cell design having four magnetic films and full turn word line construction. The design provides flux closure during both store and read as well as providing memory storage in all films. The structure is fabricated on silicon using processes compatible with integrated circuit technology.

Abstract: Integration of optoelectronic component and electronic components in a planar surface of a semi-insulating substrate such as gallium arsenide. A depression is etched into the planar surface to contain the transverse junction stripe laser structure which is grown by epitaxial layers. In the resulting structure the surface of the epitaxial layers forms a portion of the planar surface, thus placing the electrical and optical elements on or at the planar surface to facilitate fabrication and testing.

Abstract: A thin-layer electrochemical cell for rapid detection of toxic chemicals and chemical agents having a large area thin-film sensing electrode in contact with a very thin layer of nonaqueous aprotic organic based electrolyte solution, and having the reference electrode on the same plane and the counter electrode positioned in a different plane beyond the edge of the large area sensing electrode.

Abstract: An improved detector for combustible gases and which is able to discriminate between natural gas (methane and ethane) and other sources of methane (e.g. swamp gas, petrochemical and automotive) or other combustible gases by measuring the characteristic methane/ethane ratio of natural gas, based on infrared absorption of methane and ethane, in combination with another non-specific combustible gas detector.

Abstract: A non-electrical thermo-mechanical control system for a hot water heating system having a modulating burner in the boiler. The thermo-mechanical control system simultaneously controls fuel and air supply to the burner in dependence on the temperature difference between forward water temperature to the radiators and return water temperature from the radiators.

Abstract: A limitation in the use of ceramic substrates for electronic packaging is that photolithographic processes applied to such substrate surfaces do not give the highest resolution that the process is capable of because of inherent surface topographical variations on the ceramic substrate. A smoothing layer of a dry film glazed photosensitive material, such as RISTON solder mask, is laminated over the substrate surface, exposed with UV and cured. Metal conductor lines are then bonded onto the surface of the solder mask layer.

Abstract: A cadmium telluride boule encapsulated with an encapsulant material consisting of about 80% by volume of powdered beta-phase calcium sulfate hemihydrate, about 20% by volume of powdered alpha-phase calcium sulfate hemihydrate and water. This specially encapsulated boule can then be sawn with a multiblade wafering apparatus used to simultaneously saw the boule into multiple substrate wafers.

Abstract: An intravascular catheter tip fiber optic pressure sensor wherein a lens element at the end of the fiber optic collimates the light emanating from the fiber and directs the light in a column towards a closely spaced reflecting diaphragm. The diaphragm is pressure responsive and modulates the focal length of the lens-diaphragm-mirror combination. Three optic fibers traverse the length of the hollow catheter tube, one carrying transmitted light to the tip, one carrying the reflected light from the diaphragm (i.e. the signal), and the third fiber carrying a reflected reference light. The reference detector provides a signal level to control the level of intensity of the light source.

Abstract: A phase modulated DC-to-AC or a DC-to-DC power converter utilizes input terminals connected to a source of power and output terminals connected to a suitable load. The transfer of power between the power source and the load or from the load back to the power source is accomplished by electronic switching that is phase displaced controlled in all four quadrants.

Abstract: This invention provides a simple and easily manufacturable lens apparatus, a space variant phase shifter, which is one of the key components in an optical ambiguity function generator. The improved lens apparatus is a combination of conventional optics comprising a cylindrical lens and a spherical lens in which the spherical lens is of opposite sign than the cylindrical lens and of one half the power.

Abstract: An optical time integrating correlator is fabricated in integrated optical form. This integrated optical implementation comprises a number of integrated components including an optical waveguide on a substrate, a diode laser, a guided wave lens, an electro-optic beamsplitter, a pair of surface acoustic wave transducer for generating first and second counterpropagating surface acoustic waves, a spatial filter and a detector array.

Abstract: In the field of fiber optic acoustic sensors, a method for acoustic desensitization of certain sections of optic fibers by means of the use of higher elastic modulus coatings, such as an electrodeposited nickel jacket.

Abstract: The disclosure is directed to the self-aligned coupling of the core of an optical fiber to the narrow stripe emitting spot in the active layer of a narrow stripe semiconductor laser. In this invention a V-groove is etched into the same substrate onto which the epitaxial layers for the narrow stripe laser have been grown.

Abstract: A radiation-hard, non-volatile, thin film planar RAM structure fabricated by silicon integrated circuit processing. This memory cell construction provides a magnetoresistive readout. A magnetoresistive film sensor is positioned in the gap of a thicker flux concentrator film. A memory film and the flux concentrator film comprise a magnetic path to the MR film.

Abstract: This invention provides a simple and easily manufacturable lens apparatus, a space variant phase shifter, which is one of the key components in an optical ambiguity function generator. The improved lens apparatus is a combination of conventional optics comprising a cylindrical lens and a spherical lens in which the spherical lens is of opposite sign than the cylindrical lens and of one half the power.

Abstract: A stress-free optic element or window for use in equipment such as lasers. In this window a plurality of circular or curved grooves are formed in the window surface to prevent stresses from reaching the central region of the window used for light beam transmission. The plurality of grooves effectively form a resilient or spring like zone between the periphery of the window and the central region so that stresses generated in the peripheral mounting area are isolated from reaching the central stress-free area.

Abstract: A solid state AlGaAs laser of the transverse junction stripe with distributed Bragg reflector type.

Abstract: A system for using optical data processing means to create the ambiguity function for two signals is disclosed. One-dimensional spatial light modulators are employed to code the signals into a beam of substantially coherent light. After the light has been coded with the first one-dimensional signal a Fourier Transform is performed by lens means. A linear phase shifter is placed in the Fourier Transform plane. This has the effect of creating a linear dependence along a second dimension when a second Fourier Transform is performed.