Abstract: A high pressure furnace and reusable demountable containment means for setive in situ information of epitaxial layers on a semiconductor substrate while under gas overpressure. The containment means has vent means therein for allowing the inert and reducing or reactive gases in an inner chamber of the furnace to enter into the interior of the containment means to equalize pressures on each side of the housing and to semi-confine the vapor from the epitaxial growth source materials in the interior of the containment means. The containment means has a removable, i.e. demountable, form-fittedly sealed plug which is removed to insert the substrate and growth source elements, which are mounted in a close-space relationship on a support structure, therein. The support structure is inserted back into the containment means and the plug is form fittedly sealed thereto for performing the epitaxial layering.

Abstract: A cam activated electrical switching means for an elastic multicircuit printed circuit board (PCB). A plurality of PCB reeds with disattached portions at one end nearest the edge of the PCB are cut out in the generally central portion of the PCB, and an electrical board, positioned adjacent to but separated from the PCB, made of elastic PCB-type material has the same number of plurality of flexible reeds cutout therefrom in its central portion. The PCB reeds and electrical board flexible reeds have electrical leads etched on the back sides thereof with the PCB reeds having an electrical contact pin on the front of the disattached end portion facing the etched electrical lead on the back of the disattached end of the flexible reed. An embossed mechanical rider is positioned on the front of the disattached end of the flexible reeds. The electrical etched lead on the back of the flexible reed may be connected to some electrical source on the electrical board.

Abstract: A recirculating optical/electronic closed loop feedback process and appars in which nanosecond light pulses are triggered by a pulse generator upon arrival of previous signals that have just completed a round trip through the closed loop feedback system. The optical path is comprised of a light source and a detector between which is mounted beam forming optics that guide the light beam from the light source through a transparent vessel having a semitransparent medium therein whose refractive index and/or transparencies are measured. The electronic portion is comprised of a pulse amplifier for amplifying the detected light beam that in turn is repetitively applied to a high rate pulse generator to retrigger the light source through a pulse counter that records the number of signal circulations which pass through the closed loop during a given time to indicate the change of transmissivity of said medium.

Abstract: A series of highly-reflective contiguous conical segments about an optic s. The length of each segment side and the cone vertex angle of each cone is related to the overall desired size of the reflector, and the desired angle of radiation from the reflector.

Abstract: The disclosure is a dual controlled linear resonance cryogenic cooler and comprised of a remote cold finger and a compressor, both driven by linear motors. A motor control means is used with the linear motors to drive both motors with a phase delay of the cold finger motor from that of the compressor motor such that the compressor linear motor alternately drives a piston to produce alternating pressure waves in a light cooling gas in working relation with a regenerator-displacer in the remote cold finger and the cold finger linear motor has a delayed phase relationship with the compressor linear motor. The use of linear motors which are slightly out of phase with each other selectively provides flat top and bottom dead center with constant linear increases and decreases therebetween for the compressor piston to follow and to eliminate the normal side forces of the piston that cause excessive wear.

Abstract: An improved prism which polarizes and retroreflects a light beam which is incident thereto at the Brewster's angle. The principles of the Brewster window, corner reflector, and total internal reflection, such as at the ends of a laser cavity, is incorporated into a single optical device. When correctly polarized light, with respect to the Brewster angle entrance to the prism, strikes the specially shaped right angle prism at the Brewster's angle, the light will be retroreflected straight back paralled to the incoming beam without significant losses.

Abstract: A night sight assembly in conjunction with a day sight which is easily cocted and disconnected in total darkness to small defense weapons systems. The assembly is comprised of an infrared viewer amounted on a cradle which is easily connected and disconnected to a small weapon system.

Abstract: A method of forming a variable sensitivity transmission mode negative eleon affinity (NEA) photocathode in which the sensitivity of the photocathode to white or monochromatic light can be varied by varying the backsurface recombination velocity of the photoemitting material with an electric field. The basic structure of the photocathode is comprised of a Group III-V element photoemitter on a larger bandgap Group III-V element window substrate.

Abstract: A method of forming a high sensitivity, large area, negative electron affty (NEA), infrared sensitive transmission mode, GaAs on AlGaAs photocathode structure with the GaAs layer being of controlled homogeneous thickness and having a blemish-free surface. The structure is formed by using a combination of liquid and vapor phase epitaxial techniques, i.e., hybrid epitaxy.

Abstract: A fluidic bearing seal assembly comprised of a plurality of floating back ring seals positioned in a plurality of annular grooves in a piston with at least one free-floating sealing wedge fitted to the outer peripheral edge of each backing ring for sliding along the cylinder wall. The piston has an inlet port and one way check valve means in the head thereof through which the working fluid is compressed during the compression stroke into a plurality of passageways that route the working fluid under pressure against said plurality of floating backing ring seals and into a pressure reservoir directly in contact with the cylinder wall and between adjacent backing ring seals to press the backing ring seals and seal wedges against the cylinder wall during the compression stroke and release the pressure from the ring seals and wedges during the return stroke of the piston.

Abstract: A generally semicircular device is disclosed which is capable of holding an djusting knob or wheel stationary with respect to a flange. The device is in the form of a hollow arch with flat parallel walls joined by a curved wall. A cam lever is pivoted in an opening in one of the flat walls such that the cam bears against the knob for one position of the lever and pushes the knob and flange towards each other.

Abstract: A boresight collimator usable with three different night-vision (infrared) ights for the U.S. Army TOW missile. These sights must be boresighted to the visible light (day) sight already on the missile launcher, but each night sight is differently mounted. The collimator has a readily adjustable bracket for attaching to the night sights and for allowing both the visible and infrared collimating images to be seen in their respective sights.

Abstract: A substrate of a dimensionally-stable material is formed with precision m cavities therein for various linear or nonlinear optical elements or electro-optical elements such as lenses, beam splitters, reflectors, detectors, polarizers, Kerr cells, Pockel cells, etc. Various openings are also made in the substrate for function as optical paths or waveguides. The elements are then bonded into their respective cavities by glueing or soldering; the optical system thus formed is sealed in an air-tight housing.

Abstract: A ternary or more complex semiconductor alloy is treated to form simultansly a junction beneath its surface and to passivate the same surface. The treatment consists of connecting the semiconductor to one electrode of an electrolytic circuit, immersing it in an electrolyte which may contain a leachant, and energizing between electrolytic circuit electrodes with a substantially square electric current wave with a direct current average value. After a predetermined time, the semiconductor is removed from the electrolyte, is disconnected from the electrolyte, and is washed, rinsed, and dried. During the process the electric current causes ions of the semiconductor to migrate toward its surface, where they enter the electrolyte. This depletion of ions effectively forms a junction; the current also causes oxidation of the semiconductor surface for passivation.

Abstract: An array of semiconductive photoconductor detectors is formed on a substr with which the array forms a heterojunction. The array has a whole or partial overlayer of the same material as the substrate. Ohmic connections are made on the detectors and conductive read-out leads are connected to these connections; the leads are made of a conductor that forms a Schottky barrier with the substrate and overlayer. Ohmic connections are made to the substrate and overlayer such that a voltage bias may be applied between the substrate-overlayer combination and the array. The bais is used to control the accumulation layer in the substrate beneath the array in order to maximize sesitivity.

Abstract: A test image projector operating in the ultraviolet through infrared specm that is comprised of two symmetrically mounted identical mirrors which are off-axis sections of an astronomical quality parabola. The first mirror produces collimated beams from object points and reflects these collimated beams onto the second mirror while the second mirror refocuses the collimated beams into diffraction limited image points, and thus provides a diffraction limited test image. The test image is used to check the quality of optical and electrooptical systems.

Abstract: An infrared detector array and its associated conductors on a substrate are overed with an insulating antireflection layer. In one embodiment, a thin metal layer is sputtered or evaporated on this layer and the metal is masked and etched to uncover desired portions of the insulating layer over the detectors and the conductors. The mask is removed and a thick metal layer is electroplated onto the thin metal layer. An alternate embodiment applies the thick metal layer on an unetched thin metal layer, and both layers are etched through a mask to uncover the desired portions of the insulating layer. The mask is stripped and the final steps (both embodiments) include masking and etching to remove the non-metallized insulating layer on the conductors.

Abstract: Passivation of a mercury cadmium telluride surface is done by using square ave direct current, with the positive portion of the wave larger than the negative part.

Abstract: A mercury-cadmium-telluride (HgCdTe) epitaxial detector array is formed on a cadmium telluride (CdTe) substrate. Connecting leads to the detectors are a molybdenum layer covered by a gold-germanium layer. These leads have excellent matches for the thermal coefficients of expansion of the HgCdTe and CdTe and provide ohmic contacts such that the D* of the array is greater than that of arrays made by prior processes using known lead materials, and the noise level is reduced by a factor of approximately three.

Abstract: The growth of mercury cadmium telluride (Hg.sub.(1-x) Cd.sub.x Te) alloys carried out by the pyrolytic decomposition of a mixture of Cd and Te alkyls in an atmosphere of Hg vapor; the ternary alloy is deposited as an epitaxial film on a CdTe single crystal substrate. The substrate is carried on a heated susceptor in a reactor vessel. The susceptor also has a cavity in which mercury is heated (at a temperature different from the substrate temperature) to provide Hg vapor. A mixture of dimethyl cadmium and diethyl tellurium gases flows through the reactor, the gases thermally decompose in the vicinity of the substrate, and combine with the Hg vapor to form Hg.sub.(1-x) Cd.sub.x Te on the substrate. The relative proportions of dimethyl cadmium and diethyl tellurium determine x in the compound.