Abstract: A system using collinear acoustooptic interactions in optical waveguides through which waveguide mode conversion is achieved. The system involves a surface acoustic wave interaction with an optically guided wave and its operation for mode conversion.

Abstract: The adduct of phosphorous oxychloride and hexamethylphosphoramide and alkoxy derivatives thereof useful for enhancing the fire retardancy of polyesters and a method of enhancing the fire retardancy of general purpose polyester resins through the combination therewith of an alkoxy derivative of the adduct of phosphorous oxychloride and hexamethylphosphoramide.

Abstract: The adduct of phosphorous pentachloride (PCl.sub.5) and hexamethylphosphoramide ((Me.sub.2 N).sub.3 PO) and alkoxy derivatives thereof useful for enhancing the fire retardancy of polyesters and a method of enhancing the fire retardancy of general purpose polyester resins through the combination therewith of the aforedescribed alkoxy derivative.

Abstract: A laser cavity containing a mixture of nitrogen, N.sub.2, and mercury, Hg, gas is optically pumped by a lamp containing mercury to produce a laser output of 546.1 nm. The upper laser level is excited through optical pumping by a resonance lamp while the lower level which is a low lying metastable state is depopulated by collisional quenching.

Abstract: A device and method for synchronous generation and amplification of tunable UV laser radiation. The system makes use of flat plate conductors which contain first and second parallel spaced channels therein. In the first channel, a N.sub.2 discharge produces a N.sub.2 laser pulse which excites a dye cell laser that generates a narrow radiation spectrum. Optical grating dispersion elements select two tunable frequencies which produces a colinear two laser beam output. The two beam pulse is directed into a gas or vapor cell with a resonantly enhanced third order susceptibility which mixes the two frequencies and results in a vacuum ultraviolet signal. The signal from the gas or vapor cell is transmitted by a rotatable, movable mirror vacuum optical path, with variable pulse delay, to the second channel where it is injected into the discharge in the second channel at the instant that gain is available.

Abstract: A system for identifying chrysotile asbestos as well as other asbestiform bers in air pollution samples which comprises a collimated x-ray beam which is incident on parallel aligned asbestos fibers. Diffracted x-rays are detected by a proportional counter set at the diffraction line position for the (002) plane. Background intensity may be detected by a second counter set above the axis, or the sample may be rotated 90.degree. and the one detector used to detect diffracted and background x-rays.

Abstract: A composite superconductor which comprises (1) a first layer of an alloy ected from the group consisting of a vanadium-gallium (V--Ga) alloy with a gallium content from 12.5 at. % to 17.5 at. %, a niobium-tin alloy (Nb-Sn) with a tin content from 12 at. % to 17.5 at. %, and a vanadium-silicon (V--Si) alloy with a silicon content from 10.0 at. % to 20.0 at. %; (2) an intermediate layer of an A-15 compound selected from the group consisting of V.sub.3 Ga, Nb.sub.3 Sn, and V.sub.3 Si; (3) a third layer of an alloy selected from the group consisting of copper-gallium (Cu--Ga) alloy with a gallium content greater than 22 at. % but not greater than 30.0 at. %, a copper-tin (Cu-Sn) alloy with a tin content greater than 11 at. % but not greater than 21.0 at. %, and a copper-silicon (Cu--Si) alloy with a silicon content greater than 14 at. % but not greater than 21 at. %.

Abstract: A Glan-laser prism polarizer in which spaced prisms are surrounded with an index of refraction matching fluid and the gap between the prisms is also filled with the fluid.

Abstract: A device which provides rapid attenuation of incident light, the degree of ttenuation being proportional to the intensity of the light. This system can be used for eye or device protection in sunlight or other situations in which the illuminating source has a spectral output which includes radiation in the 300-400 nm spectral region. The shutter/attenuator can achieve its maximum extinction in less than 100 psec after being illuminated and returns to maximum transmission within 10 nsec after the light is extinguished.

Abstract: A small low frequency acoustic receiver which is formed into a cylinder or ing by use of a plurality of separate elements of piezoelectric material. Each element is secured with its sides in face-to-face relationship with an electrode between each joined face in contact with each adjacent element. The electrodes are alternately connected into an electrical circuitry for transmitting electrical signals to a receiver.Other construction techniques may be used to assemble separate elements in a cylindrical arrangement. Over a band of very low frequencies, the cylinder or ring has a high sensitivity (i.e., it produces a large electrical signal) to sound incident in the axial direction compared with its sensitivity in the radial direction. Over this band of very low frequencies the sensitivity of the cylinder or ring is relatively constant for sound incident in the axial direction.

Abstract: Grease compositions suitable for a salt water, high pressure and high shear nvironment over a wide temperature range which comprises from 82 to 89 weight percent of an ester-silicone oil base selected from the group consisting of a blend of isodecyl pelargonate, hexadecyl isostearate, and methyl-phenyl silicone, a blend of isodecyl pelargonate, tridecyl azelate, and methyl-phenyl silicone, and a blend of ethylhexyl adipate and methyl-phenyl silicone; from 4.9 to 7.5 weight percent of lithium stearate; from 2 to 3 weight percent of a rust inhibitor selected from the class consisting of barium and lead dinonylnaphthalene sulfonate; from 1.5 to 5 weight percent of antimony dialkylphosphorodithioate; from 0.2 to 0.6 weight percent of 2,6-di-tert-butyl-4-methylphenol and from 0.25 to 0.6 weight percent of a copper-silver corrosion inhibitor selected from the class consisting of tolyltriazol, disalicylal-propylenediamine, and 2-mercaptobenzothiazole.

Abstract: This disclosure is directed to an electrical means for input and output coupling of light in optical waveguides.

Abstract: A technique for making IFF Friend-Accept decisions based upon either receng T.sub.a correct replies in any consecutive sequence of W responses in a larger, predetermined number N of responses, or receiving a consecutive series of a predetermined number R.sub.a of correct replies. A Non-Accept indication is provided upon the occurrence of N interrogations before either T.sub.a correct replies are received in the group of W responses, or a consecutive series of R.sub.a correct replies are received. Target leading edge information is also derived from these determinations.

Abstract: Beta Glass fibers are dispersed in a solution containing hydrochloric acid nd a hydrophobic fumed silicon dioxide treated with a silane thereby forming a slurry which is subjected to a sonic probe whereafter other glass fibers are mixed into said slurry and the mixture is formed into a glass fiber filter.

Abstract: An improved system and technique for detecting and stabilizing long term thermal and mechanical drifts in a swept Fabry-Perot interferometer. Under the control of a timing circuit the distance between two interferometer optical surfaces is changed by periodically sweeping a first surface while the second surface is rocked in a positive and negative direction about two orthogonal axes. The light transmitted by the inerferometer is detected to provide a train of uniform pulses of random spacing having a maximum count when the surfaces are substantially parallel. A counter circuit senses the number of pulses during rocking in both the positive and negative direction about each axis and provides each count to a summing circuit for providing a difference output.

Abstract: An improved system and technique for reducing interference in signal receng systems, particularly in sidelobe canceller systems. Adaptive canceller loops receive inputs from an auxiliary channel signal and operate on a main channel signal to reduce interference in the main channel signal. The auxiliary channel signal is supplied through a quadrature hybrid circuit to provide I and Q components to the adaptive loops, which loops are connected in series and cascaded such as to form a plurality of serially connected I and Q loops.

Abstract: A technique for testing decision-making devices of the Yes-No, or friend ept type in order to determine their operating performance characteristics. Binary information having predetermined characteristics is applied to a device under test, and response by the device observed.

Abstract: A method of coprecipitating a mixed oxalate to be used as a laser material in which one of the reactants is introduced as droplets formed by an aerosol into a bath containing the second reactant.

Abstract: A gas dissociation solar thermal power system in which SO.sub.3 in a solar furnace is heated by a sun ray reflector. The SO.sub.3 dissociates into SO.sub.2 + O.sub.2 + absorption of heat. The SO.sub.2 + O.sub.2 gas is directed through a salt-heat chamber where it recombines into SO.sub.3 and gives off heat. The SO.sub.3 is directed back to the solar furnace and repeats the cycle. Useful heat is taken from the salt-heat chamber for operation of an electrical generator or other desired equipment.

Abstract: An improved technique for forming an electron emitting cathode of iridium d similar noble metals. A mixture of powders including a matrix material of one of the noble metals and a pore forming material of silver is shaped into a cathode configuration and sintered at a temperature sufficient to evaporate the silver, thereby producing a porous matrix. The matrix is impregnated with an active material and dried to produce a cathode having increased electron emission characteristics allowing operation at lower temperatures for longer time periods.