Abstract: This invention pertains to an improved thermoplastic holographic recording medium having an added layer between the thermoplastic layer and the photoconductor layer. The added layer is electrically insulating at temperatures used for thermal development to prevent decaying charge contrast during hologram development.

Abstract: When electrically insulating ceramic substrates are coated with silicon by any of a number of methods that brings the substrate into contact with molten silicon, electrical contact can only be made conveniently to the exposed surface of the silicon coating. This invention teaches an improvement for making electrical contact to the interface surface of the silicon. It was discovered that by providing narrow slits or small holes in the ceramic substrate that upon coating the substrate with molten silicon, molten slicon will wick through the slits or holes to the uncoated surface of the ceramic.

Abstract: An energy curtain is formed by exciting high order beam modes in an open resonant cavity. Depending on mode number, the energy resonates in a mathematically determined pattern. A detector senses changes in the resonant condition caused by the presence of an object in the pattern. The apparatus may be used in a variety of applications, including the protection of a machine operator from a hazardous area of a machine, parts counting, and intrusion detection.

Abstract: Fine-grained polygonized halide bodies are formed having comparable optical properties to a single crystal halide body. Heat and force are applied to the halide body to reduce the dimension of the body in one direction while the body is constrained in other directions.

Abstract: Optical waveguides are fabricated by heating a region of a body of optical material with an energy beam. The region is locally heated to a temperature at which plastic deformation occurs as a result of the constraints placed by the unheated adjacent material. The plastic strain produced at high temperature translates into a residual stress as the material cools which results in a greater index of refraction within the region than in surrounding regions.

Abstract: It is desirable to coat large area, thin sheets of large-grain polycrystalline silicon on an inexpensive ceramic substrate for use in solar cell applications and the like. Such ceramic substrates as are used are chosen from those having thermal expansion coefficients similar to those of silicon. The ceramics meeting these requirements, for example mullite, alumina and zirconia, when brought into contact with molten silicon, however, are not wet by the silicon and no coating takes place. In this invention the method of coating includes the step of carbonizing the surface of such a substrate and then contacting the carbonized surface of the ceramic with the molten silicon, whereupon a large-grain silicon coating is produced wherever the ceramic is carbonized. In this way the ceramic of the type which is not wet by molten silicon can be successfully coated with silicon.

Abstract: A protective layer is prepared for water soluble optical elements. A process for obtaining clear thallium iodide (TlI) films of 1 to 2 micron thickness on potassium chloride (KCl) substrate. The high index of refraction (2.34 - 2.46 at 10.6 microns) makes this coating material attractive as a component in an antireflection system of coatings.

Abstract: An energy curtain is formed by exciting high order beam modes in an open resonant cavity. Depending on mode number, the energy resonates in a mathematically determined pattern. A detector senses changes in the resonant condition caused by the presence of an object in the pattern. The apparatus may be used in a variety of applications, including the protection of a machine operator from a hazardous area of a machine, parts counting, and intrusion detection.

Abstract: Fine-grained halide bodies are formed which have comparable optical properties to a single crystal halide body. The halide bodies are formed by press forging while an essentially constant fluid pressure is applied to the halide body.

Abstract: An improved fan controller for forced-air temperature conditioning apparatus for buildings, such as for example, forced warm air furnaces in which the fan turn-off is controlled as a function of the difference in temperature between the plenum temperature and the return air temperature.

Abstract: Optical waveguides are fabricated by heating a region of a body of flat filter glass with an energy beam such as a scanning focused laser beam. The region is locally heated to a temperature at which softening occurs. Upon cooling two differing effects occur, the two effects causing a "W" shaped index of refraction profile. The first effect is the photoelastic effect due to the residual stress introduced as the heated material cools and contracts. The residual tensile stress is constant in the softened region, but decreases as the distance from the center of the heating increases. Since the density and therefore the refractive index of this region is inversely proportional to the residual stress, this effect resulted in a local refractive index minimum. The other effect is the material density change in the softened region. As the cooling rate is small in the center and large in the edge of this softened region, a density change occurs with the center attaining the highest value and decrease towards the edge.

Abstract: Ohmic contacts to p-type mercury cadmium telluride are prepared by depositing a Column IB metal on a surface of the p-type mercury cadmium telluride, depositing a buffer material on the Column IB metal, and contacting the buffer material with a bonding material which is capable of alloying with the Column IB metal. The buffer material prevents alloying between the Column IB metal and the bonding material.

Abstract: A thin optical waveguide is formed by a waveguide region having an index of refraction greater than the index of refraction of the substrate. The greater index of refraction of the waveguide region is a result of residual stress within the waveguide region.

Abstract: Fine-grained polygonized halide bodies are formed having comparable optical properties to a single crystal halide body. Heat and force are applied to a single crystal halide to recrystallize or polygonize the halide. The body is then annealed to suppress room temperature grain growth.

Abstract: A threshold magnetic switch is described, with adjustable threshold level for varying applications, or for purposes of matching sensitivities of several switches in utilizing apparatus.

Abstract: This disclosure is directed to an electro-optic cell construction of the type which employs a layer of minute dipole particles in a suspension carried between two transparent sheets for use as an electro-optic light controlling device such as a shutter, or the like. In combination with the dipole particle containing fluid chamber are optically transparent piezoelectric transformer elements for causing a transverse electric field in the fluid chamber to increase the speed of response of the shutter action.

Abstract: The subject matter described is a U.V. detector of the ionization type for operation at high temperatures where it is necessary to cyclically reverse the potential applied to the sensor to prevent premature aging of the detector. In the present disclosure, the means for reversing the potential at a predetermined rate is shown as a free running oscillator multivibrator connected to switch the power supply. The novel aspect is in locking out the oscillator when U.V. is being sensed by the detector.

Abstract: Optics for a multi-track holographic tape recorder are disclosed. A multiplicity of one-dimensional page composers and passive optical means store the data in a multiple track format on a moving tape.

Abstract: Cadmium tellurite with a composition CdTeO.sub.3 is formed by reactive sputtering of a cadmium telluride target in an oxygen atmosphere.

Abstract: A photodetector is bonded to an electrically conductive substrate with an indium containing solder. An electrical insulating layer of a stable oxide which is wettable by indium provides electrical insulation between the electrically conductive substrate and the photodetector.